Relationship between application of organic matter and physiological activity of the root on non-agrochemical culture of paddy field by mulching recycled paper

研究了硅酸盐有机物的供应能力、根系生理活性与硅酸吸收之间的关系。这两年，Koshihikari都是通过覆盖再生纸进行移植的。第一年采用稻壳堆肥、稻草堆肥和烧焦稻壳配两个水平的基肥。第二年，4个水平的氮肥与稻壳配合使用。采集土壤溶液和基茎伤流液样，测定各氮素和硅酸含量。第一年产量222~409g/m~2。吸硅酸的大小顺序为烧焦稻壳、稻壳堆肥、稻草堆肥、对照(不施)，且土壤溶液中硅酸浓度与叶片中硅酸浓度呈正相关。伤流液硅酸积累量与叶片硅酸含量呈正比关系。第二年产量为526~615g/m~2。出血率很高，第一年大约增加了一倍。这一事实似乎是两年收益率差异出现的原因。收获时的氮素吸收随施氮量的增加而增加，稻壳施入增加了硅酸的吸收。有机栽培在保持较高的根系生理活性的同时，增加了对氮素和硅酸的吸收，病虫害小，产量高。

It was examined the relationship between supply capacity of the silicate organic material, physiological activity of the root and silica acid absorption. Both years, Koshihikari was transplanted by the mulching of the recycled paper. In the first year, it was used rice hull compost, rice straw compost and charred rice hull with two levels of basal nitrogen fertilizer. In the next year, 4 levels of nitrogen application were combined with the rice hull use. Soil solution and bleeding sap from basal stem were sampled, and each nitrogen and silicic acid content were determined. The yields in the first year were 222〜409 g per meter square. The silicic acid absorption was the order of charred rice hull > rice hull compost > rice straw compost > control (non-application) and it was the positive correlation between silicic acid concentration in the soil solution and leaves. The accumulated silicic acid in bleeding sap and silicic acid content of leaves had the proportional relation. In the next year, yields were ranged 526〜615 g per meter square. The bleeding rate was high with about the double in the first year. This fact seemed to be the reason why the yield difference of both years came out. The nitrogen absorption in the harvesting increased with the increase in the nitrogen level, and the silicic acid absorption increased by the rice hull application. The absorption of nitrogen and silicic acid were increased, when the physiological activity of the root was maintained high in the organic farming, and as this result, it was clear that there were small pest damage and that it obtains the high yield.