Methods of low input application of nitrogen derived from fertilizer and organic manure on continuous cropping of melon [Cucumis melo] and watermelon [Citrullus lanatus] in plastic green house
2002
"Mitsugi, K. (Kumamoto-ken. Agricultural Experiment Station (Japan)) | Kozai, N. "
"It was investigated to improve the effective method of optinum application of fertilizer nitrogen according to an estimation of amount and behavior of nitrogen derived from chemical fertilizer and organic manure. As a result, it was found that large amount of nitrogen remained after harvest period on every farmer's fields, which either melon or watermelon were culivated, and leaching of residual nitrogen in soil do not easily occur during growth period, because the downward movement of percolating water was small. However, rainfall after growing and removal of vinyl mulching materials would result in heavy leaching of remaining fertilizer nitrogen. And it was recognized that the best way to low input of nitrogen application was to reduce the rate of fertilizer nitrogen on the basis of measurement of not only supply from organic manure but soil nitrogen before fertilization. If this procedure would be carried out, we could actually get higher yield and sugar content of each fruit vegetables and lower concentration of nitrate nitrogen in soil, even when the reduced rate of fertilizer nitrogen was 60 to 63 % for melon and 15 to 100 % for watermelon, respectively."
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