野菜類セル成型苗の培養土の適当なリン酸濃度

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The suitable phosphate concentration of substrates for vegetable plug seedlings was evaluated from the growth and phosphate content rates of the seedlings, and their seed phosphate contents, while the phosphate absorption coefficient of the raw materials of substrate was measured. 1 ) Sphagnum peat and coconut husk fiber were 0 g kg^<-1>, calcined vermiculites were 0 to 7.5 g kg^<-1>, and zeolites were 5 to 18.3 g kg^<-1> for the phosphate absorption coefficient of the given figure of the substrate raw materials. The phosphate absorption coefficient for the offered substrates, which consisted of sphagnum peat and calcined vermiculite, was 0.4 g L^<-1>. 2 ) The phosphate content rates from which good growth of seedlings was obtained were 12 to 21 g kg^<-1> for lettuce (Lacutuca sativa L.), 8 to 24 g kg^<-1> for Chinese cabbage (Brassica Pekinensis Rupr), 9 to 33 g kg^<-1> for cabbage (Brassica oleracea L.), 9 to 36 g Kg^<-1> for cucumber (Cucumis sativus L.) and 6 to 38 g kg^<-1> for tomato (Lycopersicon esculentum Mill.). 3 ) The water-soluble phosphate of the substrates from which good growth of seedlings was obtained were over 17 mg L^<-1> for lettuce and cabbage, 17 to 296 mg L^<-1> for Chinese cabbage, over 3 mg L^<-1> for cucumber and 29 mg L^<-1> for tomato. Therefore, the water-soluble phosphate which produced normal seedlings was 29 to 296 mg L^<-1> for each crop. There was no growth control even in phosphate non-use for the cucumber. 4 ) In comparison with the cucumber, the crops on the seeds of which the effect of supplied phosphate was big while the effect of used phosphate on the substrates was small were soybean (Glycine max Merr.), kidney bean (Phaseolus vulgaris L.), pumpkin (Cucurbita maxima×C. moschata), melon (Cucumis melo L.) and okra (Abelmoschus esculentus Moench.). On the other hand, the crops for which the effect of supplied phosphate on the seeds was small while the effect of used phosphate on the substrates was big were tomato, red pepper (Capsicum annuum L. 'tokyo sisitoh'), eggplant (Solanum melongena L.), sweet pepper (Capsicum annuum L. 'suigyoku2goh'), oriental melon (Cucumis melo L. var. flava Makino 'ohgon 9 goh'), wax gourd (Benincasa hispida Cogn.), lettuce, Chinese cabbage and cabbage.
社団法人日本土壌肥料学会の論文
2001-04-05

野菜類セル成型苗の培養土の適当なリン酸濃度

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