Studies on the improvement of manuring management if direct sowing culture of rice plant

从施肥时间和施肥空间的角度研究了水田直播栽培水稻的施肥方法。穗形期距山5cm处5、15cm处补施对植株生长和产量影响较大。深施补肥改善了水稻植株的截光特性，提高了生产粒率和成熟粒率。观察了深层施肥对根系生长和活性的生理影响。认为在施肥时由于切根而长出了许多新根，并在生育后期才发挥作用

On the manuring methods for direct sowing culture or rice plant in welldrained paddy field was investigated in relation to manuring time and space of fertilizer application.Additinal fertilizer application to deeper layer 5 and 15cm depth at 5 cm distance from hill at the panicle formation stage was more effective to the growth and yield. The chatacteristics of light-intercepting of rice plant was improved by the additional fertilizer application to deeper layer, so that percentage of productive clums and percentage of ripened grains were rised.Physiological effects of the fertilizer application to deeper layer were observed in root growth and activity. It was considered that many new root grew due the root cutting at the fertilizer application time and functioned till later growing period