按照简化栽培技术和农业生态建设的理论 ,对陕西棉区不同品种、不同密度、不同基肥 N、P的施用量进行田间综合试验研究。结果表明 ,密度每公顷种植 7.5万株 ,比 4.5万株、6万株分别增产6 71 .85 kg、 483 .3 0 kg,增产 5 7.49%和 41 .3 6 %。品种陕 40 2 (早 )、陕 5 76 (中早熟 ) ,分别比中棉所 1 9(中熟 )增产 1 6 .6 2 %和 1 6 .1 7%。基肥施二铵比施尿素增产 1 2 6 kg,每公顷施 1 5 0～ 2 2 5 kg,分别增产1 1 .3 5 %和 1 0 .5 3 %。 According to the theory of simplified cultivation techniques and agricultural ecological construction, field experiments were conducted to evaluate the application rates of N, P in different varieties, different densities, and different basal fertilizers in Shaanxi cotton area. The results showed that the density increased 75,100 plants per hectare, 45,100 plants and 60,000 plants increased by 6 71.85 kg, 483.30 kg, increased yield by 5 7.49% and 41.36% respectively. Varieties Shan 40 2 (early) and Shaan 5 76 (early-maturing) increased yields by 16.62% and 16.17% respectively over that of Zhongmian 1 9 (medium maturing). Basal fertilizer diammonium than urea yield 126kg, hectare 1500 ~ 225kg, respectively, an increase 11.35% and 10.33%.