Effects of fertilizer application rate on yield, nutrient uptake and soil chemical properties of Exiang 2 under rice-crayfish co-cropping mode

doi:10.14088/j.cnki.issn0439-8114.2026.05.016

Abstract

Abstract: To determine the appropriate nitrogen application rate for Exiang 2 rice under rice-crayfish co-cropping mode, a field fixed-site experiment was conducted from 2019 to 2021, with five fertilizer treatments (CK,T1~T4) set up, in which the nitrogen application rates were 0, 75, 120, 165 and 210 kg/hm², respectively, and the effects of different fertilizer application rates on rice yield and its components, plant nutrient accumulation and soil physicochemical properties were systematically analyzed. The results showed that with the increase of fertilizer application rate on Exiang 2, the actual harvested yield of rice showed an increasing trend, and when the fertilizer application rate reached 276.0 kg/hm², the actual harvested yield of rice was significantly higher than that of the control; further increasing the fertilizer application rate (treatments T3 and T4) did not result in a significant difference in actual harvested yield compared with treatment T2. The main way to achieve yield increase for Exiang 2 was to increase the number of effective panicles.The accumulations of nitrogen, phosphorus and potassium in grain and straw all showed an increasing trend with the increase of fertilizer application rate. Fertilization significantly increased the contents of soil available phosphorus and available potassium, but had little effect on pH, organic matter and alkali-hydrolyzable nitrogen. Considering yield, nutrient uptake and soil fertility maintenance comprehensively, the recommended economic fertilizer application rate for Exiang 2 under rice-crayfish co-cropping mode was 345.3-447.3 kg/hm², of which the economic application rates of N, P₂O₅ and K₂O were 150.1-194.5 kg/hm², 75.1-97.2 kg/hm² and 120.0-155.6 kg/hm², respectively.

Key words: rice-crayfish co-cropping mode, fertilizer application rate, Exiang 2, rice yield, nutrient uptake, soil chemical properties

CLC Number:

S174.2

LIU Yu-hua, LI Jia-ying, SI Guo-han, ZHAO Shu-jun, PENG Cheng-lin. Effects of fertilizer application rate on yield, nutrient uptake and soil chemical properties of Exiang 2 under rice-crayfish co-cropping mode[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(5): 99-104.

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