Economic Calculations - 4 ton limit
Corn Yield Goal		180	bu./a
Soy Yield Goal		60	bu./a
Average pH =		5.65
Table 1. Expected Yield Gain from Site Specific Lime Application
			Expected	pH After	Expected	Difference	pH After	Expected	Difference
	Zone	Initial	Yield at	2 ton	Yield at	From	Site	Yield at	From
Crop & Zone	Area	pH	Initial pH	Uniform	Uniform	Initial	Specific	Uniform	Initial
			--bu./a----		--bu./a----	--bu./a----		--bu./a----	--bu./a----
Corn
NE zone	3	4.5	139.07	5.2	157.53	18.46	5.8	169.74	30.66
Middle zone	4	5.5	164.42	6.2	173.49	9.08	6.5	175.68	11.27
SE zone	3	7	176.33	7.7	173.33	-3.00	7.0	176.33	0.00
Field Yield Gain						82.68			137.06
Soybean
NE zone	3	4.5	45.43	5.2	51.25	5.82	5.8	55.12	9.69
Middle zone	4	5.5	53.43	6.2	56.31	2.89	7.2	57.24	3.81
SE zone	3	7	57.24	7.7	56.24	-1.00	7.0	57.24	0.00
Field Yield Gain						26.01			44.31
Table 2. Expected Profits from Variable Rate Lime on Example Field
Item		Uniform	VRT	Difference			Parameters:
							Nominal Corn Price		2.5	$/bu.
Value of Yield Change							Nominal Soy Price		6	$/bu.
Corn, $		140.56	233.01	92.45			Effective Corn Price		1.7	$/bu.
Soybeans, $		144.33	245.93	101.60			Effective Soy Price		5.55	$/bu.
Average Gain, $		142.45	239.47	97.02
Soil Testing Cost, $		2.45	21	18.55
Application Fee, $		10.5	21	10.50
Lime, $		126	151.2	25.20
Net per field/year, $		3.50	46.27	42.77
Net per acre/year, $		0.35	4.63	4.28