摘要
通过棉花膜下滴灌不同施氮策略对产量及氮素养分和叶绿素值相关性的影响研究,为膜下滴灌精准施氮技术提供理论依据。在田间分别设2个施N量水平,3个追氮比例,共6个处理,比较产量差异,并采用SPAD-502叶绿素仪测定分析SPAD值和土壤碱解氮变化特征。结果表明:360kg/hm2的施氮量可获得3040.5kg/hm2的高产,但3个追氮比例策略对产量影响差异小,240kg/hm2的施氮量下3个追氮比例策略对产量影响差异显著;240kg/hm2施氮量的SPAD值整体较低,3个追氮比例策略在蕾期以后的SPAD值差异不显著,而360kg/hm2施氮量处理在蕾期以后的SPAD值差异显著;高产棉花需肥规律的推荐比例的SPAD值与土壤碱氮相关性R2值达到0.9367的最高水平。结论:充足供氮时,调整追氮比例对高产影响不大;供氮不足不易获得高产,但调整追氮比例有一定的增产空间;施氮肥充足并按照棉花需肥规律的推荐比例施氮,可延缓棉花早衰失绿,形成高产。
Through the cotton drip irrigation of different N strategy and nitrogen nutrient and chlorophyll value related to drip irrigation precise N technology to provide the theory basis.In the field of 2 levels N were set up,3 amount of nitrogen topdressing proportion,6,and compares the differences,and the output SPAD-502 chlorophyll analyzer to measure changes SPAD value and soil alkali-hydro nitrogen analysis.Results showed that：360 kg/hm2 nitrogen can obtain 3040.5 kg/hm2 production,but three chasing nitrogen proportion strategy on small differences 240 kg/hm2,nitrogen topdressing nitrogen under 3 percentage of yield significant influence strategy,240 kg/hm2 of nitrogen SPAD lower overall value,3 chasing nitrogen proportion strategy in the later stage SPAD value difference was not significant,but 360 kg/hm2 of nitrogen treatment in the later stage SPAD significant value.The law requiring fertilizer cotton yield ratio of SPAD recommended and soil alkali-hydro nitrogen correlation to the highest value 0.9367R 2 level.Enough,when adjusted for nitrogen topdressing nitrogen to high proportion of little impact.For nitrogen deficiency to yield,but there must be adjusted chasing nitrogen proportion of production space.Nitrogen fertilizer according to sufficient cotton and regularity of proportion of nitrogen recommendations,can delay the cotton is green,premature senility lost high.
出处
《中国农学通报》
CSCD
北大核心
2011年第3期124-129,共6页
Chinese Agricultural Science Bulletin
基金
国家"十一"科技支撑计划项目"棉花持续优质高效生产技术体系研究与示范"(2006BAD21B02-1)
"棉花膜下滴灌关键技术及水盐调控技术开发与示范"(200731137-1)
新疆"十一五"重大专项"棉花生产关键技术开发
集成与示范"(200731133-1)
关键词
施N策略
膜下滴灌
产量
SPAD值
碱解氮
application of N strategy
mulch drip irrigation
yield
SPAD value
soil alkali-hydro nitrogen
