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根据华北平原农业水资源日趋减少的现状 ,开展了以减少土壤水分蒸发 ,提高水分利用效率为目的的不同培肥措施的节水田间试验。研究结果表明 :秸秆还田具有明显的节水增产效应。在相同灌溉水量 ( 1 50mm)的情况下 ,玉米秸与小麦秸全部还田较不还田 (对照 )增产小麦 540 kg/ hm2 ,仅麦秸还田较对照增产小麦4 65kg。水分利用效率分别提高了 2 .3 4和 2 .3 6kg/ ( hm2 · mm) ;同时增施有机肥可增产小麦 73 5kg/ hm2 与660 kg/ hm2 ,水分利用效率分别提高 2 .2 1和 2 .1 8kg/ ( hm2 · mm)
According to the decreasing status of agricultural water resources in the North China Plain, a field trial of water saving with different fertilization measures to reduce soil water evaporation and improve water use efficiency was carried out. The results show that: straw returning to the field has obvious water-saving and yield-increasing effect. With the same amount of irrigation water (150 mm), corn straw and wheat straw were all returned to the field with no yield (540 kg / hm2) and wheat straw only increased to 655 kg compared with the control. Water use efficiency increased by 23.4 and 23.6kg / (hm2 · mm) respectively. Meanwhile, application of organic manure increased yields of 73 5kg / hm2 and 660kg / hm2 of wheat, and water use efficiency increased by 2.21 and 2 .1 8kg / (hm2 · mm)