不同用量浓缩沼液对棉花生长发育及光合特性的影响

【目的】 分析不同浓缩沼液用量对棉花生长动态、光合特性及产量的影响。研究促进棉花高产的浓缩沼液施用技术。【方法】 采用田间试验方法。【结果】 施用浓缩沼液对棉花的生长发育和产量形成有显著的促进作用,且浓缩沼液施用量越大,促进作用越强。施用175 L/hm²浓缩沼液的株高、茎粗、单株干物质积累、叶面积指数均表现最佳,各项生长指标最高时比对照同期值分别高出8.83%、12%、24.78%、16.38%。施用了175 L/hm²浓缩沼液,棉花的各项光合特性参数表现最优,盛花期时Pn、Tr、Gs分别比对照同期值高29.35%、20.60%、17.99%,而Ci比对照低19.66%。施用浓缩沼液能够提高棉花的铃数和铃重,施用了175 L/hm²浓缩沼液的籽棉产量最高,达到7 445.68 kg/hm²,比对照高出了17.77%。【结论】 施用高浓度的浓缩沼液更有利于棉花的生长发育,促进产量的提高。

Effects of Different Amounts of Concentrated Biogas Slurry on Growth,Development and Photosynthetic Characteristics of Cotton

【Objective】 Concentrated biogas slurry is a kind of fertilizer resource produced by the processing of biogas waste and an important way for crops to realize environmentally friendly and resource-efficient production, so it is of positive significance to promote our country's agricultural ecological transformation. 【Method】 To explore the concentrated biogas slurry application technology of high yield in cotton, field experiments were conducted to study the effects of different concentrations of biogas slurry liquid on cotton growth dynamics, photosynthetic characteristics and yield.【Result】 The results showed that the application of concentrated biogas slurry had a significant effect on cotton growth, development and yield formation, and the greater the amount of concentrated biogas slurry liquid was, the stronger the promoting effect was. The plant height, stem diameter, dry matter accumulation per plant, leaf area index were the best by applying 175 L/hm² concentration of biogas slurry, which were higher 8.83%, 12%, 24.78% and 16.38 % than those of the CK treatment in the same growth period, respectively. Application of concentrated biogas slurry could improve the photosynthetic capacity of cotton, and all photosynthetic characteristic parameters of cotton were optimal by applying 175 L/hm² concentrated biogas slurry, the net photosynthetic rate (Pn), transpiration rate (Tr) and stomatal conductance (Gs) were 29.35%, 20.60% and 17.99% higher than those of CK at full-bloom stage, respectively, while intercellular CO₂ concentration (Ci) was 19.66% lower than that of the CK at the same period. Using concentrated biogas slurry could increase the number and weight of boll of cotton, thus increasing the yield of cotton. The highest grain yield of 175 L/hm² concentrated biogas slurry treatment was 7 445.68 kg/hm², 17.77% higher than that of the CK. 【Conclusion】 Within the scope of this study, the higher concentration application of concentrated biogas slurry was more beneficial to the cotton growth and increase the yield.