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滴灌棉花ABA不同氮肥处理下与土层20cm田间持水率之间的响应特征

, PP. 968-975

Keywords: 滴灌,盆栽,棉花,ABA,田间持水

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Abstract:

利用滴灌盆栽试验,研究蕾期和花铃期不同施N水平的条件下,滴灌棉花ABA浓度与土层20cm田间持水率之间的响应特征,结果表明:在蕾期不同处理纯N分别为N2、N4、N6g/盆的条件下,滴灌棉花ABA含量与土层20cm田间持水率之间的相关性系数(r)的分别为-0.946、-0.917、-0.966,T检验显著水平P为0.015、0.029、0.007;模型拟合决定系数(R2)分别为0.977、0.852、0.934;花铃期,滴灌棉花ABA含量与土层20cm田间持水率之间的相关性系数(r)的分别为-0.788、-0.959、-0.861;模型拟合决定系数(R2)分别为0.737、0.937、0.872;因而,蕾期盆栽滴灌棉花在纯N分别为N2、N4、N6g/盆的条件下,滴灌棉花ABA含量与土层20cm田间持水率之间的相关性为负相关,N6g/盆的相关性达到显著水平,N6g/盆处理拟合决定系数(R2)达到极显著水平,其模型为对数。花铃期滴灌棉花ABA含量与土层20cm田间持水率之间的相关性为负相关,N4g/盆的相关性达到极显著水平,模型拟合决定系数(R2)N4g/盆达到极显著水平其模型为指数函数。本文研究的回归模型很好地描述了滴灌棉花腾发量及需水特性,为内陆干旱区绿洲农业滴灌棉花耗水量的估算提供了新计算方法和科学依据。

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