氮肥运筹对水稻根系生长发育的影响及其与氮肥吸收利用的关系  

Effects of Nitrogen Fertilizer Management on Rice Root Growth and Development and Its Relationships with Nitrogen Fertilizer Uptake and Utilization

作　　者：胡锐 胡香玉 傅友强[1] 叶群欢 潘俊峰[1] 梁开明[1] 李妹娟 刘彦卓[1] 钟旭华[1] Hu Rui;Hu Xiangyu;Fu Youqiang;Ye Qunhuan;Pan Junfeng;Liang Kaiming;Li Meijuan;Liu Yanzhuo;Zhong Xuhua(Rice Research Institute,Guangdong Academy of Agricultural Sciences/Guangdong Key Laboratory of New Technology in Rice Breeding/Guangdong Rice Engineering Laboratory,Guangzhou 510640,Guangdong,China)

机构地区：[1]广东省农业科学院水稻研究所/广东省水稻育种新技术重点实验室/广东省水稻工程实验室,广东广州510640

出　　处：《作物杂志》2023年第5期179-186,共8页Crops

基　　金：国家级科技成果奖励培育专项(粤农科研〔2018〕45号);广东省农业科学院创新基金项目(202105);广东省农业科学院导师制项目(R2020QD-002);广东现代农业产业技术体系水稻创新团队(2021KJ105);广东省自然科学基金(2021A1515010617,2022A1515012313);广东省重点实验室运行费(2020B1212060047)。

摘　　要：水稻“三控”施肥技术是一项氮肥优化管理技术。采用田间试验对三控施肥法(TC)与农民习惯施肥法(FP)处理下的水稻根系形态指标、根系活力、氮素吸收利用、干物质积累和产量等性状进行测定。TC早季和晚季总施氮量分别为150和180kg N/hm^(2),FP分别为180和210kg N/hm^(2)。TC氮肥按照基肥40%、保蘖肥20%、穗肥30%、粒肥10%施用,FP氮肥按照基肥30%、回青肥20%、分蘖肥30%、长粗肥(移栽后18~20d施入)20%的比例施用。结果表明,2019和2020年TC氮素吸收利用率分别比FP提高25.9和15.2个百分点,氮素农学利用率分别提高89.6%和74.4%,氮肥偏生产力分别提高30.8%和38.3%;TC处理的水稻孕穗期根长、根系表面积和根系体积均显著高于FP,孕穗期的根系活力2年分别比FP高41.6%和13.6%。2019年TC处理的水稻分蘖期根冠比显著高于FP。相关性分析显示,氮素吸收利用率与孕穗期根系活力呈显著正相关,氮素农学利用率与孕穗期根长、根干重呈显著正相关,氮肥偏生产力与孕穗期根系表面积呈显著正相关。研究结果表明,促进水稻生育中期的根系发育及活力是三控施肥法氮利用效率提高的生理基础。The“Three Controls”nutrient management technology(TC)of rice is an optimized nitrogen management fertilization technology.Field experiments were conducted with TC and farmers’fertilization practice(FP)as treatments.Root morphological traits,root activity,nitrogen uptake,dry matter accumulation,and grain yield were investigated.Under TC treatment,the total nitrogen input was 180kg N/ha in the late season and 150kg N/ha in the early season,respectively.Under FP treatment,the total nitrogen input was 210kg N/ha in the late season and 180kg N/ha in the early season,respectively.TC nitrogen fertilizer was applied according to base fertilizer 40%,tillering fertilizer 20%,ear fertilizer 30%,grain fertilizer 10%.FP nitrogen fertilizer was applied according to the proportion of base fertilizer 30%,return fertilizer 20%,tillering fertilizer 30%,long coarse fertilizer(applied 18-20d after transplanting)20%.The results showed that compared to FP,the nitrogen recovery efficiency of TC was increased by 25.9 and 15.2 percentage points in 2019 and 2020,respectively.The nitrogen agronomic efficiency was increased by 89.6%and 74.4%in 2019 and 2020,respectively.Compared to FP,the partial factor productivity of TC was increased by 30.8%and 38.3%in 2019 and 2020,respectively.The root length,root surface area and root volume at booting stage of TC were significantly higher than those of FP.Compared to FP,the root activities of TC at booting stage were increased by 41.6%and 13.6%in 2019 and 2020,respectively.The root-shoot ratio of TC at tillering stage was significantly higher than that of FP in 2019.Correlation analysis results indicated that nitrogen recovery efficiency was positively correlated with the root vigor at booting stage.Nitrogen agronomic efficiency was positively correlated with the root length and root dry weight at booting stage.Partial factor productivity of nitrogen was positively correlated with root surface area at booting stage.These results indicated that the enhanced root growth and root vigor during pani

关 键 词：水稻 氮肥运筹 三控施肥技术 氮利用效率 根系 

分 类 号：S511[农业科学—作物学]