培養土の理化学性とセル成型苗の生育

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The responses of vegetable plug seedlings were examined to determine the suitable physical and chemical properties for their growth under substrates mixed with different ratios of soil, peat and calcined vermiculite. 1) Mixed substrates covered wide ranges of bulk density (0.12-0.75g mL^<-1>), vapor phase ratios (13-31%), porosity (75-96%) and cation exchange capacity (7-21 cmol(+)L^<-1>). 2) Air porosity lower than 20% suppressed the growth of seedlings of Chinese cabbage (Brassica Pekinensis Rupr), cabbage (Brassica oleracea L.), cucumber (Cucumis sativus L.) and tomato (Lycopersicon esculentum Mill.) growth were suppressed at an air porosity lower than 16%. 3) Higher porosity of the substrates raised the ratio of root ball formed in the plugs for all of the vegetables. Satisfactory root balls (over 90% of the seedlings) were formed at 85% porosity for Chinese cabbage, cucumber and tomato ,and at 90% for lettuce (Lacutuca sativa L.) and cabbage. The air porosity values were 21 and 26%, respectively, under these conditions. 4) Cation exchange capacity affected leaching losses and plant absorption of nitrogen during the seedling raising period. However, cation exchange capacity did not affect the growth of tomato much during the seedling raising period and after transplanting. It was concluded that the cation exchange capacity of the growing substrates be maintained at a level of not less than 11 cmol(+)L^<-1> to ensure nomal plant growth.
社団法人日本土壌肥料学会の論文
2000-10-05

培養土の理化学性とセル成型苗の生育

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