内蒙古民族大学学报（自然科学版）2024，Vol.39Issue(3)：14-18,96,6.DOI:10.14045/j.cnki.15-1220.2024.03.003
连续秸秆还田下氮肥减施对春玉米光合特性及产量的影响
Effects of Nitrogen Fertilizer Reduction on Photosynthetic Characteristics and Yield of Spring Maize Under Continuous Straw Returning
摘要
Abstract
In order to explore the effect of nitrogen fertilizer reduction on photosynthetic characteristics and yield of spring maize under continuous straw returning.In 2023,the plots with no straw returning and straw returning for 8 years were selected in Caijiapu Village,Kailu County,Horchin District,Tongliao City,and four nitrogen appli-cation levels were set up:constant nitrogen application(N4:300 kg/hm2),20%reduction of nitrogen fertilizer(N3:240 kg/hm2),30%reduction of nitrogen fertilizer(N2:210 kg/hm2),and 40%reduction of nitrogen fertilize(N1:180 kg/hm2).The relative chlorophyll content and photosynthetic characteristic parameters of corn ear position were determined at silking stage,and the yield was measured at maturity stage.The results showed that the yield of maize under four nitrogen application levels in 8 years was higher than that without straw returning,and the difference under N2 level was the largest,which was 16.1%higher than that without straw returning.The yield of 30%(N2)was the highest under 8 years of straw returning,which was 13.5%higher than that of normal nitrogen application(N4).The relative contents of Pn,Tr,Cond and chlorophyll in ears of maize were higher than those in straw without returning to the field,and Ci was significantly decreased,and the difference in N2 level was the largest.The contents of Pn,Tr,Cond and chlorophyll in leaves increased significantly after 8 years of straw returning to the field,while the concentration of Ci was lower,and the relative content of chlorophyll did not change significantly compared with N3,which was higher than that of N4 and N1.Therefore,under the same nitrogen application level,the photosynthetic capacity and yield of maize ear leaves in the straw returning field for 8 years were higher than those in the straw non-returning field.The net photosynthetic rate,relative chlorophyll content and yield of N2 level were the highest under 8 years of straw returning.关键词
秸秆还田/氮肥减施/产量/光合特性Key words
straw returning/nitrogen fertilizer reduction/yield/photosynthetic characteristics分类
农业科技引用本文复制引用
吴志宇,张玉芹,杨恒山,金玉,鲁敏媛..连续秸秆还田下氮肥减施对春玉米光合特性及产量的影响[J].内蒙古民族大学学报（自然科学版）,2024,39(3):14-18,96,6.基金项目
国家自然科学基金项目(31960382) （31960382）
