異なる施肥窒素レベルにおけるキャベツ品種の収量および窒素吸収特性

概要

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We have analyzed growth under different nitrogen levels(150, 200 and 250 kg ha^<-1>)in ten commercial cultivars of Japanese cabbage(Brassica oleracea L.). Potassium and phosphorus levels ramained constant throughout the experiments. Every cultivar showed an increase in head weight with increasing nitrogen levels. However, the extent of those increases were different among the cultivars examined. Similar trends were also seen in the total amounts of nitrogen in the plants. In contrast, the nitrogen efficiency ratios(FW/N, grams of fresh weight of head per milligram of N in the plants)decreased in most cultivars when more nitrogen was applied. Four major minerals concentrations(P, K, Ca and Mg in g kg^<-1>)in the plants were different among the cultivars, however most concentrations were positively correlated with the amount of nitrogen applied in all but one cultivar. In some cultivars, the increment patterns of the Ca concentration were different from that of the other minerals.
社団法人日本土壌肥料学会の論文
1996-02-05