菜地土壤基础供氮量对小白菜产量及氮素利用率的相关关系研究  

Correlation between Basic Amounts of Soil Nitrogen Supply Rates on Pakchoi(Brassica chinensis) Yield and Nitrogen Use Efficiency

作　　者：严瑾[1,2] 黄丹枫[1] 张屹东[1] 朱恩[2] 

机构地区：[1]上海交通大学农业与生物学院,上海200240 [2]上海市农业技术推广服务中心,上海201103

出　　处：《安徽农业科学》2014年第16期5071-5073,共3页Journal of Anhui Agricultural Sciences

基　　金：设施粮田菜地高产高效关键技术集成示范(蔬菜水肥一体化技术集成示范;沪农科推字(2013)第1-3号))

摘　　要：[目的]研究露地菜田的基础供氮能力对小白菜产量、肥料利用率的影响。[方法]通过基础供氮量试验,建立土壤基础供氮量与小白菜产量(无氮区)、小白菜氮素利用率之间的相关关系方程。[结果]5个试验点的菜地土壤基础供氮量与小白菜产量的效应函数为:y=46 616ln(x)-26 378。5个试验点每生产100 kg小白菜平均需要吸收氮素3.11 kg。[结论]每公顷施用纯氮(N)166 kg,基本可以达到小白菜优质、高产对氮素的需求,肥料利用率在24%以上。[Objective] The research aimed to study various factors of nitrogen supply on yield and fertilizer use efficiency of pakchoi.[Method] Through the basic nitrogen supply test,the correlation equation between the basic amounts of soil nitrogen supply,the yield of pakchoi （without nitrogen） and nitrogen utilization rate was established.[Result] The basic amounts of soil nitrogen and pakchoi yield was y =46 616ln （x）-26 378.In Shanghai vegetable farm,every 100 kg pakchoi demanded 3.11 kg nitrogen.[Conclusion] 166 kg nitrogen fertilizer in each hectare could meet the demand of pakchoi （Brassica chinensis） with high yield.And the nitrogen use effiency was above 24％.

关 键 词：土壤 供氮量 小白菜 利用率 

分 类 号：S143.1[农业科学—肥料学]