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Fertilizer Recommendation Tables - 2008 Revision

Author:	Keith Reid - Soil Fertility Specialist/OMAFRA
Creation Date:	October 2007
Last Reviewed:	November 2008

2008 Revision

Phosphorus Requirement Table - Field Crops

Phosphate (P₂O₅) Required - kg/ha
Soil phosphorus (0.5 M sodium bicarbonate extract) mg P L _{1of soil (ppm P)}	Corn, Sweet. corn, sorghum, sunflower	Spring barley, mixed grain, spring wheat	Soybeans, field beans, snap beans, lima beans, peas	Oats, spring rye, mustard, canola, fodder rape, kale, buckwheat, flax, millet, unimproved pasture
0-3	110 HR	110 HR	80 HR	70 HR
4‑5	100 HR	100 HR	60 HR	60 HR
6‑7	90 HR	90 HR	50 HR	50 HR
8‑9	70 HR	70 HR	40 HR	30 HR
10‑12	50 MR	50 MR	30 MR	20 MR
13‑15	20 MR	20 MR	20 MR	20 MR
16‑20	20 MR	20 MR	0 LR	0 LR
21‑25	20 LR	0 LR	0 LR	0 LR
26‑30	20 LR	0 LR	0 LR	0 LR
31‑40	0 RR	0 RR	0 RR	0 RR
41‑50	0 RR	0 RR	0 RR	0 RR
51‑60	0 RR	0 RR	0 RR	0 RR
61‑80	0 NR*	0 NR*	0 NR*	0 NR*
80+	0 NR*	0 NR*	0 NR*	0 NR*

* adding nutrients to soils with these levels of nutrients may reduce crop yields or quality by interfering with the uptake of other nutrients.

Phosphate (P₂O₅) Required - kg/ha
Soil phosphorus (0.5 M sodium bicarbonate extract) mg P L ^-1 of soil (ppm P)	Winter wheat, winter barley, winter rye, winter triticale	Winter or spring cereals seeded down, (oats, mixed grain, barley, wheat, rye, triticale)	Hay-pasture direct seed (band seeded)	Established hay-pasture, grass for seed
0-3	70 HR	130 HR	130 HR	180 HR
4‑5	60 HR	110 HR	110 HR	120 HR
6‑7	50 HR	90 HR	90 HR	90 HR
8‑9	30 HR	70 HR	70 HR	60 HR
10‑12	20 MR	50 MR	50 MR	30 MR
13‑15	20 MR	30 MR	40 MR	20 MR
16‑20	20 MR	20 MR	30 MR	0 LR
21‑25	0 LR	20 MR	20 MR	0 LR
26‑30	0 LR	0 LR	20 LR	0 RR
31‑40	0 LR	0 LR	20 LR	0 RR
41‑50	0 RR	0 RR	20 LR	0 RR
51‑60	0 RR	0 RR	0 RR	0 RR
61‑80	0 NR*	0 NR*	0 NR*	0 NR*
80+	0 NR*	0 NR*	0 NR*	0 NR*

*adding nutrients to soils with these levels of nutrients may reduce crop yields or quality by interfering with the uptake of other nutrients.

The fertilizer rates in this table are designed to produce highest economic yields when accompanied by good or above average management. Research data show that higher rates will occasionally produce higher yields but that these increases in yield are likely to be small and uneconomic.

HR, MR, LR, RR, and NR denote, respectively, high, medium, low, rare and no probabilities of profitable crop response to applied nutrient.

Approved: Ontario Soil Management Research and Services Committee (June 2008).

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