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紫云英是我国南方稻田传统的有机肥料,近年来更逐渐北移。随着化学氮肥增加,有些地区紫云英播种面积有所减少,但在红壤地区以及某些水稻区,紫云英仍是水稻的一项重要肥源。研究紫云英在土壤中的腐解、养分转化及对土壤肥力和水稻生育的影响具有一定实践意义。我们于1980年利用~(15)N标记与非标记的紫云英进行了水稻田间小区、微区及温室盆栽等试验,现将所得结果整理如下。
Astragalus is the traditional organic fertilizer in paddy fields in southern China, and has gradually moved northward in recent years. With the increase of chemical nitrogen fertilizer, the sown area of Astragalus sinicus decreased in some areas. However, it is still an important source of rice in red soil area and some rice areas. Study on Astragalus in soil decomposition, nutrient transformation and the impact on soil fertility and rice growth has some practical significance. We used ~ (15) N-labeled and non-labeled asparagus in 1980 to conduct paddy field plots, micro-areas and greenhouse pot experiments, and the results are summarized below.