密肥互作对全膜双垄沟播玉米产量及水分利用效率的影响

为进一步完善全膜双垄沟播玉米栽培技术体系，采用大田随机区组试验法，研究了不同密度和施肥水平对全膜双垄沟播玉米产量和水分利用效率的影响。结果表明：6.75×10⁴株·hm^-2种植密度下玉米产量和水分利用效率显著高于4.50×10⁴株·hm^-2密度处理。不同施肥处理条件下，玉米穗 行数和产量均以施纯氮180 kg·hm^-2，施过磷酸钙144 kg·hm^-2处理最高；玉米百粒重和 水分利用效率均以施纯氮210 kg·hm^-2，施过磷酸钙168 kg·hm^-2最高；6.75×10⁴株·hm^-2密度下施纯氮210 kg·hm^-2，施过磷酸钙168 kg·hm^-2处理互作效应显著，玉米百粒重、产量和水分利用效率均高于其他处理。说明6.75×10⁴株·hm^-2密度下施纯氮210 kg·hm^-2，施过磷酸钙168 kg·hm^-2是当地全膜双垄沟播玉米生产中比较理想的种植密度和施肥水平。

Effect of density and fertilizer interaction on yield and water use efficiency of maize cultivated by system of full plastic-film mulching on double ridges and planting in catchment furrows

Effect of fertilizer and density interaction on yield and water use efficiency of maize with full plastic-film mulching on double ridges and planting in catchment furrows were studied to further improve this maize cultivation system, using a randomized complete block design with three rep lications. The results indicated that the grain yield and water use efficiency in the 6.75×10⁴ plant·hm^-2 treatment were significantly higher than that of 4.50×10⁴ plant·hm^-2. Kernel rows per ear and yield in N 180 kg·hm^-2 and P₂O₅ 144 kg·hm^-2 were higher than that of others. 100-grain weigth and water use efficiency in N 210 kg·hm^-2 and P₂O₅ 168 kg·hm^-2. 100-grain weight were higher than that of others. Yield and water use efficiency in the interaction system of 6.75×10⁴ plant·hm^-2 density, N 210 kg·hm^-2, and P₂O₅ 168 kg·hm^-2 were higher than those of other treatments, as are recommended for the ridge-furrow mulching system.