Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (4): 688-696.DOI: 10.3969/j.issn.1004-1524.2021.04.14

• Environmental Science • Previous Articles     Next Articles

Effects of integrated rice-redclaw crayfish farming system on soil nutrients, carbon pool and rice quality

LI Baoxian1(), WANG Baojun2, HUAI Yan1, SHEN Yaqiang2, ZHANG Hongmei2, CHENG Wangda2,*()   

  1. 1. Zhejiang Agro-Tech Extension and Service Center, Hangzhou 310020, China
    2. Institute of Eco-Environmental Sciences, Jiaxing Academy of Agricultural Science, Jiaxing 314016, China
  • Received:2020-07-08 Online:2021-04-25 Published:2021-04-25
  • Contact: CHENG Wangda

Abstract:

The integrated rice-shrimp farming systems has been greatly developed in recent years. Redclaw crayfish, a type of valuable freshwater economic shrimps, has a broad development prospect. The study of soil nutrients, carbon pool and rice quality in the integrated rice-redclaw crayfish farming system is of great significance for fertilization management and regulation of the soil nutrient cycling and balancing. In this study, the field experiment was conducted to study the dynamic changes of soil nutrients and carbon pool and rice quality under the integrated rice-redclaw crayfish farming system and rice monoculture pattern. Results showed that the contents of soil ammonia nitrogen and soil available phosphorus significantly (P<0.05) increased by 24.16% and 48.10% under integrated rice-redclaw crayfish farming system during the whole growth period. The contents of soil nitrate nitrogen, available potassium, easy oxidation of organic carbon, dissolved organic carbon and microbial organic carbon was reduced by 1.00%, 16.40%, 3.93%, 16.59% and 52.80%, respectively, compared with the rice monoculture pattern. In terms of rice yield and quality, the rice-redclaw crayfish farming system could reduce yield, but the chalkiness of rice could be reduced, and the rice quality was better than that of rice monoculture pattern. In conclusion, under the experimental conditions, the integrated rice-redclaw crayfish farming system could increase soil ammonia nitrogen and available phosphorus content, reduce the content of active carbon pool in the rice field. Besides, the integrated rice-redclaw crayfish farming system could reduce the chalkiness of rice and improve the rice quality.

Key words: integrated rice-redclaw crayfish farming system, nutrient, carbon pool, yield, rice quality

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