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

doi:10.3969/j.issn.1004-1524.2021.04.14

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. 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

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

CLC Number:

S511

LI Baoxian, WANG Baojun, HUAI Yan, SHEN Yaqiang, ZHANG Hongmei, CHENG Wangda. Effects of integrated rice-redclaw crayfish farming system on soil nutrients, carbon pool and rice quality[J]. Acta Agriculturae Zhejiangensis, 2021, 33(4): 688-696.

Figures/Tables 5

Fig.1 Variation of monthly mean precipitation and temperature in 2019

Fig.2 Soil nutrients in integrated rice-redclaw crayfish farming system *, ** represented the difference among different treatments was significant at the level of 0.05 or 0.01, respectively.

Fig.3 The carbon pool of integrated rice-redclaw crayfish farming system

Table 1 The rice yield of integrated rice-redclaw crayfish farming system

处理 Treatment	穗数 Panicle number/ (10⁶ hm^-2)	穗粒数 Grains per panicle	千粒重 1 000-grain weight/g	结实率 Seeding rate/%	理论产量 Theoretical yield/ (kg·hm^-2)	实际产量 Actual yield/ (kg·hm^-2)
RS	2.55±0.31 a	157.13±6.72 a	23.54±0.93 b	94.00±0.23 a	8.84±0.68 a	8.36±0.80 a
CK	2.40±0.22 a	148.92±7.97 a	25.94±0.65 a	96.30±0.98 a	8.94±0.87 a	9.74±0.45 a

Fig.4 Effect of integrated rice-redclaw crayfish farming system on rice quality

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

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