Office of Operations Freight Management and Operations

Report No. S1
Farm-based National Totals

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1. Definition of the Commodity Flow Data Gap

1.1. General Description

The 2002 Commodity Flow Survey (CFS) collects data from business establishments with paid employees that are located in the United States. These establishments are classified using the North American Industrial Classification System (NAICS). In terms of agricultural products, the CFS includes shipments from food manufacturing, beverage and tobacco product manufacturing, as well as wholesale trades. However, due to its sampling frame design, the CFS does not capture farm-based agricultural shipments that occur prior to the storage elevators (e.g., grain) or distribution/processing centers (e.g., fruit, livestock). Note that agricultural shipments outbound from these storage elevators and processing centers are captured by the CFS.

Based on prior CFS surveys and reports, farm-based agricultural shipments are known to be one of the most significant out-of-scope areas excluded from the CFS data collection effort.

1.2. Commodities involved in the data gap

In 1993, the U.S. Bureau of Census used the Standard Transportation Commodity Codes (STCC) as its commodity classification system for the CFS. The STCC has evolved since the 1960s and is used primarily for analyses involving the railroad industry. Realizing the limitations in the STCC system, as well as seeking to provide better detail of commodities not typically carried by rail and better comparability with the Harmonized System (HS) used worldwide for international trade, statistics agencies in the United States and Canada jointly developed the Standard Classification of Transported Goods (SCTG). Since 1997, the CFS has used the SCTG system for its commodity reporting.

Commodities involved in the CFS 2002 data gap for farm-based agricultural shipments are briefly discussed in the following sections.

1.2.1. SCTG codes

Three major 2-digit-SCTG codes are most likely to be impacted by this CFS data gap. They are:

01 Live animals and live fish
02 Cereal grains (including seed)
03 Other agricultural products (except for animal feed)

While the shipment of commodity code 04 – animal feed and products of animal origin – is also a part of agricultural transportation activities, it is assumed that shipments of this type are captured within the CFS because of processing requirements (e.g., not harvested or raised at a farm).

1.2.2. STCC codes

Under the STCC system, commodity groups that are impacted by this CFS data gap are:

01 Farm products
09 Fresh fish or other marine products

1.3. Establishments involved in the data gap

As mentioned above, CFS collects data from business establishments in the United States. Beginning in 2002, establishments were sorted into industry sectors using the NAICS. The Standard Industrial Classification (SIC) system was used in the 1993 and 1997 CFS. Because farms are excluded from the CFS survey frame, farm-based agricultural shipments are out-of-scope for the CFS under both SIC and NAICS classification systems. Specifically for this data gap, the missing shipments are agricultural products that are shipped from a farm site to the first point of processing or storage, i.e. processing center or terminal elevator. As stated previously, CFS does cover the shipments of these products from the initial processing centers or terminal elevators onward (e.g. to the market or for exports).

1.3.1. NAICS codes

Establishments classified under the entire NAICS code 11 (i.e., Agriculture, Forestry, Fishing and Hunting) were not included in the CFS survey-sampling frame. A detailed listing of these establishments under the 2002 NAICS definitions can be found at the Census website: http://www.census.gov/epcd/naics02/naicod02.htm.

Specifically, the farm-based agricultural shipments impact the following 3-digit NAICS codes that relate to the out-of-scope shipments discussed in this report:

111 Crop Production
112 Animal Production
115 Support Activities for Agriculture and Forestry (e.g., crop harvesting)

1.3.2. NAICS-SIC conversion issues

The conversion from SIC to NAICS does not impact this data gap. Farms were excluded under both SIC and NAICS definitions of industry sectors.

2. Importance of the Data Gap

2.1. Value and tonnage as a share of national shipments

Based on a similar CFS-related study, total tonnage from farm-based agricultural shipments was estimated at over 1 billion tons in 1997. This accounted for over 7% of the estimated total national tonnages being moved in the United States during 1997. Similarly, its total value was estimated at approximately $197 billion, which accounted for over 2% of the national total in the same year. Along with shipments made by foreign establishments (i.e., imports) and crude petroleum, farm-based agriculture is one of the three most significant missing components for the CFS in terms of tons.

