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Fertilizer Recommendation Tables - 2007 Revision

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

2007 Revision

Potassium Requirement Table - Vegetables on Mineral Soils

Potash (K₂O) Required - kg/ha
Soil potassium, (1 M ammonium acetate extract)mg K L^-1 of soil (ppm K)	Radish	Snap bean, lima beans, field beans, soybeans, peas	Sweet corn	Sugar beet***	Tomato(paste, fresh market)Cucumber, muskmelon, watermelon, pumpkin, squash, ginseng
0‑15	60 HR	120 HR	170 HR	180 HR	230 HR
16‑30	60 HR	110 HR	160 HR	170 HR	220 HR
31‑45	50 HR	90 HR	140 HR	160 HR	200 HR
46‑60	50 HR	80 HR	110 HR	140 HR	180 HR
61‑80	40 MR	60 MR	80 HR	120 HR	140 HR
81‑100	30 MR	40 MR	50 MR	90 MR	100 HR
101-129	30 MR	30 MR	30 MR	70 MR	70 MR
121-150	20 MR	0 LR	0 LR	20 MR	50 MR
151-180	20 MR	0 RR	0 RR	0 LR	40 MR
181-210	0 LR	0 RR	0 RR	0 LR	0 LR
211-250	0 RR	0 RR	0 RR	0 RR	0 RR
250+	0 NR*	0 NR*	0 NR*	0 NR*	0 NR*

Potash (K₂O) Required - kg/ha
Soil potassium, (1 M ammonium acetate extract)mg K L^-1 of soil (ppm K)	Beet, onion, spinach, lettuce, endive, garlic, chive, carrot, horseradish, parsnip, potato, garden	Broccoli, brussels sprout, cabbage, cauliflower, pepper, eggplant	Rutabaga**, turnip, celery, rhubarb	Asparagus (all plantings)	Tomato (whole pack)**
0‑15	230 HR	270 HR	340 HR	420 HR	660 HR
16‑30	220 HR	250 HR	330 HR	400 HR	640 HR
31‑45	210 HR	230 HR	310 HR	360 HR	600 HR
46‑60	190 HR	200 HR	280 HR	320 HR	560 HR
61‑80	160 HR	170 HR	250 HR	280 HR	480 HR
81‑100	130 HR	130 HR	200 HR	250 HR	400 HR
101-129	100 MR	100 MR	150 MR	220 HR	340 MR
121-150	80 MR	80 MR	90 MR	190 MR	300 MR
151-180	50 MR	50 MR	50 MR	160 MR	280 MR
181-210	0 LR	0 LR	0 LR	130 MR	140 MR
211-250	0 RR	0 RR	0 RR	80 MR	70 MR
250+	0 NR*	0 NR*	0 NR*	0 LR	0 LR

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

** For whole pack tomatoes and rutabagas on soils with magnesium tests less than 100 the required amount of potash should be adjusted downward from the amounts shown to a minimum rate of 50% of table values at a magnesium test of 50. Fertilizer rates in this table are designed to produce highest economic yields when accompanied by good or above average management.

*** Excess application of potassium will lead to luxury consumption by the sugar beet plant. This has a negative effect upon clear juice purity.

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 2007)

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