Water Stress Indices as Indicators of Silage Soybean [Glycine max (L.) Merr.] Productivity Under Drought Conditions

IF 3.7 2区农林科学 Q1 AGRONOMY

Journal of Agronomy and Crop Science Pub Date : 2025-01-25 DOI:10.1111/jac.70025

Mualla Keten Gokkus, Cagatay Tanriverdi, Hasan Degirmenci

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引用次数: 0

Abstract

Silage soybeans subjected to water stress show symptoms as if it had been subjected to drought stress due to lack of rainfall. Understanding how water stress impacts crop yield is crucial for developing effective irrigation strategies in drought‐inclined areas. This study investigates the relationship between silage soybean forage yield and water stress indices, specifically the Crop Water Stress Index (CWSI) and the Water Deficit Index (WDI). In addition, water‐yield relations were also determined. The study was carried out in a randomised complete block design with four irrigation levels (S100, S75, S50, S25), three replications, and a period of 2 years. At the end of the study, crop evapotranspiration (ET), irrigation (I), water use efficiency (WUE) and forage yield decreased as irrigation water levels were reduced from S100 to S25. ET was found to be between 501 and 755 mm, WUE was found to be between 2.61 and 3.58 kg m−3, irrigation water use efficiency was found to be between 2.53 and 2.97 kg m−3, forage yield was found to be between 15.4 and 26.2 t ha−1, WDI varied between 0.16 and 0.5, and CWSI ranged between 0.34 and 0.90. The results revealed that silage soybean should be irrigated when the average CWSI value is nearly 0.36 and the average WDI value is nearly 0.26 for high yield. The rate of decrease in forage yield from S100 to S25 was compared with the rate of increase in WDI and CWSI. In the first year of the study, there was a 45% decrease in forage yield between S100 and S25, while CWSI increased by 65%. However, this situation was 40% in WDI. In the second year of the study, there was a 38% decrease in forage yield from S100 to S25, while CWSI increased by 33% and WDI increased by 26%. The relationship between forage yield and stress indices is inversely proportional. The fact that the values in CWSI were proportionally higher than WDI suggested that the calculations were made without taking into account the soil temperatures during the measurement. Water stress indices were correlated with forage yield and regression analysis was performed. Although relations of forage yield and water stress indices showed slightly higher correlations with WDI, this could not strongly suggest that WDI was more accurate than CWSI. In order to obtain clearer results in the comparison studies of water stress indices, it is recommended to carry out studies with different varieties for more than 2 years.

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受到水分胁迫的青贮大豆表现出的症状就像因降雨不足而受到干旱胁迫一样。了解水分胁迫对作物产量的影响对于干旱地区制定有效的灌溉策略至关重要。本研究调查了青贮大豆饲草产量与水分胁迫指数（特别是作物水分胁迫指数（CWSI）和缺水指数（WDI））之间的关系。此外，还确定了水分与产量的关系。研究采用随机完全区组设计，有四个灌溉水平（S100、S75、S50、S25），三次重复，为期两年。研究结束时，作物蒸散量（ET）、灌水量（I）、水分利用效率（WUE）和牧草产量随着灌水量从 S100 到 S25 的减少而下降。蒸散发介于 501 至 755 毫米之间，水分利用效率介于 2.61 至 3.58 千克/立方米之间，灌溉水利用效率介于 2.53 至 2.97 千克/立方米之间，牧草产量介于 15.4 至 26.2 吨/公顷之间，WDI 介于 0.16 至 0.5 之间，CWSI 介于 0.34 至 0.90 之间。结果表明，要想获得高产，应在 CWSI 平均值接近 0.36 和 WDI 平均值接近 0.26 时灌溉青贮大豆。比较了从 S100 到 S25 饲料产量的下降率与 WDI 和 CWSI 的上升率。在研究的第一年，从 S100 到 S25 饲料产量减少了 45%，而 CWSI 增加了 65%。然而，这种情况在 WDI 中占 40%。在研究的第二年，从 S100 到 S25，牧草产量减少了 38%，而 CWSI 增加了 33%，WDI 增加了 26%。牧草产量和压力指数之间的关系成反比。CWSI 值在比例上高于 WDI 值这一事实表明，计算时没有考虑到测量期间的土壤温度。水分胁迫指数与牧草产量相关，并进行了回归分析。虽然牧草产量和水分胁迫指数的相关性略高于 WDI，但这并不能有力地说明 WDI 比 CWSI 更准确。为了在水分胁迫指数比较研究中获得更明确的结果，建议对不同品种进行两年以上的研究。

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来源期刊

Journal of Agronomy and Crop Science 农林科学-农艺学

CiteScore

8.20

自引率

5.70%

发文量

审稿时长

7.8 months

期刊介绍： The effects of stress on crop production of agricultural cultivated plants will grow to paramount importance in the 21st century, and the Journal of Agronomy and Crop Science aims to assist in understanding these challenges. In this context, stress refers to extreme conditions under which crops and forages grow. The journal publishes original papers and reviews on the general and special science of abiotic plant stress. Specific topics include: drought, including water-use efficiency, such as salinity, alkaline and acidic stress, extreme temperatures since heat, cold and chilling stress limit the cultivation of crops, flooding and oxidative stress, and means of restricting them. Special attention is on research which have the topic of narrowing the yield gap. The Journal will give preference to field research and studies on plant stress highlighting these subsections. Particular regard is given to application-oriented basic research and applied research. The application of the scientific principles of agricultural crop experimentation is an essential prerequisite for the publication. Studies based on field experiments must show that they have been repeated (at least three times) on the same organism or have been conducted on several different varieties.