Page 40 of the Precision Farming Profitability book. In the example, the total
lime for the field should be 30 tons (6ton*3acres+3ton*4acres +0ton*3 acres = 30 ton), not 24 tons.
This error has effects through the subsequent calculations, so that Table 2 on p. 41 is a lime cost for the
Site-Specific option of $189 annually, instead of $151.20, and the Average Net per field/year is -$27.26.
A corrected spreadsheet is provided below.
VRT Lime Example Economic Calculations - Corrected
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	107.80	5.2	123.20	15.40	6.5	138.18	30.38
Middle zone	4	5.5	163.80	6.2	174.60	10.80	6.5	176.40	12.60
SE zone	3	7	176.40	7.7	172.80	-3.60	7.0	176.40	0.00
Field Yield Gain			150.78		158.64	78.60		164.93	141.54
Soybean
NE zone	3	4.5	34.20	5.2	38.70	4.50	6.5	42.75	8.55
Middle zone	4	5.5	53.40	6.2	56.40	3.00	6.5	57.00	3.60
SE zone	3	7	57.00	7.7	55.80	-1.20	7.0	57.00	0.00
Field			48.72	6.32	50.91	21.90	6.65	52.73	40.05
Total Lime			0		20			30
Table 2. Expected Profits from Variable Rate Lime on Example Field
Item		Uniform	VRT	Difference			Parameters:
							Nominal Corn Price		2.25	$/bu.
Value of Yield Change							Nominal Soy Price		5.5	$/bu.
Corn, $		113.97	205.23	91.26			Effective Corn Price		1.45	$/bu.
Soybeans, $		110.60	202.25	91.66			Effective Soy Price		5.05	$/bu.
Average Gain, $		112.28	203.74	91.46
Soil Testing Cost, $		2.45	21.00	18.55
Application Fee, $		10.50	21.00	10.50
Lime, $		126.00	189.00	63.00
Net per field/year, $		-26.67	-27.26	-0.59
Net per acre/year, $		-2.67	-2.73	-0.06