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Effects of Water and Nitrogen Supply on Dry Matter Accumulation,Nutrient Uptake and Distribution in Greenhouse Winter-spring Cucumber
Author(s): 
Pages: 230-238
Year: Issue:  5
Journal: Acta Agriculturae Boreali-Sinica

Keyword:  水氮供应干物质积累养分吸收水氮利用效率黄瓜;
Abstract: 采用田间小区试验方法,研究了日光温室膜下沟灌模式下,不同水氮供应对冬春茬黄瓜不同生育时期及各个器官干物质积累量、氮磷钾吸收及分配规律、水氮利用效率和产量的影响.结果表明,冬春茬黄瓜干物质积累与氮磷钾养分吸收规律一致,均呈“S”曲线,结瓜期是干物质积累和养分吸收的关键时期.不同水氮供应对根系干物质积累与分配影响差异不显著,主要影响叶片、茎和果实的积累.结瓜期优化水氮处理降低黄瓜根冠比,提高地上部干物质积累量和分配比例,特别是促进果实积累.黄瓜对氮磷钾养分吸收量的大小为:钾>氮>磷,形成150 ~ 200 t/hm2商品产量的黄瓜,氮磷钾吸收量分别为N 396~490 kg/hm2,P 93~ 127 kg/hm2,K 516 ~529 kg/hm2,优化水氮供应处理的黄瓜氮磷钾吸收比例(N:P:K)为1:0.20:1.17.增施氮肥和节水灌溉均能增加黄瓜干物质积累量、提高氮素吸收量.与传统水氮管理相比,优化水氮供应提高植株氮素吸收量和果实氮素吸收的比例,提高了对磷钾的吸收比例,但降低了磷钾吸收量.优化水氮供应在保证黄瓜产量的前提下,显著提高了氮肥利用效率、氮肥偏生产力和水分利用效率,同时降低了黄瓜对磷钾的奢侈吸收.
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