窒素施肥反応の異なるキャベツ3品種の生育と時期別養分吸収に関する品種間差異

概要

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We have analyzed the growth and nutrient absorption of three commercial cabbage (Brassica oleracea L.) cultivars, Kogetsu, Syunrai 500 and YR Ryokuhou, under varying levels of nitrogen (N) (100, 150, 200, 250 and 300 kgha^<-1>). In all cultivars, growth and N concentration differed with varying N application. In a previous report, we showed that growth was correlated with the growth rate in the first 20 d ; thus, we could estimate head weight from growth and head weight rates. Nitrogen absorption patterns were similar during the first growth stage of all cultivars. However, applied nitrogen efficiency (fresh weight of cabbage head per kg N applied) was highest at 100 kg N ha^<-1> in Kogetsu, 150 kg N ha^<-1> in Syunrai 500 and 200 kg N ha^<-1> in YR Ryokuhou. In Kogetsu, N absorbed during the outerleaf development phase contributed to growth, while N absorbed during the head development phase contributed in Syunrai 500. The concentrations of macronutrient phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) in the plants varied with the N level. Moreover, the K content varied in all cultivars during the head development phase and at low N levels. The Ca concentration in the outerleaves of Kogetsu was higher than other cultivars.
社団法人日本土壌肥料学会の論文
1997-10-05