Yield response and economic implications of seed-placed phosphorus on stubble and summerfallow spring wheat and durum
de Jong, E.
Peer Reviewed StatusNon-Peer Reviewed
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Several growing seasons data on phosphorus responses of stubble and summerfallow crops have been summarized. Spring wheat and durum wheat show a 85 and 65 % probability of a positive response to seed-placed phosphorus on fallow and stubble, respectively. At 1987 prices, the probability of an economic response to P fertilization is less than 50 % on fallow and less than 35 % on stubble. Boundary line analysis was used to determine the relationship between crop yield and available spring soil water, rainfall, soil + fertilizer nitrogen and soil phosphorus. A curve was drawn through the uppermost points in a plot of yield against a single independent variable and it was assumed that this line represents the maximum possible yield for a given value of the independent variable. Points below this line represent yields limited by other variables for which boundary line curves were also determined. It was assumed that the limiting factors were multiplicative. This analysis accounted for almost 80 % of the variability in yield.
Part OfSoils and Crops Workshop
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