無代かきおよび育苗箱全量施肥栽培水田における水稲の生育,収量,食味と窒素,リンの収支

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Three experimental plots were set up: 1. A conventional plot, where conventional plowing and piddling were practiced with the application of conventional doses of N-P-K as the basal and two top-dressings. 2. No-piddling plot, where conventional plowing without piddling was practiced before transplanting and all the N was applied to a nursery box in the form of a coated fertilizer (containing 30% N and 10% K_2O), with P and K supplemented as the basal dressing before plowing. 3. No-fertilizer plot, where plowing and piddling were practiced but neither fertilizers nor pesticides was applied. The leaf length, tillering number and yield of rice plants of the no-piddling plot were less than those of the conventional plot, but palatability was improved. The nutrient concentrations of surface, subsurface, irrigation and rainwater were measured in three plots. After cultivation, the contents of nitrogen and phosphate in the unhulled rice of three plots were measured. The nutrient loads of irrigation water, rainwater and fertilizer were counted as incoming factors into the paddy fields. The nutrient loads of surface water, subsurface water and unhulled rice yield were taken into account of the outgoing factors from the paddy fields. In the conventional plot, the incoming factors of nitrogen and phosphate were greater than their outgoing factors because of too much fertilizer. In the no-piddling plot, the incoming and outgoing factors of nitrogen were balanced because of a smaller amount of fertilizers than the conventional plot. In the no-fertilizer plot, outgoing factors were greater than the incoming factors, thus the nutrients in the soil were transferred into the unhulled rice.
社団法人日本土壌肥料学会の論文
2000-10-05

無代かきおよび育苗箱全量施肥栽培水田における水稲の生育,収量,食味と窒素,リンの収支

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