Document Type : Original Article
Authors
1
Assistant Professor of Agricultural Meteorology, Department of Water Engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Sari, Iran
2
Ph.D. candidate of Agro-Meteorology, Department of Water Engineering, Faculty of Agricultural Engineering, Sari Agricultural sciences and Natural Resources University, Mazandaran, Iran
3
Graduate student of Science in Greenhouse Crop Production, Department of Horticulture, Faculty of Agricultural Sciences, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Iran
4
Graduate student of Science in Greenhouse Crop Production, Department of Horticulture, Faculty of Agricultural Sciences, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Iran.
10.22125/agmj.2025.532656.1185
Abstract
As a result of global warming and water availability reduction, application of new applied technologies such as shading nets have been widely studies in recent decades. This study aimed to investigate the effects of different shading levels and drought stress on soybean yield. A factorial experiment was conducted in a randomized complete block design with three replications during the 2024 growing season at Sari Agricultural Sciences and Natural Resources University, Mazandaran, Iran. The treatments included four shading levels (0 (control), 80% (SH-80), 50% (SH-50), and 30% (SH-30) light transmission) and three drought stress levels (no stress (NDS), irrigation withheld at flowering stage (DSF), and irrigation withheld at pod development stage (DSP)). The interaction between shading and drought stress significantly influenced key agronomic traits, including the number of pods per plant, number of empty pods, 1-seed and 2-seed occurrence, 100-seed weight, and grain yield (P ≤ 0.01). The combination of SH-30 and NDS resulted in the highest pod number (79.1), hundred-seed weight (16.7 g), and grain yield (1170.2 kg/ha). Moreover, the greatest chlorophyll a and b content (0.9 and 0.33 mg.g-1, respectively) was observed under the same treatment. Additionally, the highest water productivity index (WPI) was recorded under SH-50 and DSF treatments (2.4 kg.m-³), while the highest water productivity of evapotranspiration (WPET) was achieved with SH-30 and NDS treatments (1.8 kg.m-³). Overall, the findings revealed that applying shading nets, particularly SH-30 and SH-50, can enhance soybean yield and physiological yield under both normal and drought-stressed conditions. Therefore, the use of shading nets can be recommended as an effective strategy to alleviate the adverse effects of water stress on soybean growth.
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