Useful Nutrient Management Planning Data

Filed Under:

Publication Number: IS1620

Nutrient management plans should be based on accurate information. Ideally, manure generation and content should be determined on individual farms. Nutrients removed by harvesting crops also vary from farm to farm. The data provided here suggests general guidelines based on current research and can be used in preliminary planning.

Weights of crops (per bushel)

Crop	lb/bu	Crop	lb/bu
Corn	56	Rye	56
Sorghum	56	Sudangrass	40
Soybeans	60	Potatoes	60
Wheat	60	Sweetpotatoes	55
Barley	48	Sunflowers	25
Oats	32

Length/Weight Conversion Factors

Length

1 inch = 2.54 centimeters

1 yard = 0.915 meters

1 mile = 5,280 feet = 1,610.7 meters = 1.61 kilometers

1 meter = 100 centimeters = 1,000 millimeters = 0.001 kilometers

1 chain = 66 feet = 100 links = 20.1 meters = 4 rods

Weight

1 pound = 454 grams = 0.454 kilograms = 16 ounces

1 ton (short) = 2,000 pounds

1 ton (long) = 2,240 pounds

More Speed Conversion Factors

1 mile per hour

= 1.467 feet per second
= 88 feet per minute
= 26.8 meters per hour

Other

1 pound per acre = 1.12 kilograms per hectare

1 pound per gallon = 0.119 kilograms per liter

parts per million (ppm)

= micrograms per gram
= milligrams per liter

1 gallon per acre = 9.35 liter per hectare

Common Fertilizer Analyses

Fertilizer	Analysis	Chemical Formula
N
Anhydrous ammonia	82-0-0	NH3
Ammonium nitrate	34-0-0	NH4NO3
Urea	46-0-0	(NH2)2CO
UAN solution (urea ammonium nitrate)	28 to 32-0-0	NH4NO3 + (NH2)2CO in water
Aqua ammonia	20-0-0	NH3 in water
Ammonium sulfate	21-0-0-24(S)	(NH4)2SO4
P
Triple superphosphate (TSP)	0-44 to 46-0	Ca(H2PO4)2
Diammonium phosphate (DAP)	18-46-0	(NH4)2HPO4
Monoammonium phoshate (MAP)	11-48-0	NH4H2PO4
Ammonium polyphosphate liquid (APP)	10-34-0	NH4H2PO4 + (NH4)3HP2O7
Ammonium polyshosphate dry (APP)	15-62-0	Same as liquid
K
Potassium chloride (muriate of potash)	0-0-60	KCI
Potassium sulfate	0-0-50-18(S)	K2SO4
Potassium-magnesium sulfate (sul-fo-mag)	0-0-22-22(S)-11(Mg)	K2SO4 • 2MgSO4
Potassium nitrate	13-0-44	KNO3

Soil Testing Conversions

Plow layer (6–7 inches)

= parts per million times 2
= pounds per acre

Top 12 inches = parts per million times 4 = pounds per acre

Manure Generation and Nutrient Content

Animal	Average Weight of Animal (lb)	Manure Production (lb/d/1,000#) (lb/d/1,000#)		Nutrient Content (cf/d/1,000#)
				N	P2O5	K2O
Dairy cow	1,200	80.00	1.30	0.45	0.16	0.31
Feeder swine	135	63.40	1.00	0.42	0.36	0.26
Gestation sow	375	27.20	0.44	0.19	0.14	0.14
Lactation sow w/ pigs	475	60.00	0.96	0.47	0.34	0.36
Nursery pig	20	106.00	1.70	0.60	0.57	0.42
Pullet litter	3	10.10	0.29	0.16	0.20	0.18
Breeder litter	8	13.40	0.38	0.21	0.27	0.23
Broiler litter	2	17.80	0.57	0.52	0.43	0.33

Nutrient Management Data

Plant Nutrient Removal (lb per acre unit of indicated yield)

	N	P205	P	K20	K
Corn, 100 bushels grain	90	44	19	27	22
1 ton dry stover	22	8	4	32	26
Silage, ton	10	3.1	1	7	6
Cotton, bale	32	14	6	19	16
Rice, 150 bushels	86	45	20	24	20
Bahiagrass, ton	43	12	5	35	29
Hybrid bermudagrass	50	12	5	43	36
Sweetpotatoes, 100 bushels	24	13	6	56	46
Tall fescue	27	12	5	54	45
Soybeans, 40 bushels	152	34	15	52	43
Grain sorghum, 80 bushels	53	31	14	22	18
Wheat, 50 bushels	65	30	13	17	14
Peanuts, 6 tons	420	66	29	102	85
Dalligrass (5.8 tons/acre)	209	70	30	293	244
Annual ryegrass (4.5 tons/acre)	270	72	32	225	187

Fertilizer Conversion Factors

P2O5 X 0.44 = P

P X 2.29 = P2O5

K2O X 0.83 = K

K X 1.20 = K2O

1 gallon of water = 8.328 pounds

1 gallon of UAN (28%N) = 10.6 pounds

Area/ Volume Conversion Factors

Area

1 acre

= 43,560 feet2
= 0.405 hectare

1 hectare = 10,000 meters2

1 yard2 = 0.836 meter2

1 chain2

= 0.10 acre
= 16 rods2

1 mile2 = 640 acres

Volume

1 bushel (level)

= 1.244 feet3
= 8 gallons (dry)
= 9.31 gallons (liquid)
= 35.24 liters

1 liter = 1,000 milliliters or centimeters3

1 gallon (liquid)

= 3.78 liters
= 128 fluid ounces
= 4 quarts
= 8 pints

1 acre-foot

= 43,560 feet3
= 1,613 yards3
= 325,851 gallons

1 cup

= 236.6 centimeters3
= 0.236 liters
= 8 ounces
= 16 tablespoons

Information Sheet 1620 (POD-03-20)

Revised by Larry Oldham, PhD, Extension Professor, Plant and Soil Sciences.

Copyright 2020 by Mississippi State University. All rights reserved. This publication may be copied and distributed without alteration for nonprofit educational purposes provided that credit is given to the Mississippi State University Extension Service.

Produced by Agricultural Communications.

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Extension Service of Mississippi State University, cooperating with U.S. Department of Agriculture. Published in furtherance of Acts of Congress, May 8 and June 30, 1914. GARY B. JACKSON, Director

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