Although statistics on total freight activities in the United States for 2002 will not be produced until estimates on all CFS data gaps are completed, a similar level of importance (as in 1997) can be expected. Preliminary estimates for this CFS-out-of-scope component indicate that a total of 1,051 million tons, with value of approximately $201 billion, were shipped from farm to their first point of storage or processing locations in 2002. To put this in perspective, the national total of freight shipments captured by the 2002 CFS is 11,668 million tons and valued at over $8,397 billion. That is, the estimated amount for farm-based agricultural shipments is about 9 percent in weight, and about 2 percent in value, of what CFS has captured in 2002.

2.2. Value and tonnage as a share for individual modes

Since most farm-based agricultural shipments of concern are likely to be local activities, it is reasonable to assume all farm-based agricultural shipments are transported by truck. Under this assumption, the estimated tonnage for this out-of-scope component (i.e. 1,051 million tons) is about 13 percent of the CFS-captured truck shipment tonnages (totaled at about 7,843 million tons). Similarly, when comparing in dollar values, the amount from this data gap (i.e. $201 million) is at the level of approximately 3 percent of total CFS truck freight (about $6,235 billion).

A more detailed discussion on this mode-of-transportation assumption is provided in the next section.

2.3. Geographic concentration: dispersed versus concentrated, local versus long distance

According to the finding of a 2001 survey conducted by the Upper Great Plains Transportation Institute (UGPTI) with assistance from nine state elevator organizations (including Colorado, Kansas, Minnesota, Montana, Nebraska, North Dakota, Oklahoma, South Dakota, and Texas), on average, grain elevators purchase about 72% of the grain they handle from a draw area within a radius of 29 miles or less around the elevator.1 Regarding equipment employed for inbound grain deliveries (i.e. from farm site to elevator), the study also found that the majority of the grain delivered to elevators responding to this survey arrived via semi-truck and trailer. In fact, this survey found that only about 2 percent of inbound grain deliveries were delivered via equipment other than single-axle, tandem-axle, tri-axle, or semi-tractor and trailer.

Although the UGPTI grain elevator study only considered a limited type of farm-based agricultural shipments (corn, wheat, and soybeans) in 9 states, the findings confirmed the assumptions used by ORNL in estimating farm-based shipments.2 They are (1) most farm-based agricultural shipments are local activities and (2) most of these shipments are transported by truck.

Based on information derived from the Vehicle Inventory and Use Survey (VIUS) 2002 data, of all truck operators indicating agricultural-related products as their “principal products carried,” over 90 percent reported that they primarily operated within their home base state3 during 2002. Four major agricultural products are included in the VIUS; they are: live animals and fish, animal feed, grains, and other agricultural products. The percentages of “operating mostly within home base state” varied slightly, ranging from 90% to 95%, when the four major agricultural product groups are analyzed separately. Nevertheless, this reconfirms that almost all farm-based agricultural shipment activities are local.

Furthermore, depending on the commodity type, the geographic concentration of these farm-based agricultural freight activities could either be dispersed or concentrated. For example, only 4 states (CA, FL, TX, and AZ) harvest oranges, but many more states grow apples. However, at the 2-digit SCTG level (e.g. oranges and apples are both included under SCTG 03) the geographic concentration of farm-based agricultural shipments is expected to be more dispersed.

2.4. Importance to international trade

As discussed previously, this CFS data gap covers shipments originating from a U.S. farm site to the first point of storage or processing location. For this reason, this data gap has no bearing on international imports. On the other hand, some of these farm-based agricultural shipments could eventually be shipped overseas or across the border to Canada or Mexico. Direct exports by farmers are possible but are expected to be quite small. Therefore, this data gap is assumed to have very little impact on exported international trade.

Furthermore, since most of these farm-based shipments are captured by the CFS at their first points of storage or processing centers, which are likely to be in-scope for the CFS, shipments intended for foreign destinations will most likely have been reported as exports by those shippers. Aside from the fact that CFS undercounts exports, the direct impact from farm-based agricultural shipments on international trade (i.e., tons and value exported) is likely to be small. In other words, to avoid double counting, the farm-based agricultural shipments (movements inbound to storage elevators or processing centers) should be considered as domestic shipments only.

3. Data Sources

3.1. Coverage in CFS

Farm-based agricultural shipments are an out-of-scope data gap of the CFS. None of this type of shipment is captured by the CFS.

