浙江农业学报2025，Vol.37Issue(5)：987-997,11.DOI:10.3969/j.issn.1004-1524.20240412
氮肥运筹对旱直播稻地上部微量元素吸收分配的影响
Effects of nitrogen management on absorption and allocation of microelements in above-ground parts of dry direct-sowing rice
摘要
Abstract
To investigate the effects of nitrogen(N)management on micronutrient absorption and utilization in aboveground parts of dry direct-sowing rice,this study examined how nitrogen application time and application rate influence the absorption-translocation efficiency and partition ratio of four microelements(Fe,Cu,Mn,Zn)in a-bove-ground parts.A split-plot design was adopted with nitrogen application stages as main plots(D1:basal applica-tion at sowing followed by topdressing at 3-leaf-1-heart stage,7 days later,and panicle initiation;D2:initial appli-cation at 1-leaf-1-heart stage followed by topdressing at 3-leaf-1-heart stage and panicle initiation;D3:application at 3-leaf-1-heart stage followed by topdressing at panicle initiation)and nitrogen application rate as subplots(F1:350 kg·hm-2 pure N;F2:297.5 kg·hm-2 pure N;F3:245 kg·hm-2 pure N),each treatment had three replicates.The results showed that D2 treatment significantly enhanced Fe and Cu translocation efficiency in leaves compared to D1 and D3 treatments,with Fe efficiency 3.15 and 8.12 percentage points higher,and Cu efficiency 7.64 and 4.57 percentage points higher,respectively.F2 treatment significantly increased Fe and Zn contents in leaves at heading stage compared to F1 and F3.F2 also demonstrated significantly higher Fe,Cu,and Zn translocation efficiency in leaves and leaf sheaths,leading to greater spike partition ratio of these micronutrients.D1F2 combination achieved the highest spike partition ratio for Fe,Mn and Zn.These findings indicated that both nitrogen application time and application rate affect microelements absorption-translocation patterns in dry direct-sowing rice.Delaying initial nitro-gen application to 1-leaf-1-heart stage followed by two topdressings enhanced Fe and Cu translocation in leaves.Ap-plication rate of 297.5 kg·hm-2 pure N promoted Fe and Zn accumulation during heading and their subsequent trans-location to spikes.The fertilization mode combining basal application at sowing with three subsequent topdressings(297.5 kg·hm-2 pure N)effectively improves Fe,Mn and Zn distribution rates in spikes at maturity stage.关键词
氮肥运筹/旱直播稻/微量元素/吸收/分配Key words
nitrogen fertilizer management/dry direct-sowing rice/mineral element/absorption/allocation分类
农业科技引用本文复制引用
刘奇华,孙召文,郑崇珂..氮肥运筹对旱直播稻地上部微量元素吸收分配的影响[J].浙江农业学报,2025,37(5):987-997,11.基金项目
山东省重点研发计划(农业良种工程)项目(2023LZGC021) （农业良种工程）
山东省重点研发计划(重大科技创新工程)项目(2021TZXD005) （重大科技创新工程）
国家重点研发计划(2022YFD1201701) （2022YFD1201701）
山东省农业良种工程项目(2019LZGC003) （2019LZGC003）
