为了探究平凉地区玉米产量提升最适种植密度和有机肥施肥量，以种植密度和有机肥施肥量为参试因子，以不同种植密度(67 500、75 000、82 500、90 000、97 500株/hm2)为主区处理、不同有机肥施肥量(67 500、82 500、97 500 kg/hm2)为副区处理，设置二因素裂区试验，以探究种植密度与有机肥互作效应对玉米籽粒产量、产量构成因素和经济效益的影响。结果表明，种植密度与有机肥互作主要通过增加穗数提高玉米籽粒产量，产量随着种植密度和有机肥配施用量的增加而增加，其中种植密度97 500株/hm2、施有机肥97 500 kg/hm2的处理籽粒产量最高，为17 998.0 kg/hm2；经济效益最好，总收益和净收益最大，为4.68万元/hm2和1.24万元/hm2。

In order to determine the optimal planting density and organic fertilizer application rate for increasing maize yield in Pingliang region, a split-plot experiment was designed using planting density and organic fertilizer rate as experimental factors. Five planting densities (67 500, 75 000, 82 500, 90 000, 97 500 plants/ha) were assigned to main plots, and three organic fertilizer rates (67 500, 82 500, 97 500 kg/ha) to subplots. The interaction effects of these two factors on maize grain yield, yield components, and economic benefit were investigated. Results showed that the interaction mainly improved maize grain yield by increasing ear number. Yield increased with higher planting density and organic fertilizer input. The highest grain yield, 17 998.0 kg/ha was obtained under the combination of 97 500 plants/ha planting density and 97 500 kg/ha organic fertilizer rate. This treatment also resulted in the highest economic return, with total and net profits reaching 46 800 and 12 400 Yuan/ha, respectively.

S513；S147.2

平凉市科技计划项目(PL-STK-2022A-070)。