摘要
通过田间试验研究了不同施肥对日光温室黄瓜NO-2 N和NO-3 N含量和土壤NO-3 N以及黄瓜产量的影响。结果表明,在黄土高原黄绵土上,施N400kg hm2和P2O5250kg hm2,黄瓜生长期间,NO-3 N含量变化与黄瓜的生长发育阶段关系密切,黄瓜结瓜前0—20和20—40cm土层NO-3 N含量较高,随黄瓜生长速度加快和结瓜盛期的到来,土壤NO-3 N含量降低;黄瓜收获后,NO-3 N含量又有增加。不同施肥种类比较,施用化肥40—160cm土层NO-3 N的累积和淋洗量最大,施用沼肥其累积和淋洗量小于施用化肥,而施用有机肥(牛粪)NO-3 N的累积和淋洗量小于施用沼肥。采用叶面喷施尿素和有机钾肥,可以减少化肥和有机肥用量,从而降低土壤剖面0—200cmNO-3 N的累积。使用沼肥、叶面肥的黄瓜产量都明显高于不施肥和NP化肥处理。
A field experiment was conducted in sunlight greenhouse to study the effect of fertilization on NO^-_2-N and NO^-_3-N contents of cucumber, NO^-_3-N content in soil, and cucumber yield. The result shown that, application of N 400kg/hm^2 and P_2O_5 250 kg/hm^2, the NO^-_3-N content in 0-20 and 20-40 cm soil layers related with the growth and developing stage of cucumber during the cucumber growth period under condition of Huangmian soil on Loess Plateau. The NO^-_3-N content was relatively higher before fruiting stage, however, the NO^-_3-N content became lower with the cucumber growing developing and increased after harvest in 0-20 and 20-40cm soil layers. After harvest the cucumber, the NO^-_3-N accumulation and leaching in 40-160cm soil profile was highest by using chemical fertilizer, lower by using methane and lowest by using manure. Foliage dressing by urea and organic K during cucumber growth period could reduce the rates of fertilizer and manure and decreased the NO^-_3-N content in 0-200cm soil layer. The cucumber yield was higher by using methane and foliage spray of urea and organic K than that application of NP fertilizers and without fertilizers.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2004年第1期68-72,共5页
Journal of Plant Nutrition and Fertilizers
基金
中国科学院知识创新项目(KZCX1-06-02)资助。
