促根剂对太湖地区水稻生长、产量及氮素利用的影响  

Effects of Fertilizer Additive on Rice Growth,Yield and Nitrogen Utilization in Taihu Lake Region

作　　者：杨晓云[1,2] 李文军[1,2] 颜晓元[1] 

机构地区：[1]土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008 [2]中国科学院研究生院,北京100049

出　　处：《土壤》2012年第2期208-212,共5页Soils

基　　金：国家973计划项目(2009CB118600-973);中国科学院知识创新工程重要方向项目(KZCX2-YW-440)资助

摘　　要：为研究一种促根剂对太湖地区水稻生长及氮肥利用的影响,设置添加促根剂和不添加促根剂两种处理,在5个施氮水平下分别测定水稻的生物量、产量和氮素利用率。结果表明:在相同施氮水平下促根剂可以增加水稻生物量,其中在施氮量150、200、250 kg/hm^2施肥水平下,抽穗期和灌浆期地上部生物量的增加幅度分别为17.95%、8.63%、11.09%和2.16%、12 13%、11.47%,存在显著性差异;促根剂明显增加了拔节期水稻根系干重,由低到高各施氮水平下的增幅依次为27.40%、8.52%、26.12%、6.85%、7.21%。促根剂有一定的增产效果,并且在氮肥用量大时效果更为明显。在250 kg/hm^2施肥水平,促根剂处理比不添加促根剂的处理增产5.79%,达到显著性差异水平。促根剂在一定程度上提高了水稻吸氮量、氮素农学利用率、氮素吸收利用率,高氮肥施用水平下表现明显,250 kg/hm^2下分别高出不添加促根剂的处理7.14%、33.26%、10.91%。A field experiment was conducted in Taihu Lake region to study the effect of a fertilizer additive on rice growth,yield and nitrogen use efficiency.The results showed that the fertilizer additive significantly increased rice biomass by 17.95%,8.63%and 11.09%at heading stage and by 2.16%,12.13%and 11.47%at filling stage respectively for N application rates of 150,200 and 250 kg/hm2 respectively.This fertilizer additive also significantly increased root biomass by 7.21%- 27.40%at elongation stage under different N application rates.Yield increase was not as high as biomass,but increased significantly under 250 kg/hm^2 treatment,being 5.79%.The fertilizer additive apparently increased rice N uptake,agronomic N use efficiency（AE） and apparent N recovery efficiency（NRE）,and the increase was significant under high N application rate,being 7.14%, 33.26%and 10.91%respectively under 250 kg/hm^2 treatment.

关 键 词：促根剂 水稻 生长 产量 氮素利用率 

分 类 号：S511.4[农业科学—作物学] S143.1