3.2. Coverage in other data sources

The main data sources used in filling this farm-based agricultural shipment data gap were: the 2002 Census of Agriculture and the 2004 Agricultural Statistics; both are published by the U.S. Department of Agriculture (USDA).

2002 Census of Agriculture

The Census of Agriculture is a census conducted every five years by the USDA. It is the leading source of facts and statistics about U.S. agricultural production. The Census of Agriculture provides statistical information at the national, state, and county (or county equivalent) levels. All agricultural production establishments (e.g., farms, ranches, nurseries, greenhouses, etc.) are included. The latest available data from the Agriculture Census is 2002.

Agricultural Statistics 2004

Agricultural Statistics is an annual publication prepared by the National Agricultural Statistics Service (NASS) of the USDA. It provides information on agricultural production, supplies, consumption, facilities, costs, and returns. Weights, measures, and conversion factors are published in this reference book. The latest publication is 2004 Agricultural Statistics, which includes preliminary estimates for 2002 and projection estimates for 2003.

With the above USDA data, tonnage and dollar value of farm-based agricultural shipments can be estimated. Ton-mile estimates, on the other hand, required the use of an additional data source and assumptions. Several pieces of information from the 2002 VIUS were used to derive the ton-mile estimates needed for this study.

2002 VIUS

As a part of the Economic Census, the Bureau of Census collects information on the physical and operational characteristics of the private and commercial truck population in the United States. The VIUS survey is conducted in the same year as the CFS (also a part of the Economic Census). The latest data is for 2002, which was released recently on CD-ROM.

3.3. Data quality

The main source of data used in estimating ton and value for this data gap are from the USDA Agriculture Census. Because this is a Census, it is not subject to sampling errors. Non-sampling errors might exist, but should be relatively small. Shipment mileage was estimated using VIUS data from the U.S. Census along with some simple assumptions (e.g. truck, local). The national estimates of tons, value, and ton-mile are expected to be relatively reliable. However, estimates at the sub-state geography level (which will be needed for regional level estimates) may be subject to a higher degree of uncertainty, particularly the ton-mile estimates.

3.4. Other issues

The assumptions used in estimating ton-miles require information on the location in which the truck operates. Due to the lack of better data, the VIUS home base state was assumed to be the operating-state for the purpose of estimating average trip length.

Another possible issue is whether “shipments” from feedlots and stockyards to processing facilities are captured under this study. The concern is that, rather than a single leg from the farm to the first point-processing center as discussed earlier, some live stock shipments may involve a 2-legged operations (e.g. from farm to feedlot and from feedlot to slaughter house).

Based on information obtained from the Livestock Division of the NASS/USDA4, farmers may “place” cattle or calves on feedlots for later sale but rarely “sell” them to feedlots. USDA surveys include all types of farms5, ranging from family-owned small farms to large corporations and cooperative owned farms. Specifically, to avoid possible double counting, large corporations are asked to report only livestock that are raised by the company and not those purchased from farmers. The sale of cattle and calves reported in the Census of Agriculture, therefore, includes those raised and sold by farmers (either directly to market/slaughter houses, or by placing them in a feedlot and sold later to markets/slaughter houses) and those raised and sold by corporations.

Therefore, further investigation regarding this feedlot and stockyard issue is not recommended.

4. Estimation Methods

4.1. General description of estimation method

The dollar value of this out-of-scope data gap can be estimated directly with information obtained from the 2002 Census of Agriculture publication. Specifically, data provided under the category of “Market value of agricultural products sold”6 was used as an estimate for total farm-based agricultural shipments. The estimation of tonnages for these out-of-scope shipments is not as straightforward, however.

Statistics in the 2002 Census of Agriculture as published by the USDA are typically in different units of measurement (e.g., pounds, bushels, hundredweight, barrels, tons, etc). Therefore, unit conversions are necessary. This conversion is not a trivial matter. In many cases, different conversion factors are needed for different commodities even though the “same” unit is used. For example, the approximate net weight for a bushel of wheat is 60 pounds, while a bushel of corn is 70 pounds for husked corn on the ear, and 56 pounds for shelled corn. All conversion factors used in this study are based on information obtained from Agriculture Statistics 2004.

