Analysis on Yield Components and Economic Efficiency of Ratoon Rice under Simplified Cultivation in Southeast Sichuan Province
Received date: 2020-10-13
Online published: 2021-01-20
In order to clarify the effects of simplified cultivations （conventional tillage and transplanting, CTTP;conventional tillage and direct seeding, CTDS; no-tillage and transplanting, NTTP）on yield components and economic efficiency in rice-ratoon rice system, a field experiment with two cultivars（Huanghuazhan and Jinnongsimiao） was conducted in Luzhou in 2017. The characteristics of biomass production, yield and yield components and economic efficiency of first season rice and ratoon rice were analyzed. The results showed that there was no significant difference in grain yield of first season rice among three cultivation methods. The grain yield of first season rice under CTDS was 3.5% higher than CTTP. The grain yield of first season rice under NTTP was equivalent to CTTP. The trend of the ratoon rice yield was CTTP>NTTP>CTDS, but the difference were not significant. Compared with CTTP, the first season rice under CTDS was characterized by more panicles per unit area but less spikelets per panicle, higher dry matter weight but lower harvest index at maturity; the ratoon rice under CTDS was characterized by more panicles per unit area but less spikelets per panicle and lower seed setting rate. The difference in effective panicles, spikelets per panicle, seed setting rate, thousand grain weight, dry matter weight and harvest index were relatively small between NTTP and CTTP. There were no significantly difference in output value among different cultivation methods, but the difference of economic benefits were large. Compared with CTTP, the economic benefits of CTDS and NTTP were increased by 0.4% and 6.2%, respectively. In conclusion, increasing panicles per unit area and thousand grain weight may be the feasible approach to achieve high yield for first season rice, and improving panicles per unit area, seed setting rate and thousand grain weight may be the feasible approach to achieve high yield for ratoon rice. Simplified cultivation technique has the advantages of saving cost, saving labor and high economic benefit, and has great development prospects in southeast Sichuan.
Key words： simplified cultivation; ratoon rice; economic efficiency; grain yield
Peng JIANG, Hong ZHOU, Fuxian XU, Hong XIONG, Lin ZHANG, Yongchuan ZHU, Xingbing ZHOU, Xiaoyi GUO, Mao LIU . Analysis on Yield Components and Economic Efficiency of Ratoon Rice under Simplified Cultivation in Southeast Sichuan Province[J]. China Rice, 2021 , 27(1) : 80 -84 . DOI: 10.3969/j.issn.1006-8082.2021.01.015
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