Effects of integrated rice-crayfish model on soil reducing substances and rice yield under optimized water management
In order to provide scientific basis for scientific water management of rice and soil improvement,the effects of integrated rice-crayfish model on rice yield and soil reducing substances under optimized water management were explored.The water optimal management treatment mainly based on the measures of twice heavy sunning in the late tillering stage and mature stage of rice and the water conventional management treatment mainly based on the measures of twice light sunning in the late tillering stage and mature stage of rice were set up,respectively,and the relevant research was carried out in Qianjiang city,Hubei province,using the field positioning test.The results showed that the average yield of optimized water management was 8.5%,higher than that of conventional management under the condition of direct seeding of rice,and the average yield of optimized water management was 9.4%,higher than that of conventional management under the condition of mechanical transplanting of rice,both of which reached a significant level for the gleyed paddy fields.The yield increase effect of optimal water management on high quality indica rice was better than that on high quality japonica rice.Compared with conventional management,the positive effects of water optimal management on effective panicles and grains per panicle were greater than seed setting rate and 1000 grain weight.At the late tillering stage of rice,compared with conventional management,the content of ferrous iron in 0-10 cm soil layer was decreased by 40.8%-41.8%,and the total amount of reducing substances in 0-20 cm soil layer was decreased by 45.1%-46.4%.Compared with the late tillering stage,the total amount of ferrous and reducing substances in the 0-20 cm soil layer after rice harvest showed a decreasing trend.In conclusion,water optimization management measures such as gleying rice field under integrated rice-crayfish mode,twice sun drying at the late tillering stage and mature stage could significantly increase rice yield and alleviate the degree of soil gleization.
integrated rice-crayfish modeoptimized water managementsoil reducing substances
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