Effects of Integrated Cultivation Mode of Rice Cherax quadricarinatus on Soil Fertility
In order to investigate the effects of the integrated cultivation mode of rice Cherax quadricarinatus on soil fertility,two experimental fields were selected in Jishigang Town,Ningbo City,Zhejiang Province,and the soil fertility changes of the two experimental fields were tracked before and after 1 year,2 years and 3 years of rice and shrimp co-cropping.The results showed that under the current operation mode,with the increase of planting years,the change of soil pH,available phosphorus,available potassium and cation exchange capacity increased by 33.01%,330.18%,30.91% and 29.92% respectively.Soil organic matter decreased by 32.64%,total nitrogen decreased by 33.05% and hydrolyzed nitrogen decreased by 39.24% .On the whole,the changes of pH,available phosphorus,total nitrogen,hydrolyzed nitrogen and organic matter were significant,but the changes of available potassium and cation exchange capacity were not significant.The results of test field No.2 and test field No.1 were basically the same,but the significance was less than that of test field No.1.The current integrated cultivation mode of rice Cherax quadricarinatus was conducive to improving soil pH,available phosphorus,available potassium and cation ex-change capacity,but may lead to the decline of organic matter,total nitrogen and hydrolyzed nitrogen.The operation rules should be further optimized and adjusted in the subsequent promotion process.
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