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Defining physiological contributions to yield loss in response to irrigation in cotton
Journal of Agronomy and Crop Science ( IF 3.5 ) Pub Date : 2020-10-27 , DOI: 10.1111/jac.12453
Alessandro Ermanis 1 , Stefano Gobbo 2 , John L. Snider 1 , Yafit Cohen 3 , Vasileios Liakos 1 , Lorena Lacerda 1 , Calvin D. Perry 4 , Matthew Aaron Bruce 1 , Gurpreet Virk 1 , George Vellidis 1
Affiliation  

Excessive irrigation can reduce cotton yield, but studies assessing the relative contribution of component physiological processes to yield loss are limited. The objective of the current experiment was to quantify irrigation‐induced yield loss attributable to Intercepted Photosynthetically Active Radiation (IPAR), Radiation Use Efficiency (RUE) and Harvest Index (HI). For three irrigation treatments (well‐watered, over‐irrigated, and dryland) during the 2018 and 2019 growing seasons, biweekly measurements of predawn leaf water potential (ΨPD) and light interception were taken along with measurements of biomass, lint yield, fibre quality and harvest index. Irrigation effects on yield were only observed during the 2019 season, and the results showed that ΨPD remained relatively high in both seasons and was rarely affected by irrigation treatment. A significant reduction in yield was observed for irrigated treatments, despite the dryland producing lower biomass. Any positive effects of IPAR and RUE on lint yield due to excess irrigation were offset by large declines in HI. We conclude that HI was the dominant contributor to yield loss due to excessive irrigation because reduced boll numbers and average boll mass were observed in plots with the greatest total above‐ground biomass.

中文翻译:

定义棉花灌溉对产量损失的生理贡献

过度灌溉会降低棉花产量,但评估组成生理过程对产量损失的相对贡献的研究有限。当前实验的目的是量化归因于光合有效辐射(IPAR),辐射利用效率(RUE)和收获指数(HI)的灌溉导致的产量损失。为了在2018年和2019生长季3个灌溉处理(水分充足,过度灌溉,和旱地),黎明前叶水势(Ψ的每两周测量PD)和光拦截用生物质的测量,皮棉产量,纤维沿着取质量和收获指数。在2019赛季只观察到对产量的影响灌溉,结果表明,Ψ PD在两个季节中都保持较高水平,并且很少受到灌溉处理的影响。尽管干旱地区的生物量较低,但灌溉处理的产量却明显下降。由于过量灌溉,IPAR和RUE对皮棉产量的任何积极影响都被HI的大幅下降所抵消。我们得出的结论是,HI是过度灌溉造成产量损失的主要因素,因为在地上总生物量最大的地块中观察到铃数减少和平均铃质量下降。
更新日期:2020-10-27
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