有机肥对提高旱地作物利用土壤水分的作用机理研究

Study on the Mechanism of the Role of Organic Fertilizer in Increasing Crop Water Use Efficiency

干旱半干旱耕地施用有机肥可提高作物抗旱能力,有机肥与氮、磷、钾配合施用,可提高化肥利用率,增加产量。不同处理对作物的分蘖、株高、亩穗数、穗粒数、千粒重、亩产量均有一定的影响。在有机养分量相近时,可实现产量的最大值。有机肥可提高土壤有机无机复合量,但复合度下降,在有机无机配合施用时复合度明显增高,产量也大幅度增加。明确了决定土壤肥力的是土壤有机质和有机无机复合度两个指标。

Applying organic fertilizer in arid and semi arid land can increase crop s drought resistance. Combined application of organic fertilizer with N. P. K can improve fertilizer use efficiency and increase crop s yield. All treatments had a certain degree of effect on number of tillers, plant height, spikes per mu,grain number per spike, 1000-grain weight and yield.Organic fertilizer can improve organic/inorganic compound capacity but reduce the organic/inorganic compound degree. In the organic/ inorganic combined application, the compound degree increased significantly and crop yield increased remarkably, It was clarified that the two indicators determining soil fertility were soil organic matter and organic/inorganic compound degree.