论文信息 - Graphical analysis of annual crop response to fertiliser application

Graphical analysis of annual crop response to fertiliser application

Abstract The effect of fertiliser application on crop yield is described by the interactive effects of two relations: that between fertiliser application and fertiliser uptake (the recovery of fertiliser) and that between nutrient uptake and yield. It is argued that the latter relation is invariable for a given combination of crop species and plant nutrient, as illustraed for nitrogen on bunded rice. Virtually all variability in application-yield relations results from differences in the parameter values characterising the relation between nutrient application and nutrient uptake. The uniqueness of the uptake-yield relation permits its use in the determination of nutrient recovery from measured application-yield data. The use of this procedure to formulate fertiliser recommendations for specific situations is discussed.

H. van Keulen | H. Keulen

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