Usage of two databases, one containing prefectural recommendations of fertilizers and manure application, and the other containing nutrient contents of crops in Japan
2009
Kanazawa, K.(National Agricultural Research Center, Tsukuba, Ibaraki (Japan))
Databases of representative values of prefectural fertilizer recommendations and crop nutrient content values are constructed in order to establish fundamental data sets for the national scale trend analyses of nutrient demand for crop production and/or of the environmental influence by nutrient management in agricultural fields in Japan. National annual demand of nitrogen (N), phosphorus (as P2O5), and potash (as K2O) were estimated at 465 kton, 468 kton, and 531 kton, respectively, using national average of representative values of prefectural fertilizer recommendations for 132 crops and their cultivated land area. These estimated values corresponded 99% for N, 101% for P2O5, and 148% for K2O of annual nutrient consumption data based on chemical fertilizer statistics. Chemical fertilizer usage would decrease if such nutrient management becomes more popular that takes account of nutrient supply from manure.
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