Once all data are converted into the same unit of measurement (i.e. pounds), estimates of the total shipment tonnages are computed based on its 2-digit SCTG categories. Note that the USDA does not use the SCTG code for its commodity categorization. All data on farm-based agricultural commodities extracted for the purpose of this study (see Appendix of this report) are regrouped into SCTG categories, to the extent that is possible and reasonable.

4.2. Method for estimating national totals

The estimates of national total value and tonnage for farm-based agricultural shipments can be obtained using the method described above. The results are presented in Table 1 below. Itemized farm-based agricultural products included in the national totals are provided in the Appendix of this report.

Table 1: National Total for Farm-based Agricultural Shipments in 2002
SCTGCommodity DescriptionWeight (thousand ton)Value ($ million)
1Live animal and live fish90,929$105,494
2Cereal grains795,382$39,958
3Other agricultural products164,974$55,194
Total1,051,285$200,646

In order to estimate ton-miles for farm-based agricultural shipments, information on the length of movement for these shipments (or haul length) is needed. Since this mileage information is not readily available, it has to be estimated. In general, trip distance would vary depending on the type of commodities, where the product is harvested or raised, where the processing center or storage facility is located, and how it is shipped. Estimating haul distances at this level of detail would be cumbersome.

As mentioned previously, VIUS is the main source of data used in this study for estimating shipment mileages. VIUS micro data furnished information on the typical area of operation of trucks carrying agricultural products. This information is given in categories such as: off-the-road; 50 miles or less; 51 to 100 miles; 101 to 200 miles; 201 to 500 miles; 501 miles or more; not reported; and not applicable (vehicle not in use). Because the primary interest of the Freight Analysis Framework (FAF)7 is on those utilizing the national transportation systems, off-road activities are not included in this study. Furthermore, with the exception of the State of Alaska and possibly Texas, the within-state operating range for all other states in the United States should all be within 500 miles. Therefore, the category of “501 miles or more” is also eliminated from this study. Using mid-points of the remaining range categories and the distribution of operating ranges, a weighted average trip length is estimated for each of the three SCTG commodity-carrying truck groups (i.e. principal product carried). These national weighed-average lengths of haul estimates are shown in Table 2.

Table 2: Estimated length of haul at national level
SCTGAverage length of trip
01 – Live animal & live fish55.5 miles
02 – Cereal grains35.7 miles
03 – Other agricultural products41.1 miles
All agriculture combined44.0 miles

A brief discussion of a similar average trip-length estimation procedure, at the state level, can be found in a 1998 Journal of Transportation and Statistics article8. Applying tonnage estimates as shown in Table 1 to trip length estimates presented in Table 2, the preliminary total national ton-miles can then be estimates (see Table 3).

Table 3: Preliminary ton-mile estimates for farm-based agricultural shipments in 2002
SCTGTon-miles (million)
01 – Live animal & live fish5,047
02 – Cereal grains28,395
03 – Other agricultural products6,780
Total farm-based agricultural shipments40,222

Note that these preliminary ton-mile estimates (as shown in Table 3) will be refined once regional flows are determined. It is expected that regional flow assignments will provide a more realistic mileage estimate for these shipments. Summing all ton-miles estimated for the sub-state geographic regions should then generate the estimate of national total ton-miles.

4.3. Proposed method for estimating regional flows

Please refer to Report No. 5 Methodology for FAF Regionalization of Selected Out-of-Scope Truck Commodity Flows.

4.4. Expected quality of the estimates

Estimates of tons and value are directly computed based on data obtained from the USDA. The expected quality of these estimates is therefore as good as those of the original USDA data. Estimates of ton-miles, however, require the use of VIUS data and assumptions. As pointed out previously, VIUS data have limitations on geographic details, sample coverage, and are subjected to other sampling errors. Mileage estimates produced from this process, therefore, have a higher degree of uncertainly. Consequently, ton-mile estimates for this data gap may be less accurate than those for tons and value.

5. Implications for the Scope and Content of the 2007 CFS

Unless the CFS sample frame is changed to include farms, farm-based agricultural shipments will continue to be a missing component for the 2007 CFS. Because data from the USDA provide reliable and sufficient information (ton and value) to supplement CFS for this specific data gap, it is not necessary for the 2007 CFS to change its sample frame to include farms. Although VIUS-based mileage estimates seem reasonable, it may be beneficial to conduct small-scale surveys to gather information on farm-based shipment distances, especially for SCTG categories 01 (live animal and live fish) and 03 (other agricultural products).

