Agro-environmental fertilization guide

Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs

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Agro-environmental fertilization guide

Assessment of the Phosphorus Content in the Harvested Portion of Crops

Under the Regulation respecting the reduction of pollution from agricultural sources (RRPAS), the phosphorus sample from the harvested portion of the crop serves as a basis for determining the amount of phosphorus that may be contributed by animal waste and farm compost within an agro-environmental fertilization plan (AEFP). This value is obtained by multiplying the amount of phosphorus in one tonne of the harvested portion of a crop, obtained from the table appearing on the following page, by the yeld for this crop. This assessment must be based on the yields obtained by the agricultural operation concerned according to the data provided by the RAAQ (the Québec agricultural insurance board).

However, it may happen that an agricultural operation does not use the insurance products offered by the RAAQ or a crop is not covered by an insurance program offered by this organization. In such cases, the person who has to prepare an AEFP for such an operation must determine the crop yield of the agricultural operation according to the methods elaborated by the RAAQ for this purpose.

**Crop phosphorus content**
**according to different parts of the plant**¹
Crop	Part of plant	Humidity (%)	Quantity of phosphorus sampled² (kg P/tonne)
Oats	Grain Straw	14 D.M.	4.0 1.0
Wheat	Grain Straw	14 D.M.	4.0 1.0
Barley	Grain Straw	14 D.M.	4.0 1.0
Grain corn	Grain Stem and leaf	15 D.M.	3.0 1.3
Silage corn	Whole plant (above-ground portion)	D.M.	2.5
Rye	Grain Straw	14 D.M.	3.2 1.0
Grain hay less than 40 % legume	Whole plant (above-ground portion)	D.M.	2.5
Legume hay more than 40 % legume	Whole plant (above-ground portion)	D.M.	3.0
Potatoes	Tubers Tops (before topping)	80 D.M.	0.5 1.8
Soya	Beans Tops	10 D.M.	6.0 2.5
Canola	Grain Whole plant (flowering)	10 D.M.	7.0 2.9
Colza fodder	Whole plant (after flowering)	D.M.	3.2

1 Samples from "Fertilization Recommendations" (AGDEX 540, 2nd edition) published by the Conseil des productions végétales du Québec inc.

^{2The
quantity of phosphorus sampled is expressed per tonne harvested for the percentage of
humidity indicated or on a dry matter basis (D.M.).}