密度对北疆复播大豆生长动态及产量的影响研究

Effects of Planting Density on Yield and Growth Tendency of Summer Soybean in North Xinjiang

在滴灌条件下,通过设置37.5万株/hm2（A处理）、45.0万株/hm2（B处理）、52.5万株/hm2（C处理）、60.0万株/hm2（D处理）、67.5万株/hm2（E处理）5种不同种植密度,研究不同密度条件下北疆复播大豆株高、茎粗、叶面积指数（LAD、干物质积累的动态变化、产量及产量构成因素.结果表明,随着密度的增加,株高增高、茎粗变细,二者呈显著的负相关关系,相关系数达-0.8928;叶面积指数随着密度的增加而增大,单株干物质重则随着密度的增加而降低;产量随着密度的增加呈现开口向下的抛物线,以52.5万株/hm2的C处理产量最高,为3 205.04 kg/hm2,分别较A处理、B处理、D处理、E处理的分别高出14.26％,4.09％,1.42％,5.88％,均达到了极显著差异水平（P＜0.01）.北疆复播大豆的密度控制在52.5万～60.0万株/hm2可获得高产.

The field trail was conducted to study the plant height, stem diameter,leaf area index （LAI）, dry matter accumulation dynamic changes, yield and yield component factors by using five planting density of 37.5 × 10^4 （A） ,45.0 × 10^4 （B）, 52.5 × 10^4 （C）, 60.0 × 10^4 （D） and 67.5 × 10^4 （E） plants/hm2 under drip irrigation.The results showed that with increasing density, height increase, stem diameter thinning, both of which showed a significant negative correlation, correlation coefficient was -0.8928;with the increase of density ,the LAI increased ,but the dry matter accumulation of per plant decreased. Yield was presented with the increasing density of the parabola opening down, under the experimental conditions 52.5 ×10^4 plants/hm^2 of treatment C had the highest yield of 3 205.04 kg/hm2 , which is 14.26 % ,4.09%, 1.42% ,5.88% higher than treatment A, B, D and treatment E, reached a very significant difference in level （P 〈 0.01）. The summer soybean suitable density should be controlled between 52.5 × 10^4- 60.0×10^4 plants/hm2 for high yield in North Xinjiang.