6. Other Issues

None.

7. References

Vachal, Kimberly and Denver Tolliver, Regional Elevator Survey: Grain Transportation and Industry Trends for Great Plains Elevators, Upper Great Plains Transportation Institute, North Dakota State University, August, 2001.

Chin, S. M., J. Hopson, and H. L. Hwang, “Estimating State-Level Truck Activities in America,” Journal of Transportation And Statistics, Volume I, No. 1, pp 63-74, January, 1998.

2002 Vehicle Inventory and Use Survey, Form TC-9502, U.S. Bureau of Census.

2002 Census of Agriculture, Volume 1, Geographic Area Series, Part 51, AC-02-A-51, National Agricultural Statistics Service, USDA, June 2004.

Appendix: Itemized Weight Estimates
Item description Total units Pound per unit Total weight (ton)
Live animal & live fish
Calves sold (number)
14,134,1473352,367,470
Live animal & live fish
Cattle sold (number)
59,375,0181,17734,942,198
Live animal & live fish
Hogs and pigs sold (number)
184,997,68625623,679,704
Live animal & live fish
Any poultry sold, layers 20 weeks old and older sold
202,947,4905507,990
Live animal & live fish
Any poultry sold, pullet chicks
174,916,7015420,649
Live animal & live fish
Any poultry sold, broilers
8,500,313,357520,550,900
Live animal & live fish
Any poultry sold, turkeys sold (number)
283,247,649243,396,638
Live animal & live fish
Sheep and lambs sold (number)
5,426,904133360,889
Live animal & live fish
Horses and ponies, sales (number)
470,4231,050246,972
Live animal & live fish
Mink and their pelts, sales (number)
2,506,8191627
Live animal & live fish
Ducks, sales (number)
24,143,066672,429
Live animal & live fish
Geese, sales (number)
200,564151,504
Live animal & live fish
Pigeons or squab, sales (number)
1,160,3641290
Live animal & live fish
Pheasants, sales (number)
7,206,460414,413
Live animal & live fish
Quail, sales (number)
19,157,803219,158
Live animal & live fish
Other poultry, sales (number)
3,143,26446,287
Live animal & live fish
Poultry hatched, sales (number)
10,186,919,78313,820,095
Live animal & live fish
Mules, burros, and donkeys - sales (number)
17,3855504,781
Live animal & live fish
Goats, total sales (number)
1,314,31015098,573
Live animal & live fish
Rabbits and their pelts -sales (number)
886,84183,547
Live animal & live fish
Catfish, pounds (1,000)
608,9251,000304,463
Live animal & live fish
Trout, pounds (1,000)
40,3841,00020,192
Live animal & live fish
Hybrid Striped Bass, pounds (1,000)
1,0000
Live animal & live fish
Other fish, pounds (1,000)
72,6701,00036,335
Live animal & live fish
Crawfish, clam, mussels, oysters, snails, pounds (1,000)
73,6031,00036,802
Live animal & live fish
Other aquaculture products, pounds (1,000)
33,0121,00016,506
Cereal grains (including seeds)
Corn for grain or seed (bushels), harvested
8,613,061,81470301,457,163
Cereal grains (including seeds)
Sorghum for grain or seed (bushels), harvested
333,485,523569,337,595
Cereal grains (including seeds)
Wheat for grain, total (bushels), harvested
1,577,005,1406047,310,154
Cereal grains (including seeds)
Barley for grain (bushels), harvested
214,800,035485,155,201
Cereal grains (including seeds)
Buckwheat (bushels), harvested
960,5894823,054
Cereal grains (including seeds)
Canola and other rapeseed (pounds), harvested
10
Cereal grains (including seeds)
Canola (pounds), harvested
1,446,267,1201723,134
Cereal grains (including seeds)
Other rapeseed (pounds), harvested
1,084,1701542
Cereal grains (including seeds)
Emmer and spelt (bushels), harvested
896,2034017,924
Cereal grains (including seeds)
Flaxseed (bushels), harvested
10,738,43456300,676
Cereal grains (including seeds)
Mustard seed (pounds), harvested
94,395,859147,198
Cereal grains (including seeds)
Oats for grain (bushels), harvested
109,840,449321,757,447
Cereal grains (including seeds)
Popcorn (pounds, shelled), harvested
945,158,9861472,579
Cereal grains (including seeds)
Proso millet (bushels), harvested
3,810,98654102,897
Cereal grains (including seeds)
Rice (hundredweight), harvested
210,358,01410010,517,901
Cereal grains (including seeds)
Rye for grain (bushels), harvested
7,253,11856203,087
Cereal grains (including seeds)
Safflower (pounds), harvested
270,105,0541135,053
Cereal grains (including seeds)
Sunflower seed (pounds), harvested
2,042,510,24011,021,255
Cereal grains (including seeds)
Triticale (bushels), harvested
890,6905624,939
Cereal grains (including seeds)
Wild rice (cwt), harvested
285,59410014,280
Cereal grains (including seeds)
Cotton (bales), harvested
17,145,3454804,114,883
Cereal grains (including seeds)
Tobacco (pounds), harvested
873,350,4121436,675
Cereal grains (including seeds)
Soybeans for beans (bushels), harvested
2,707,719,2166081,231,576
Cereal grains (including seeds)
Dry edible beans, excluding dry limas (hundredweight)
29,687,4751001,484,374
Cereal grains (including seeds)
Dry limas beans (hundredweight), harvested
1,072,85910053,643
Cereal grains (including seeds)
Dry edible peas (hundredweight), harvested
