等行距密植下滴水量对不同抗旱性棉花品种群体生长特性的影响

目的]研究等行距密植下精量制定棉花的田间水分管理制度分析机采棉花高效生产机理.方法]选用抗旱性强的棉花品种新陆早22号(P22)和抗旱性弱的新陆早17号(P17)为参试品种,在等行距密植机采模式下,设3000(W1)、3900(W2)、4800(W3)m3/hm23个处理水平,测定并分析不同处理下群体生长率(CGR...

Effects of Dripping Amount under Equal-Row Dense Planting on the Population Growth Characteristics of Different Drought-Resistant Cotton Varieties

【Objective】 To precisely formulate cotton field moisture management system under equal row spacing and close planting and reveal the efficient production mechanism of machine-picked cotton.【Method】 The cotton varieties Xinluzao 22 (P₂₂) with strong drought resistance (P₂₂) and Xinluzao 17 (P₁₇) with weak drought resistance were selected as the tested varieties, and in the machine-harvesting mode of equal row spacing, 3,000 (W₁), 3,900 (W₂) and 4,800 (W₃) m³/hm² treatment levels were set to measure and analyze the crop growth rate (CGR), net assimilation rate (NAR), cotton boll growth rate (BGR) and leaf area loading boll (LAB) under different treatments.【Result】 With the increase of dripping water, cotton CGR, NAR, BGR and LAB all showed a significant upward trend.Among them, there was no significant difference between W₂ and W₃ treatments in the BGR from P₂₂ to the late blooming stage, but all were significantly lower than W₁ Treatment: The BGR of P₁₇ increased significantly with the increase of dripping water in each growth period.Among cultivars, the CGR, NAR, and LAB of P₂₂ were 12.8%-18.2%, 12.3%-12.9%, 10.3%-12.2% higher than P₁₇ from the full flowering stage to the late full boll stage, and the BGR was in the full bloom stage, full boll stage.In the later period, it was 11.9%-30.4% higher than P₁₇.Correlation analysis showed that the BGR in the late blooming period was significantly positively correlated with BGR and LAB in the blooming period, and CGR, NAR, and BGA in the blooming period were all significantly positively correlated.【Conclusion】 Under the condition of equal row spacing and close planting, the selection of drought-resistant cotton varieties under the condition of 3,900 m³/hm² is beneficial to maintain a higher population growth rate and boll growth rate in the late stage of blooming to full boll, and promote photosynthetic production to cotton bolls.