培養液のNO_3-N/NH_4-N比がやし殻繊維を培地とする循環型養液栽培における培養液組成とトマトの生育・収量に及ぼす影響

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Tomato plants were grown in a closed hydroponic system using coir or rockwool as substrate (coir-and rockwool-systems) for about 5 months to study the effects of NO_3-N/NH_4-N ratios of nutrient solution on the fluctuation of ion concentration in a recirculating nutrient solution and the growth and yield of tomato. Three nutrient solutions varied in NO_3-N/NH_4-N ratios (14.8 mM/ 1.2 mM=standard solution, 16/0=solution I, 12/4=solution II) were designed to produce neutral, basic and acidic condition in the medium. The results obtained were as follows : 1 . In solution I and standard solution plots, the pH of the recirculating solution was more stable in coir-system than in rockwool-system, whereas in the solution II plot, the pH was drastically decreased. 2 . In coir-system, ion conceuatrations in the recirculating solution were much more stable than those in rockwool-system, especially in solution I. 3 . Plant vigour was the strongest in the standard solution plot in both systems, and in the coir-system, total yields were the highest in the standard solution plot, but marketable fruits yields were the highest in solution I plot. In rockwool-systems, total yields were highest in the solution I plot, and there were little difference between solution I and standard solution in marketable fruit yields. Of all the plots, the marketable fruit yields were the highest in the solution I plot in the coir-system. 4 . In the coir-system, the higher pH of the recirculating solution made the CEC of substrate increase in solution I, which contained NO_3-N alone as its nitrogen source, and reduce the fluctuation of ion concentration. Consequently both marketable fruit ratios and yields became the highest among the treatments.
社団法人日本土壌肥料学会の論文
2001-04-05

培養液のNO_3-N/NH_4-N比がやし殻繊維を培地とする循環型養液栽培における培養液組成とトマトの生育・収量に及ぼす影響

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