耕作方式和水分处理对棉花生产及水分利用的影响

    Effect of tillage methods and water treatment on production and water use of cotton

    • 摘要: 为了确定麦后移栽棉适宜耕作方式和灌溉控制指标,该文设计了翻耕、免耕和少耕3种耕作方式处理,同时针对少耕耕作方式在蕾期和花铃期均设计了2种水分亏缺处理(土壤水分控制下限分别为田间持水率的60%和50%),分析了不同耕作方式及少耕不同土壤水分处理对麦后移栽棉耗水规律、籽棉产量、水分利用效率及纤维品质的影响。研究结果表明,翻耕和少耕处理对麦后移栽棉的总耗水量、籽棉产量、水分利用效率均无显著性影响;免耕处理虽可节水19.96%,但产量降低了13.15%。不论蕾期还是花铃期,少耕水分亏缺均不利于棉铃生长,显著降低了成铃数,且籽棉产量随水分亏缺程度的增大而显著降低,其中蕾期同等程度水分亏缺的减产率大于花铃期;不同耕作方式对棉花的纤维品质无显著影响,而水分亏缺有降低品质的趋势。因此,少耕耕作方式在不减产的情况下,起到了保土保水的效果,且蕾期和花铃期土壤水分均控制在田间持水率的70%以上,可作为该耕作方式的灌溉控制指标。

       

      Abstract: To develop a suitable tillage method and irrigation schedule of transplanted cotton following wheat harvest under sprinkler irrigation, three treatments such as plowing tillage, no-tillage and minimum tillage were designed in this paper, and two water deficit treatments with 60% and 50% of field capacity were set at both bud stage and flower and boll stage under minimum tillage method, respectively. The effects of different tillage methods and soil water regime on total water consumption, seed yield, water use efficiency and fiber quality on transplanted cotton following wheat harvest were analyzed. The results showed that plowing tillage and minimum tillage did not have significant influence on water consumption, seed yield, water use efficiency and fiber quality of cotton. Although no-tillage had significant influence on water consumption and seed yield, it could save water by 19.96% and reduced yield by 13.15%. The minimum tillage with water deficit at bud stage and at flower and boll stage restrained the boll growth, significantly reduced the boll number, and reduced seed yield with increasing water deficit degree,especially if water deficit was at the same degree,rate of reduction of output at bud stage would be higher than that at flower and boll stage. Different tillage methods did not affect the fiber quality of cotton significantly, but water deficit reduced fiber quality. Therefore, minimum tillage methods can play a role in water and soil conservation without reducing yield, and its irrigation control index is to keep soil moisture above 70% of field capacity at the bud stage and at flower and boll stage.

       

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