华北农学报2024，Vol.39Issue(4)：170-178,9.DOI:10.7668/hbnxb.20194822
主季减氮增密对再生稻产量形成特性的影响
Effect of Reducing Nitrogen and Increasing Density in the Main Season on Yield Formation Characteristics of Ratooning Rice
摘要
Abstract
In order to investigate the effect of reducing nitrogen and increasing density on the yield formation characteristics of ratooning rice,hybrid rice variety Chuangliangyou 669 was used as the material to conduct two years of field experiments under conditions of three nitrogen application rates(N1:180 kg/ha;N2:153 kg/ha;N3:126 kg/ha)and two plant row spacing(M1:20.0 cm × 16.7 cm;M2:16.7 cm×16.7 cm).The results showed that:reducing nitrogen reduced the leaf area index(LAI)of ratooning rice,but increasing density within a reasonable range of nitrogen reduction could increase the LAI of the main and ratooning seasons.The LAI of N1M2 and N2M2 was higher in the interaction treatments.Reducing nitrogen and increasing density both reduced the SPAD value of ratooning rice leaves,but the effect of density was not significant.Reducing nitrogen led to a decrease in dry matter weight,while increasing density could significantly increase dry matter weight.The interaction treatment of N1M2 and N2M2 had a higher dry matter weight.Reducing nitrogen reduced the yield of ratooning rice,but increasing density within a reasonable range of nitrogen reduction could increase yield.The interaction treatment of N1M2 and N2M2 had a higher yield.Reducing nitrogen significantly reduced the number of effective panicles in the main sea-son,the total number of grains per panicle,and the regeneration rate and number of effective panicles in the ratoo-ning season.However,increasing density had a compensatory effect on the number of panicles.Reasonable nitrogen reduction and density increase(N2 M2)could coordinate the relationship among yield components and achieve high-er yields.The correlation analysis showed that reasonable nitrogen reduction and density increase increased the ef-fective number of panicles and total grains per panicle in the main season,as well as the effective number of pani-cles in ratooning season mainly by increasing LAI and dry matter weight of the main and ratooning season,and thereby improving the yield of ratooning rice.Overall,the nitrogen reduction and density increase treatment N2M2(nitrogen rate of 153 kg/ha,plant row spacing of 16.7 cm × 16.7 cm)can save 15％nitrogen and achieve a higher yield.关键词
再生稻/氮肥/密度/产量Key words
Ratooning rice/Nitrogen/Density/Yield分类
农业科技引用本文复制引用
郑德超,田琴琴,王罕,陈秋红,黄新杰,易镇邪..主季减氮增密对再生稻产量形成特性的影响[J].华北农学报,2024,39(4):170-178,9.基金项目
湖南省重点研发计划项目(2023NK2004) （2023NK2004）
湖南省自然科学基金部门联合基金项目(2023JJ60227) （2023JJ60227）
湖南省自然科学基金面上项目(2022JJ30303) （2022JJ30303）
