34箇年継続水稲に対する燐酸肥料の効果試験

概要

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The effect of phosphatic fertilizer on the growth of rce plant was studied by the 34-years continued field experiments in Hiroshima Agri. Exp. St. The results were as follows : Until the 4 th year from the beginning of experiment the yield of rice in the plot with superphosphate was observed to be somewhat greater than that in the plot without superphosphate. Put, on the contrary, since the 5 th year the yield has been always for 30 years greater in the latter plot than in the former. Coasequently it may b considered that the amount of P_2O_5,necessary for maintaining the normal yield of rice in this district, was contained sufficiently in applied compst (150 Kwan per Tan), in applied fish meal (9 Kwan per Tan) and also in natural resources.
社団法人日本土壌肥料学会の論文
1935-12-10