|
Table 1. Model Variables and Respective Estimated Coefficients._____________________ | |
|
Variable Meaning__________________________________________ |
Coefficient________ |
|
tcmc Total crop machinery cost, dollars | |
|
fcwof Field cultivation without fertilizer, acres |
β1 |
|
swof Sweep/undercut without fertilizer, acres |
β2 |
|
dsk Disk, acres |
β3 |
|
sch Chisel, less than 12 inches deep, acres |
β4 |
|
dch Chisel, greater than 12 inches deep, acres |
β5 |
|
ddch Disk chisel/disk-deep chisel, acres |
β6 |
|
mbp Moldboard plow, acres |
β7 |
|
rcc Row crop cultivate, acres |
β8 |
|
dntwof No-till drill and/or air-seed without fertilizer, acres |
β9 |
|
drtwof Regular-till drill and/or air-seed without fertilizer, acres |
β10 |
|
pntwof No-till plant without fertilizer, acres |
β11 |
|
prtwof Regular-till plant without fertilizer, acres |
β12 |
|
spc Spray chemical, acres |
β13 |
|
spf Spray fertilizer, acres |
β14 |
|
spcf Spray chemical and fertilizer, acres |
β15 |
|
nh3 Anhydrous ammonia application, acres |
β16 |
|
bdf Broadcast dry fertilizer, acres |
β17 |
|
ilf Inject liquid fertilizer, acres |
β18 |
|
hw Harvest wheat, acres |
β19 |
|
whtyd Wheat yield above base rate × wheat acres, bushels |
β20 |
|
hc Harvest corn, acres |
β21 |
|
cornyd Corn yield above base rate × corn acres, bushels |
β22 |
|
hgs Harvest grain sorghum, acres |
β23 |
|
gsyd Grain sorghum yield above base rate × grain sorghum acres, bushels β24 | |
|
hsb Harvest soybeans, acres |
β25 |
|
sbyd Soybean yield above base rate × soybean acres, bushels |
β26 |
|
hsf Harvest sunflowers, acres |
β27 |
|
swth Swath, acres |
β28 |
|
rh Rake hay, acres |
β29 |
|
slrb Large round bales below 1,500 pounds, bales |
β30 |
|
llrb Large round bales above 1,500 pounds, bales |
β31 |
|
lsb Large square bales, bales |
β32 |
|
ssb Small square bales, bales |
β33 |
|
cs Chop silage, tons |
β34 |
|
rm Rotary mow, acres |
β35 |
|
fpm Farm pickups and service vehicles, miles |
β36 |
|
gsm Trucks hauling grain and hay, miles |
β37 |
|
Fertilizer operation adjustment percent fcwf Field cultivation with fertilizer, acres swf Sweep/undercut with fertilizer, acres dntwf No-till drill and/or air-seed with fertilizer, acres_______________ |
β38 |
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