不同种植密度对高粱成穗数、产量及其构成因素的影响

Effects of Planting Density on Effective Ears, Yield and Yield Component Factors of Sorghum

为了探讨不同种植密度对高粱成穗数、产量及其构成因素的影响,确定酿造高粱品种在旱地的合理种植密度,以酿造高粱‘晋杂23号’为试验材料,在山西省农科院经济作物研究所试验田研究了不同种植密度（6.00万株/hm2、8.25万株/hm2、10.50万株/hm2、12.75万株/hm2、15.00万株/hm2）对高粱生长、产量及其构成因素、成穗数的影响。结果表明：随着种植密度的增加,高粱株高、茎粗、穗长、最大叶面积、穗粒重、千粒重呈下降趋势,但差异不显著。在6.00万株/hm2~10.50万株/hm2的密度范围内,籽粒产量随密度增加呈大幅度增加;当密度超过10.50万株/hm2时,籽粒产量趋于平稳。回归分析表明,高粱种植密度与成穗数间呈极显著的正相关,回归方程为y=26866.222＋0.555x。综合分析,酿造高粱‘晋杂23号’的种植密度以10.50万株/hm2为宜。该研究为酿造高粱在该地区种植获得高产提供了一定理论依据。

In order to explore the effects of planting density on the effective ears, yield and yield component factors of sorghum and to determine rational planting density of brewing sorghum, a field trial with a brewing sorghum variety ＇Jinza No.23＇ was conducted to investigate the effects of different planting densities （60000, 82500, 105000, 127500, 150000 plants/hm2） on growth, yield and its component factors and effective ears of sorghum in the experimental plot of The Industrial Crop Institute of Shanxi Academy of Agricultural Sciences, China. The results showed that with the increase of planting density, plant height, stem diameter, ear length, maximum leaf area, ear grain weight, 1000-grain weight of sorghum tended to decrease, but there was no significant difference. When the planting density was at the range of 60000- 105000 plants/hm2, with the increase of plant density, grain yield increased significantly; when the planting density was more than 105000 plants/hm2, grain yield tended to be steady. The regression analysis showed that the planting density was significantly and positively correlated with the effective ears, and the regression equation was y=26866.222＋ 0.555x. To synthesize the above analysis, the planting density of 105000 plants/hm2 was appropriate for brewing sorghum ＇Jinza No.23＇. The study could provide a theoretical basis for brewing sorghum to achieve high yield in the region.