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以适合机械化种植的2个高粱品种(辽杂37、晋杂34)为试材,研究其种植密度分别为9.0万、10.5万、12.0万、13.5万、15.0万、16.5万株/hm~2时对产量、产量构成因素、叶面积指数、叶绿素含量、光合速率、群体透光率及生育期的影响。结果表明,辽杂37、晋杂34在种植密度为13.5万株/hm~2时,穗数、穗粒数、千粒质量相互共同作用效果相对最佳,最有利于获得较高的产量;产量构成因素中,单位面积穗数的变化最为活跃,穗粒质量次之,而千粒质量受种植密度影响较小;辽杂37、晋杂34种植密度为13.5万株/hm~2时,2个品种的叶面积指数分别为3.59、3.49,光合速率较对照变化相对较小;辽杂37、晋杂34这2个品种的密植潜力存在差异,辽杂37群体的光合速率、叶绿素含量等比晋杂34更具优势,更具密植潜力。
Two sorghum cultivars suitable for mechanized planting (Liaoza 37 and Jinza 34) were used as materials to study the effects of planting density of 90,000, 105,000, 120,000, 135,000, 150,000 and 165,000 plants / hm 2 On yield, yield components, leaf area index, chlorophyll content, photosynthetic rate, population light transmittance and growth period. The results showed that the interaction effect of spikelets, grains per spike and 1000 - grain weight were the best when Liaoza 37 and Jinza 34 were planting density of 135 000 plants / hm ~ 2, which was the best for obtaining higher yield. Among the components of yield, the spike number per unit area was the most active, followed by the spike grain quality, while the quality of 1000 grain was less affected by the planting density. When Liaoza 37 and Jinza 34 planting density was 135 000 plants / hm 2, The leaf area index of the two cultivars were 3.59 and 3.49, respectively, and their photosynthetic rate was relatively smaller than that of the control. There were differences in the planting density between the two varieties Liaoza 37 and Jinza 34, and the photosynthetic rate and chlorophyll content of Liaoza 37 34 more than Jin Jin advantage, more close planting potential.