Effects of Straw Incorporation Supplying Silicon on Grain Yield and Silicon Absorption of Double Cropping Rice Under Chemical Fertilizer Reduced
ZENG Yanhua;WU Jianfu;FAN Chenggen;ZENG Yongjun;TAN Xueming;PAN Xiaohua;SHI Qinghua;Key Laboratory of Crop Physiology,Ecology and Genetic Breeding,Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice,Jiangxi Agricultural University;
The long-term field experiment on straw incorporation and soil fertility( Wenzhen town,Jinxian county,Jiangxi province) was located the cultivated land quality monitoring system. The objective of the study was to explore the effects of straw incorporation supplying silicon on grain yield and silicon absorption of double cropping rice under chemical fertilizers reduced in the long run. Six treatments were included: total straw incorporation and reducing inorganic fertilizers application( SI + NPK),straw burning and reducing inorganic fertilizers application( SB + NPK),inorganic fertilizers alone application( NPK),total straw incorporation and no chemical fertilizer( SI),straw burning and no chemical fertilizer( SB),and straw non-incorporation and no chemical fertilizer( CK). Grain yield,biomass and silicon absorption were determined. The results showed that SI + NPK could increase grain yield,biomass of double cropping early and late rice,that the effect of yield increasing was higher in early rice than late rice. There was significant difference between SI and SB in non-fertilizer block. The average grain yield of early rice for the 6 years under SI + NPK treatment was increased from 2. 86% to 6. 38% ,compared to SB + NPK,NPK; and was increased 2. 80 percentage of late rice,compared to NPK. There was held the same grain yield between SI + NPK and SB + NPK. SI + NPK could increase the content of silicon of early rice and that of late rice at late growth stage. Compared with SB + NPK and NPK treatments,SI + NPK also increased significantly the silicon accumulation of double cropping rice. The periodic silicon accumulation of each growth period in early rice was higher in SI + NPK than in SB + NPK,NPK,and there was significantly different between SI + NPK and NPK. SI + NPK also increased significantly the periodic silicon accumulation from tillering stage to panicle initiation,and from heading stage to maturity stage in late rice,compared to NPK. There was a positive relationship between the periodic silicon accumulation of each growth period and grain yield.The periodic silicon accumulation of earlier growing stage was the basis of the increase production of rice. The study was supported for the reasonable utilization of straw resource,high yield of double cropping rice and its silicon management measure in southern rice zone.
【Fund】： 国家科技支撑计划(2013BAD07B12);; 国家重点研发计划(2016YFD0300501 2017YFD0301605);; 江西省科技支撑计划重点项目(2009BNA03800);; 中国博士后科学基金面上项目(2016M600512)
【CateGory Index】： S511.42
【CateGory Index】： S511.42