不同施氮量对设施辣椒生长及产量的影响研究

摘要

A field experiment was conducted to study the effect of different N fertilizer application rate on pepper growth,yield and economic benefit in second generation greenhouse in Ningxia. The results showed that the soil has abundance available phosphorus and potassium,but relatively lack of nitrogen. The soil is gently salinized due to over fertilization in the greenhouse. N is decisive factor for pepper growth because its height,chlorophyll,diameter of stem,and yield of pepper were significantly affected by increased N appli⁃cation rate. 83% of pepper yield was relied on N fertilizer application amount. The relationship between N application rate and pepper yield can be described by parabola curve. The maximum application rate of N is 872kg·hm-2,the optimum application rate of N is 791kg·hm-2.%通过田间试验研究了宁夏日光节能温室不同施氮量对辣椒生长、产量及经济效益的影响。结果表明：供试土壤速效磷、钾含量丰富，速效氮则相对贫乏，设施内高投肥已导致土壤轻度盐渍化；氮素是决定辣椒生长发育的决定性指标，影响辣椒的叶绿素含量、茎粗、株高及产量；氮素的施用量决定83%的辣椒产量；不同氮肥施用量对辣椒的产量表现为典型的抛物线关系；施氮量为872kg·hm-2时，设施辣椒能获得最高产量，氮肥施用量为791kg·hm-2时，经济效益最高。