RESIDUAL EFFECTS OF PHOSPHORUS FERTILIZER. I. FOR WHEAT GROWN ON FOUR CHERNOZEMIC SOIL TYPES IN SASKATCHEWAN AND MANITOBA

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Abstract
The effects of single applications of 100, 200, and 400 kg/ha of P were measured under field conditions on Chernozemic soils in Manitoba and Saskatchewan for 8 yr. All applications of P increased the yield of wheat and increased the amount of available P in the soil. The addition of P with the seed did not increase the yield on plots that had received 100 kg/ha of P or more, except in 2 yr at one of the four test locations. On extremely P-deficient soils in Manitoba, 21% of the broadcast P (applied at 100 kg P/ha) was recovered by grain in 8 yr; the percent recovered was lower from the 200 and 400 kg P/ha at all sites (15 and 9%, respectively) but the amount of available P remaining in the soil was greater. Single large applications of 100 kg/ha of P were shown to be effective over the 8-yr period. Higher rates of application showed little advantage over 100 kg P/ha in the 8 yr but would probably remain effective for longer periods.

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