有机肥对提高旱作土壤水分利用率的效应

The Effect of Organic Fertilizer Upon Water Use Efficiency in Rainfed Land

旱作土壤施用有机肥料能明显提高作物产量和水分利用率。在陇中半干旱地区，小麦的最佳有机肥施用量为３０６８ｋｇ／亩，施肥上限约为４００Ｏｋｇ／亩，在此限以内，每亩每增施１００ｋｇ普通有机肥料，小麦产量平均提高１．７６ｋｇ。水分利用率与施肥量之间呈直线型正效应，每１００ｋｇ普通有机肥能提高水分利用率０．００６２ｋｇ／ｍｍ·亩。

Application of organic fertilizer to rainfed soil can obviously improvecrop yields and water use efficiency. In the semiarid area of the middle part of Gansu,the optimal application of organic fertilizers to wheat is 3068 kg/ mu with the upper limitof organic fertilizer application of 4000 kg/ mu.Within this limit,the increasing applica-tion of common organic fertilizers of every l00kg can increase 1.76 kg of wheat yields onthe average. Water use efficiency with amount of fertilizer application appears to belinear effect.Every per l00 kg of common organic fertilizer applied can raise water useefficiency of 0.0062 kg/mm per mu.