覆盖对长期免耕桑园土壤某些肥力性状的影响

Effect of Covering Straw on Some Properties of Mulberry Soil Fertility With Long-term No-tillage

应用田间试验的方法研究在长期免耕条件下覆盖对桑园土壤某些肥力性状的影响。试验结果显示 :从同一处理 ,无论覆盖与否其土壤有机质、全氮及速效氮的含量均为上层 (0～ 2 0cm)大于下层 (2 0～ 4 0cm) ;同一土层不同处理 ,上述养分含量均为覆盖大于不覆盖 ;覆盖处理的土壤微生物量、最大田间持水量比不覆盖处理分别增加了4 5 4 %、5 0 9% ;覆盖可以使土壤变得疏松 ,通透性得到一定程度的加强。

This paper took field experiment for studying the effect of covering straw on some properties of mulberry soil fertility with long-term no-tillage.It has been observed that the contents of soil orgainc-C,total N and quickly available N of upper layer(0～20 cm) are higher than that of lower layer(20～40 cm)in the same treatment,while upper layer or lower layer those of soil with cover treatment are higher than that of lower layer.The microbial biomass and maximum field capacity of soil with cover treatment are incresed by 4.54% and 5.09% respectively.Finally,the test alos found that covered with straw could make soil more loose.