水稻覆膜穴播栽培的节水效应研究

采用田间小区试验的方法，对覆膜穴播水稻进行了不同灌水量的处理，在生长前期进行了小气候观测和水稻生育性状、产量构成的观测。试验表明，覆膜穴播技术能充分利用前期的光热资源，不同灌水量处理的田间土壤水分含量在后期趋于一致，随灌水量减少，收获穗数减少，穗粒数增加，千粒重减少。考虑一节水与稳产相统一的目的，在引黄灌区推广覆膜穴播栽培技术，节水1／3－1／2是可以实现的。

A Study of Water-saving Effects in Rice Cultivation Mulched by Plastic Film in Hole Sowing

The experiments on irrigation of different amounts and times in rice cultivation mulched by plastic film in hole sowing were conducted. The microclimate of the field in the earlier stage, growing properties, and the yield structures of rice were measured. The water content of the rice field tended to the same level in the later growing periods by the different amounts of irrigation. As the amount of irrigation decreased, the number of spikes and the thousand-grain weight decreased as well, but the grains per spike increased. In consideration combined the water-saving with the steady yield of rice, one third to a half amount of irrigation could be saved by applying the techniques of rice cultivation mulched by plastic film in hole sowing in the irrigated areas of Ningxia.