CROP WATER STRESS INDEX FOR PREDICTING YIELD LOSS IN COMMON BEAN

Q4 Environmental Science

IRRIGA Pub Date : 2022-01-07 DOI:10.15809/irriga.2021v1n4p687-695

C. Quiloango-Chimarro, R. D. Coelho, J. Costa, Rafael Gomez-Arrieta

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引用次数: 2

Abstract

The crop water stress index (CWSI), an index derived from canopy temperature, has been widely studied as a physiological indicator of plant water status to optimize irrigation in common beans. However, it is not clear how this index could contribute to yield prediction as a decision support tool in irrigation management. This paper aimed to use the CWSI for predicting yield loss in common bean (Phaseolus vulgaris L.) subjected to water stress under drip irrigation. A rain shelter experiment was conducted using a completely randomized design with five replications. The indeterminate growth cultivar TAA Dama was subjected to three irrigation treatments: 100% of the field capacity (FC), 75 and 50% FC from 20 days after sowing (DAS) until the end of the crop cycle. Grain yield was reduced by 42% under 50% FC treatment. Furthermore, stomatal conductance was reduced under this treatment, whereas the CWSI and canopy temperature increased as irrigation levels decreased. The relationship between grain yield and CWSI (R2=0.76, RSME=2.35g) suggests that canopy temperature data could be used to forecast grain yield losses. In conclusion, farmers can have a low-cost, effective technique for making water management decisions in common bean.

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预测普通大豆产量损失的作物水分胁迫指数

作物水分胁迫指数（CWSI）是一个由冠层温度得出的指标，作为植物水分状况的生理指标，用于优化普通豆类的灌溉，已被广泛研究。然而，目前尚不清楚该指数作为灌溉管理的决策支持工具如何有助于产量预测。本文旨在利用CWSI预测滴灌条件下普通菜豆（Phaseolus vulgaris L.）在水分胁迫下的产量损失。采用五个重复的完全随机设计进行了一项遮雨实验。对生长不确定的品种TAA Dama进行了三种灌溉处理：从播种后20天（DAS）到作物周期结束，分别为100%田间容量（FC）、75%和50%田间容量。50%FC处理使籽粒产量下降42%。此外，在这种处理下，气孔导度降低，而CWSI和冠层温度随着灌溉水平的降低而升高。粮食产量与CWSI之间的关系（R2=0.76，RSME=2.35g）表明，冠层温度数据可用于预测粮食产量损失。总之，农民可以有一种低成本、有效的技术来制定普通大豆的水分管理决策。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IRRIGA Environmental Science-Water Science and Technology

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： A Revista IRRIGA é destinada a publicar trabalhos originais e que contribuam para o desenvolvimento cientifico da agricultura em português, espanhol, preferivelmente em inglês, nas áreas de Irrigação, Drenagem, Hidrologia, Agrometeorologia, Relações Solo-Água-Planta-Atmosfera e Reuso de Água. IRRIGA is a Scientific Journal edited by Agricultural Science College-UNESP, devoted to the publication of original scientific papers in English or Portuguese or Spanish, within the topics: Irrigation, Drainage, Agrometeorology, Hydrology, Waste Water and Soil-Water-Plant-Atmosphere Relationships.