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旨在确定生长调节剂施用与高粱丰产种植密度的最佳耦合度。以高粱‘晋杂18号’为材料,试验采用不同密度和化控试剂的双因子随机区组设计,3次重复。化控试剂喷施浓度设置4个梯度。结果表明,密度为150000株/hm~2效果最佳。处理A1B2光合速率分别比A2B2、A3B2和CK提高15.55%、22.22%和24.44%;处理A1B2叶绿素含量分别比A2B2、A3B2和CK提高7.01%、9.72%和17.06%;处理A1B2高粱产量分别比A2B2、A3B2和CK提高7.66%、9.10%和10.19%;处理A1B2株高分别比A1B1、A1B3、A2B1、A2B2、A2B3、A3B1、A3B2、A3B3和CK降低了2.01%、2.76%、4.83%、6.45%、10.3%、6.21%、11.7%、13.78%、21.38%。低密度条件下,抗折力高于高密度种植条件。以处理A1B2效果最佳。适宜浓度的乙烯利、矮壮素具有促进高粱多种生理代谢和提高光合性能的作用,最终使籽粒产量增加。确定生长调节剂施用与高粱丰产种植密度的最佳耦合度为乙烯利稀释200倍喷施和高粱种植密度为150000株/hm~2。
The aim was to determine the optimal coupling of growth regulator application to sorghum high yield density. Taking sorghum ’Jinza 18’ as material, the experiment was designed with two-factor randomized block design of different density and chemical control reagent, and repeated three times. Chemical control spray concentration set 4 gradient. The results showed that the best density of 150000 plants / hm ~ 2. The photosynthetic rate of A1B2 was increased by 15.55%, 22.22% and 24.44% respectively than that of A2B2, A3B2 and CK. The content of chlorophyll of A1B2 was 7.01%, 9.72% and 17.06% higher than that of A2B2, A3B2 and CK, A3B2 and CK increased by 7.66%, 9.10% and 10.19%, respectively. The plant height of A1B2 was reduced by 2.01%, 2.76%, 4.83% and 6.45% respectively compared with that of A1B1, A1B3, A2B1, A2B2, A2B3, A3B1, A3B2, A3B3 and CK, 10.3%, 6.21%, 11.7%, 13.78%, 21.38%. Under low-density conditions, the bending strength is higher than the high-density planting conditions. The best way to handle A1B2. Appropriate concentrations of ethephon and chlormequat have the role of promoting a variety of physiological metabolism of sorghum and improving photosynthetic characteristics, and ultimately increase grain yield. The best coupling degree between growth regulator application and sorghum high yield planting density was 200 times spraying ethephon and the planting density of sorghum was 150000 plants / hm ~ 2.