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稻草还田是各地早已用作晚稻肥源的一项措施,其改土作用与增产效果如何,我所自1977年至1979年采取田间试验与室内分析相结合的方法进行了一些研究。 一、试验经过与处理 试验在白夹泥田上进行。这种土壤质地粘重,含有机质和有效养分均较低,耕性不良,湿韧干板。1977年插晚稻前用1/2早稻草还田,与不施稻草进行比较,对当季晚稻和后作绿肥的增产效果均十分显著。1979年再根据稻草的主要成分设以下四个处理进行试验分析。 1.不施稻草 2.1/2稻草还田即亩施早稻草300斤(品种广陆矮4号,稻草含二氧化硅11.0％、全钾1.815％、全磷0.343％、全氮0.752％); 3.亩施氯化钾10斤 (相当于300斤稻草的含钾总量);
Rice straw is a measure that has long been used as fertilizer for late rice all over the country. How does its effect on soil improvement and yield increase? Some researches have been conducted on the combination of field experiment and laboratory analysis from 1977 to 1979. First, the test after the test and treatment carried out in white clay. This soil texture sticky, containing organic matter and nutrients are low, poor tillage, wet tough board. In 1977, the rice was planted in the field before the late rice, and compared with no rice straw, the yield increase of late rice and later green manure were all significant. In 1979 and then based on the main components of straw set the following four tests for analysis. (1) The rice straw was applied in a field of 300 kg (the variety of Guangluaai 4, the straw containing 11.0% of silica, 1.815% of total potassium, 0.343% of total phosphorus and 0.752% of total nitrogen) 3 acres of potassium chloride 10 pounds (equivalent to 300 kg straw total potassium);