Nutrient Management Workbook

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Nutrient Management Workbook

Author:	OMAFRA Staff
Creation Date:	10 December 2003
Last Reviewed:	25 November 2004


1. Farmstead Information Part 1 Part 2	2. Nutrient Management Workbook Summary Metric Version Imperial Version
3. Guide to Completing the Workbook - Sections A to S
Section A - Field Information Section B - Maximum Allowable Liquid Loading Rate Section C - Manure Information Section D - Commercial Fertilizer Section E - Previous Crop Nitrogen Section F - Previous Manure Nitrogen Section G - This Year's Manure Section H - Ontario Crop Production Requirements Section I - Agronomic Nutrient Balance Section J - Field Inputs	Section K - Manure Nutrients Applied Section L - Crop Removal Section M - Crop Removal Balance Section N - Nitrogen Available for Potential Loss Section O - Nitrogen Index Section P - Phosphorous Index Section Q - Minimum Separation Distance from Surface Water Section R - Useable Acreage Section S - Maximum Rates
4. Glossary	5. For More Information...

Guide to Completing the Workbook - Sections A to S

The workbook is a tool that simulates the NMAN Software.

This workbook is organized in sections, from A to S, with each line of the Worksheet corresponding to the detailed descriptions found here help you develop the required information.

Crop Removal Section

Section J - Field Inputs

Calculate the field inputs for the crop removal balance

N	N	Inputs = Line D + Line E + Line F	(on the Worksheet)
P₂0₅	P₂0₅	lnputs = Line D	(on the Worksheet)

Section K - Manure Nutrients Applied

Calculate the manure nutrients applied for the crop removal balance

N	N	Applied = Line G	(on the Worksheet)
P₂0₅	P₂0₅	Applied = Line G x 2	(on the Worksheet)

The same value for N applied in manure is used in the agronomic and crop removal balances. The value for P₂0₅applied in manure is doubled to account for a greater proportion of phosphorus available for soil buildup than for this year's crop (80% rather than 40%).

Section L - Crop Removal

Use the following chart and equation to determine the nutrient removal value(s) for this year's crop.

Table 10: Nutrient Removal of Common Field Crops
Crop	Base Yield		Removal Base Value (lb/ac)
	tonne/ha	Imperial	N		P₂0₅		K₂0
	tonne/ha	Imperial	kg/ha	lb/ac	kg/ha	lb/ac	kg/ha	lb/ac
Corn	9.1	145 bu/ac	135	120	68	61	47	42
Corn Silage (12 ton/ac DM)	40	18 ton/ac	231	206	103	92	215	192
Wheat (soft red/white)	5	75 bu/ac	101	90	49	44	30	27
Wheat (soft red/white) + straw	5	75 bu/ac	165	147	59	53	138	123
Wheat (hard red)	5	75 bu/ac	118	105	49	44	30	27
Barley	4	75 bu/ac	84	75	34	30	26	23
Barley + straw	4	75 bu/ac	112	100	41	37	103	92
Oats	3.1	80 bu/ac	62	55	21	19	17	15
Soybeans	3	45 bu/ac	217	194	47	42	78	70
Dry Edible Beans	2	30 bu/ac	84	75	28	25	28	25
Legume Forage (dry matter basis)	11.2	5 ton/ac	352	314	73	65	336	300
Mixed Forage (dry matter basis)	11.2	5 ton/ac	314	280	73	65	336	300
Grass Forage (< 1/3 legumes) (DM basis)	11.2	5 ton/ac	196	175	56	50	196	175
Canola	2.5	45 bu/ac	106	95	62	55	30	27

Source: Potash and Phosphate Institute, 1997

Crop Removal = ( Base Value ) ( Estimated Yield / Base Yield )

Example:
A crop of corn is expected to yield 135 bu/ac. What is the P205 crop removal value?
P₂0₅ Crop Removal = ( 61 lb/ac ) ( 135 bu/ac / 145 bu/ac ) = 57 lbs/ac

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For more information:
Toll Free: 1-866-242-4460
E-mail: nman.omafra@ontario.ca

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