Growth and fiber quality of colored cotton under salinity management strategies

ABSTRACT Using saline water in the agricultural activity has become a reality in several regions of the world. Due to the increase in the demand for fresh water, it is necessary to use cultivation strategies and genotypes tolerant to saline stress to make the production viable. In this context, effects of irrigation management strategies with low-salinity water (0.8 dS m-1) and high-salinity water (9.0 dS m-1) were evaluated, varying the phenological stages of the plants, on the growth and fiber quality of colored cotton. Three cotton cultivars submitted to seven irrigation management strategies were used, constituting a 3 x 7 factorial scheme, in a randomized block design with three replicates, in plots and in protected environment. Saline water irrigation in the vegetative and flowering stages can be used in cotton cultivation with the lowest losses of growth, phytomass accumulation and fiber quality. Saline water application during boll development is detrimental to the growth and quality of cotton fiber. The genotype BRS Topázio is tolerant to water salinity, with better fiber length, regardless of the development stage.

摘要 农业生产中使用咸水已成为全球多个地区的既定现实。受全球淡水需求持续增长的影响，亟需采用栽培策略与耐盐胁迫基因型，以保障农业生产可持续开展。在此背景下，本研究针对低盐（0.8 dS·m⁻¹）与高盐（9.0 dS·m⁻¹）灌溉管理策略在不同生育阶段对彩棉生长及纤维品质的影响展开了评估。试验选用3个棉花品种，设置7种灌溉管理策略，构成3×7因子试验方案，于小区及保护地环境中开展，采用随机区组试验设计并设置3次重复。结果表明，在棉花营养生长与开花阶段采用咸水灌溉，可将生长、植株生物量积累及纤维品质方面的损失降至最低；而在棉铃发育阶段施加咸水灌溉，则会对棉花生长与纤维品质产生不利影响。基因型BRS Topázio具有耐盐性，且无论处于哪个生育阶段，其纤维长度均表现更优。