The relationship between cotton canopy temperature and yield, fibre quality and water-use efficiency
The relationship between cotton canopy temperature and yield, fibre quality and water-use efficiency
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DOI：
10.1016/j.fcr.2015.08.010
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发表时间：
2015-11-01
影响因子：
5.8
通讯作者：
Sutton, Bruce G.
中科院分区：
文献类型：
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作者：
Conaty, Warren C.;Mahan, James R.;Sutton, Bruce G.
作物冠层温度（T-c）与蒸腾作用有关，T-c已被用于作物水分胁迫的检测。研究了地面滴灌和沟灌对棉花蒸腾速率的影响。本文概述了在高投入、高产量（>1800 kg ha（-1））的棉花系统中，T-c与皮棉产量、纤维品质以及农艺（WUEa，kg ha（-1）mm（-1）总施水量）和叶水平水分利用效率（WUEl，μ mol[CO2] mmol[H2O]（-1））的关系。监测开花和作物成熟之间的冠层温度。当T-c超过28 ℃时，产率降低。当T-c超过31 ℃时，纤维长度在理想范围（>28.6 mm）之外减少，而在T-c在25 ℃和32 ℃之间时观察到理想的马克隆值（3.8-4.5）。如果灌溉计划协议保持平均冠层温度低于28摄氏度，就可以实现理想的纤维质量和皮棉产量峰值。然而，最大WUEa出现在比皮棉产量峰值（28 ℃）更高的平均T-c（30 ℃），这相当于皮棉产量从峰值（3030 kg ha（-1））预计减少23%。因此，峰值产量和WUEa之间的权衡需要考虑结合灌溉水成本和可用性时，调度灌溉冠层温度的基础上。皇冠版权所有（C）2015由Elsevier B. V.出版。保留所有权利。
Crop canopy temperature (T-c) is associated with transpiration and T-c has been used in crop water stress detection. This study investigates the effect of surface drip and furrow irrigation regimes on cotton T-c. It outlines the relationship between T-c and lint yield, fibre quality and both agronomic (WUEa, kg ha(-1) mm(-1) total applied water) and leaf level water-use efficiency (WUEl, mu mol[CO2] mmol[H2O](-1)) in a high input, high yielding (>1800 kg ha(-1)) cotton system. Canopy temperature between flowering and crop maturity was monitored. Yield reductions occurred when T-c, exceeded 28 degrees C. Reductions in fibre length outside the ideal range (>28.6 mm) occurred when T-c exceeded 31 degrees C, while desirable micronaire (3.8-4.5) was observed at T-c between 25 and 32 degrees C. Desirable fibre quality and peak lint yield can be realised if an irrigation scheduling protocol maintains average canopy temperatures below 28 degrees C. However, maximum WUEa was observed at a higher average T-c, (30 degrees C) than peak lint yield (28 degrees C), which would correspond to a predicted 23% reduction in lint yield from the peak (3030 kg ha(-1)). Therefore, the trade-off between peak yield and WUEa needs to be considered in conjunction with irrigation water costs and availability when scheduling irrigations based on canopy temperature. Crown Copyright (C) 2015 Published by Elsevier B.V. All rights reserved.