4,780,492100239,025
Cereal grains (including seeds)
Dry cowpeas and dry southern peas (bushels), harvested
236,666607,100
Cereal grains (including seeds)
Lentils (hundredweight), harvested
2,448,940100122,447
Cereal grains (including seeds)
Potatoes, excluding sweet potatoes (hundredweight), harvested
451,405,82310022,570,291
Cereal grains (including seeds)
Sweet potatoes (hundredweight), harvested
13,651,312100682,566
Cereal grains (including seeds)
Sugar beets for seed (pounds), harvested
9,542,59314,771
Cereal grains (including seeds)
Sugar beets for sugar (tons), harvested
27,793,1262,00027,793,126
Cereal grains (including seeds)
Sugarcane for seed (tons), harvested
1,726,1982,0001,726,198
Cereal grains (including seeds)
Sugarcane for sugar (tons), harvested
35,319,7672,00035,319,767
Cereal grains (including seeds)
Peanuts for nuts (pounds), harvested
3,137,586,78111,568,793
Cereal grains (including seeds)
Alfalfa seed (pounds), harvested
58,020,460129,010
Cereal grains (including seeds)
Austrian winter peas (hundredweight), harvested
207,9151104
Cereal grains (including seeds)
Bahia grass seed (pounds), harvested
2,274,51911,137
Cereal grains (including seeds)
Bentgrass seed (pounds), harvested
4,634,28912,317
Cereal grains (including seeds)
Bermuda grass seed (pounds), harvested
16,757,21518,379
Cereal grains (including seeds)
Birdsfoot trefoil seed (pounds), harvested
418,3431209
Cereal grains (including seeds)
Bromegrass seed (pounds), harvested
5,000,21512,500
Cereal grains (including seeds)
Crimson clover seed (pounds), harvested
2,002,56911,001
Cereal grains (including seeds)
Fescue seed (pounds), harvested
323,023,4981161,512
Cereal grains (including seeds)
Foxtail millet seed (pounds), harvested
910,1251455
Cereal grains (including seeds)
Kentucky Bluegrass seed (pounds), harvested
76,414,727138,207
Cereal grains (including seeds)
Ladino clover seed (pounds), harvested
938,5101469
Cereal grains (including seeds)
Lespedeza seed (pounds), harvested
5,413,44012,707
Cereal grains (including seeds)
Orchardgrass seed (pounds), harvested
18,660,98619,330
Cereal grains (including seeds)
Red clover seed (pounds), harvested
9,284,59114,642
Cereal grains (including seeds)
Redtop seed (pounds), harvested
97,292149
Cereal grains (including seeds)
Ryegrass seed (pounds), harvested
459,929,0901229,965
Cereal grains (including seeds)
Sudangrass seed (pounds), harvested
10,476,79615,238
Cereal grains (including seeds)
Sweetclover seed (pounds), harvested
30,700115
Cereal grains (including seeds)
Timothy seed (pounds), harvested
4,310,82612,155
Cereal grains (including seeds)
Vetch seed (pounds), harvested
956,2721478
Cereal grains (including seeds)
Wheatgrass seed (pounds), harvested
3,268,25611,634
Cereal grains (including seeds)
White clover seed (pounds), harvested
1,149,7761575
Cereal grains (including seeds)
Other seeds (pounds), harvested
11,582,28815,791
Cereal grains (including seeds)
Hay-alfal, other tame, small grain, wild, grass silage grass (tons)
137,858,8902,000137,858,890
Cereal grains (including seeds)
Corn for silage or green chop (tons, green), harvested
97,132,7382,00097,132,738
Cereal grains (including seeds)
Sorghum for silage or green chop (tons, green), harvested
3,904,8342,0003,904,834
Other agricultural products
Vegetables harvested, harvested (acres)
3,698,74423,25143,000,242
Other agricultural products
Fruits Total Production in 1,000 tons
33,4562,000,00033,456,000
Other agricultural products
Dill for oil (pounds), harvested
117,271159
Other agricultural products
Ginger root (pounds), harvested
5,330,28412,665
Other agricultural products
Ginseng (pounds), harvested
963,7681482
Other agricultural products
Guar (pounds), harvested
13,963,53316,982
Other agricultural products
Sesame (pounds)
1,358,3641679
Other agricultural products
Herbs, dried (pounds), harvested
3,473,23211,737
Other agricultural products
Hops (pounds), harvested
58,575,519129,288
Other agricultural products
Jojoba harvested (pounds), harvested
88,578144
Other agricultural products
Mint for oil (pounds of oil), harvested
9,919,64114,960
Other agricultural products
Mungbeans for beans (pounds), harvested
973,1661487
Other agricultural products
Pineapples harvested (tons), harvested
314,6262,000314,626
Other agricultural products
Salt hay (tons), harvested
1,3962,0001,396
Other agricultural products
Sorghum for syrup (pounds), harvested
1,125,2011563
Other agricultural products
Sweet corn for seed (pounds), harvested
9,065,45114,533
Other agricultural products
Taro (pounds), harvested
4,564,49412,282
Other agricultural products
Sweet rice (cwt) harvested
1,057,87510052,894
Other agricultural products
Sheep and lambs shorn (pounds of wool)
39,798,847119,899
Other agricultural products
Honey, sales (pounds)
134,551,490167,276
Other agricultural products
Milk and milk fat (million pounds)
176,0121,000,00088,006,000
Other agricultural products
Mohair, sales (pounds)
2,416,37611,208
TOTAL Tons1,051,285,368

