Abstract: Intercropping of grass and beans can bring into play a synergistic effect of competition and complementarity between crops， improve system productivity and increase land use efficiency. In this study， monoculture maize（Zea mays L.） was used as the control. The sowing rows of maize （1，2，3 rows， Denote as： M₁， M₂and M₃） and the sowing density of maize （60 000 plants·hm^-2， 75 000 plants·hm^-2， 90 000 plants·hm^-2， Denote as： D₁， D₂and D₃） were interplanted with alfalfa（Medicago sativaL.）. A total of 9 alfalfa-maize intercropping modes were set. The effects of different planting rows and density of silage maize intercropping with alfalfa on the performance of silage maize were studied. The results showed as follows： （1） Different intercropping row number and density had significant effects on plant height， stem diameter， number of green leaves， number of yellow leaves， leaf area and ear weight of silage maize. In the intercropping mode， the equivalent ratio of each treatment land was greater than 1. （2） The hay yield of M₃D₃ population was the highest， reaching 30.76 t·hm^-2. （3） Row number and density of silage maize had significant effects on crude protein （Crude protein，CP）and relative feeding value（Relative feeding value，RFV）. CP and RFV contents of M₃D₃ were increased by 5.92% and 4.57%， respectively， compared to CK group. According to the comprehensive ranking by the principal component method， the sequence of intercropping silage maize patterns was as follows： M₃D₃>M₃D₁>M₃D₂>M₂D₂>M₂D₃>M₂D₁>M₁D₃>M₁D₂>M₁D₁. In conclusion， when three rows of intercropping maize were planted in Hexi irrigation area and the density was 90 000 plants·hm^-2， the production performance of silage maize was the best.

Key words: Intercropping, Silage corn, Alfalfa, Planting density, Planting rows, Production performance

摘要： 禾豆间套作可发挥作物间的竞争与互补协同作用，提高系统生产力，增加土地利用效率。本研究以玉米（Zea mays L.）单作为对照，设置玉米播种行数（1，2，3行，记为：M₁，M₂和M₃）、玉米播种密度（60 000株·hm^-2，75 000株·hm^-2，90 000株·hm^-2，记为：D₁，D₂和D₃）与紫花苜蓿（Medicago sativa L.）进行间作，共9种苜蓿-玉米间作模式，研究青贮玉米不同种植行数和密度与紫花苜蓿间作，对青贮玉米生产性能的影响。结果表明：（1）间作不同种植行数和密度对青贮玉米的株高、茎粗、绿叶数、黄叶数、叶面积和果穗重有显著影响。各处理土地当量比均大于1。（2）M₃D₃的群体干草产量最大，达到了30.76 t·hm^-2；（3）青贮玉米种植行数和密度对粗蛋白（Crude protein，CP）和相对饲用价值（Relative feeding value，RFV）有显著影响，M₃D₃的CP和RFV含量较单播玉米分别提高了5.92%和4.57%。主成分分析表明，紫花苜蓿间套作青贮玉米模式的顺序为：M₃D₃>M₃D₁>M₃D₂>M₂D₂>M₂D₃>M₂D₁>M₁D₃>M₁D₂>M₁D₁。即在河西灌区间套作玉米种植三行，密度为90 000株·hm^-2时，青贮玉米生产性能最佳。

关键词: 间作, 青贮玉米, 紫花苜蓿, 种植密度, 种植行数, 生产性能