广东农业科学2025，Vol.52Issue(3)：66-74,9.DOI:10.16768/j.issn.1004-874X.2025.03.007
四川弱光区直播杂交稻干物质与产量对减量施氮的响应
Effects of Reduced Nitrogen Application on Dry Matter and Yield of Direct-Seeded Hybrid Rice in Low-Light Regions of Sichuan Province
摘要
Abstract
[Objective]To clarify the responses of dry matter and yield of hybrid rice in the hilly areas of northwestern Sichuan to the reduction of nitrogen fertilizer application.[Method]'Jinlongyou 589'and'Shenyouyuehesimiao'were selected as the experimental materials,and three different nitrogen fertilizer treatments were set up.They were the conventional nitrogen application rate of 180 kg/hm2(N2),a 25%reduction in nitrogen application based on the conventional rate,that is,the nitrogen application rate of 135 kg/hm2(N1),and no nitrogen application(N0,0 kg/hm2)as the control.On this basis,chlorophyll,content,nitrate reductase(NR)activity,dry matter accumulation,and yield of hybrid rice under different nitrogen fertilizer reduction treatments were deeply analyzed.[Result]In terms of chlorophyll content,'Shenyouyuehesimiao'was higher than'Jinlongyou 589';while in terms of nitrate reductase(NR)activity,'Shenyouyuehesimiao'was lower than'Jinlongyou 589'.With the decrease of nitrogen application rate,the contents of chlorophyll a and chlorophyll b'and the NR activity of hybrid rice all showed a decreasing trend.The contributions of dry matter and post-heading dry matter accumulation to grains of'Shenyouyuehesimiao'increased by 23.69%and 0.59%respectively compared with those of'Jinlongyou 589'.Treatment N1 led to a decrease in the dry matter accumulation of hybrid rice.Under treatment N2,the contributions of post-heading dry matter accumulation to grains and the population growth rate of'Shenyouyuehesimiao'both reached the maximum values.The effective panicle number and 1000-grain weight of'Shenyouyuehesimiao'were higher than those of'Jinlongyou 589'.Meanwhile,the effective panicle number,filled grain number,seed setting rate,and 1000-grain weight of the two hybrid rice varieties all decreased with the reduction of nitrogen fertilizer application rate.In terms of yield,under treatment N2,the yield of'Shenyouyuehesimiao'was 10 300.0 kg/hm2,and the yield of'Jinlongyou 589'was 8 879.6 kg/hm2;under treatment N1,the yield of'Shenyouyuehesimiao'was 9 818.72 kg/hm2,and the yield of'Jinlongyou 589'was 8 495.03 kg/hm2.Compared with treatment N1,the yields of'Shenyouyuehesimiao'and'Jinlongyou 589'under treatment N2 increased by 4.9%and 4.5%respectively,but the difference was not significant.[Conclusion]In the hilly areas of northwestern Sichuan,controlling the nitrogen application level in the production of'Jinlongyou 589'and'Shenyouyuehesimiao'at 135 kg/hm2 is expected to achieve the coordinated development of yield improvement and green ecology.关键词
杂交稻/氮肥减施/生理指标/干物质/产量/生长率/绿色生态Key words
hybrid rice/nitrogen fertilizer reduction/physiological indicators/dry matter/yield/rate of growth/green ecology分类
农业科技引用本文复制引用
王然,鄢圣敏,马鹏,赫倩歌,王熙媛,王菲,汤自翔,赵胜利,邓俊,丁建明,张荣萍..四川弱光区直播杂交稻干物质与产量对减量施氮的响应[J].广东农业科学,2025,52(3):66-74,9.基金项目
国家重点研发计划项目(2017YFD0301701,2017YFD0301706) （2017YFD0301701,2017YFD0301706）
四川省育种攻关专项(2016NYZ0051) （2016NYZ0051）
