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Increasing the appropriate seedling density for higher yield in dry direct-seeded rice sown by a multifunctional seeder after wheatstraw return

引用

Journal of Integrative Agriculture 2023年第2期22卷 400-416页

作者： TIAN Jin-yu LI Shao-ping CHENG Shuang LIU Qiu-yuan ZHOU Lei TAO Yu XING Zhi-peng HU Ya-jie GUO Bao-wei WEI Hai-yan ZHANG Hong-cheng Jiangsu Key Laboratory of Crop Cultivation and Physiology/Innovation Center of rice Cultivation Technology in Yangtze Valley Ministry of Agriculture and Rural Affairs/Co-Innovation Center for Modern Production Technology of Grain CropsYangzhou UniversityYangzhou 225009P.R.China Agricultural College Xinyang Agriculture and Forestry UniversityXinyang 464000P.R.China

dry direct-seeded rice(DDR) sown using a multifunctional seeder that performs synchronous rotary tillage and sowing has received increased attention because it is highly efficient,relatively cheap,and environmentally ***,this method of rice production may produce lower yields in a rice–wheat rotation system because of its poor seedling *** address this problem,we performed field experiments to determine the rice yield at five seedling density levels(B1,B2,B3,B4,and B5=100,190,280,370,and 460 seedlings m-2,respectively) and clarify the physiological basis of yield *** selected a representative high-quality rice variety and a multifunctional seeder that used in a typical rice–wheat rotation area in 2016 and *** proportion of main stem panicle increased with increasing seedling *** was a parabolic relationship between yield and seedling density,and the maximum yield(9.34-9.47 t ha-1) was obtained under *** maximum yield was associated with a higher total spikelet number m-2 and greater biomass accumulation from heading to *** higher total spikelet number m-2 under B3 was attributed to an increase in panicle number m-2 compared with B1 and *** the panicle numbers also increased under B4 and B5,these increases were insufficient to compensate for the reduced spikelet numbers per *** biomass,smaller leaf area,and lower N uptake per plant from the stem elongation stage to the heading stage were partially responsible for the smaller panicle size at higher seedling density levels such as *** higher biomass accumulation under B3 was ascribed to the increases in the photosynthetic rate of the top three leaves m-2 of land,crop growth rate,net assimilation rate,and leaf area ***,the B3 rice population was marked by a higher grain–leaf ratio,as well as a lower export ratio and transport ratio of biomass per stem-sheath.A quadratic function predicted that 260-290 seedlings m-2 is the op

关键词： seedling density dry direct-seeded rice sown by a multifunctional seeder rice–wheat rotation system yield biomass photosynthetic capacity

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