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近年来,各地随着耕作制度的改变,复种指数提高,秋播紫云英的面积渐趋缩小。同时双晚田紫云英的鲜草产量一般又较低,因此水田有机肥来源明显感到不足,难以满足提高产量以及培肥土壤的要求。另一方面,连年绿肥双季稻连作的结果,土壤缺乏耕翻晒垡的机会,长期处于湿润状态,使土壤产生次生潜育化,出现青泥层,有机质不易分解,养分释放迟缓,往往造成水稻坐棵迟发。这些现象在质地粘重的青泥土上,表现尤为明显。为此,我们于1978～1980年进行了连续三年的稻草还田结合冬耕晒垡定位试验,取得了较为显著的效果。现将试验研究结果,概述如下。
In recent years, with the change of tillage system and the multiple cropping index, the area of autumnal asparagus gradually narrowed. At the same time, the production of fresh grass in Shuangyin Ying and Shuangyin was lower than that in the same field. Therefore, the source of organic fertilizer in paddy field was obviously insufficient and it was difficult to meet the requirements of increasing yield and fertilizing soil. On the other hand, successive years of green manure double cropping rice results, the lack of soil tillage drying sun opportunity, long-term in a wet state, so that secondary soil gleization, the emergence of green layer, organic matter is not easy to break down, slow release of nutrients, often resulting Rice sit late. These phenomena are particularly evident on green clay with a thick texture. To this end, we carried out in 1978 ~ 1980 for three consecutive years straw combined with winter tillage drying positioning test, and achieved remarkable results. The experimental results are summarized below.