1 See http://www.ndsu.edu/ndsu/ugpti/DPpdf/DP143.pdf.
2 A personal communication with Kimberly Vachal of the UGPTI at the North Dakota State University also concluded that these assumptions are realistic and reasonable.
3 Home base state in VIUS refers to “the location where the vehicle was usually parked when not on the road, such as a home, farm, terminal, etc.” See item H of Form TC-9502, 2002 Economic Census, Vehicle Inventory and Use Survey.
4 Personal communication with Mr. Bill Weaver of the Livestock Division staff in the NASS/USDA.
5 The definition of a farm in the Census of Agriculture is “any place from which $1,000 or more of agricultural products were produced or sold, or normally would have been sold, during the census year.”
6 The “Market value of agricultural products sold” category represents gross market value before taxes and production expenses of all agricultural products sold or removed from the place in 2002, regardless of who received the payment. It is equivalent to total sales. Appendix A, Volume 1, Geographic Area Series, Part 51, AC-02-A-51, 2002 Census of Agriculture, National Agricultural Statistics Service, USDA, June 2004.
7 See http://www.ops.fhwa.dot.gov/freight/freight_analysis/faf/index.htm for further information.
8 Chin, S. M., J. Hopson, and H. L. Hwang, “Estimating State-Level Truck Activities in America,” Journal of Transportation And Statistics, Volume I, No. 1, pp 63-74, January, 1998.
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