旱地不同种植密度对中晚熟矮秆高粱品种农艺性状及产量的影响

适宜的种植密度有助于发挥高粱品种的增产潜力。为了确定中晚熟矮秆高粱新品种在旱地的合理种植密度,在山西省晋中市太谷县采用随机区组设计方法,研究种植密度（7.5～15万株/hm2）对农艺性状及产量的影响。结果表明：随着种植密度的增加,茎粗呈减小趋势,而株高、单株叶面积和可见叶片数无显著变化;种植密度对产量性状的影响主要表现在千粒重和单穗重,两者与产量均呈显著负相关,且两者对产量影响有较高的协调性。在中晚熟旱地高粱种植区,通过增加种植密度可显著提高籽粒产量,种植密度为15万株/hm2时其籽粒产量最大。该项研究为旱地春播中晚熟矮秆高粱增加种植密度提供了理论与技术支撑。

Effects of Planting Density on Agronomic Characters and Yield of Middle-late Maturing Short-Stalked Sorghum in Dry Areas

The suitable combination of planting density is favorable for the yield increase of sorghum cultivar. In order to determine rational planting density of sorghum and to fully develop yield-increasing effect, a field trial with a sorghum variety ‘Jingzhong 911’ was conducted in Taigu, Shanxi Province, China to investigate the effects of different planting densities (ranging from 75000 to 150000 plants/hm2) on main agronomic characters and yield in a randomized block design. The results showed that with the increase of planting density, stem diameter tended to decrease, while the plant height, leaf area and leaf number seen no significant change in trend; The effects of planting density on yield traits were mainly 1000-kernel weight and weight/panicle, and yield both showed a significant negative correlation, and both have a higher impact coordination on production. In the late-maturing sorghum growing areas of dry land, by increasing planting density can significantly increase grain yield. It is concluded that when planting density 15.00 × 104 plants/hm2, the highest sorghum grain yield. The study of middle-late maturing short-stalked sorghum in dry areas to increase plant density provides a theoretical and technical support.