通过研究河西地区水肥一体化条件下不同种植密度对不同饲用玉米品种产量和品质的影响，为河西地区饲用玉米高产栽培及品种筛选提供科学依据和技术支撑。选用饲用玉米品种垦玉1608、正德305和豫单1851进行了不同种植密度(7.5万、9.0万、10.5万、12.0万株/hm2)比较试验，在玉米籽粒乳线达到1/2时测定全株玉米相关农艺性状、产量和品质并进行分析。结果表明，饲用玉米品种与种植密度的交互作用对其农艺性状和产量无显著影响(P ＞ 0.05)，品种对株高、穗位高、叶面积、穗粗、穗行数、秃尖长具有显著影响(P ＜ 0.05)，种植密度对穗位高、茎粗、叶面积、穗长、穗粗、穗行数、穗粒数、秃尖长、单株产量、单穗重、产量具有显著影响(P ＜ 0.05)，种植密度与饲用玉米粗蛋白含量呈负相关，与中性洗涤纤维、酸性洗涤纤维含量呈正相关。正德305耐密性好，适宜种植密度为10.5万株/hm2，垦玉1608、豫单1851的适宜种植密度为9.0万株/hm2。

In order to study the effects of different planting densities on the yield and quality of silage maize under the condition of water and fertilizer integration in Hexi area so as to provide scientific basis and technical support for the high-yield cultivation and variety screening of silage corn in the Hexi area, three silage maize varieties(Kenyu 1608, Zhengde 305 and Yudan 1851) were selected as the experiment materials, and four planting densities(7.5×104 plants/ha, 9.0×104 plants/ha, 10.5×104 plants/haand 12.0 plants/ha) were set, respectively. Agronomic traits, yield and quality of whole corn were measured when the milk line reached 1/2. Results showed that the interaction between maize variety and density had no significant effects on agronomic traits and yield (P > 0.05), but maize variety had significant effects on plant height, ear height, leaf area, ear diameter, ear row number and bald tip length(P < 0.05). Density had significant effects on ear height, stem diameter, leaf area, ear length, ear diameter, row number of ears, kernel numberper ear, bald tip length, plant weight, ear weight and yield of silage maize(P < 0.05). Density had a negative correlation with crude protein content of silage maize, and a positive correlation with neutral detergent fiber and acid detergent fiber contents. Zhengde 305 has good density tolerance compared with the other two varieties, and the suitable planting density are 10.5×104 plants/ha, while the suitable planting density of Kenyu 1608 and Yudan 1851 are 9.0×104 plants/ha.

S513