Impact of modified microclimate on the performance of Green gram (Vigna radiata L.) under different planting systems in the Upper Brahmaputra Valley zone of Assam
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Date
2025-04
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Publisher
Triveni Enterprises
Abstract
Aim: To study the impact of modified crop microclimate on the performance of green gram in a representative district of the Upper Brahmaputra Valley zone of Assam. Methodology: A field experiment was conducted during the summer of 2021 in the ICR Farm of Assam Agricultural University, Jorhat to study the impact of modified microclimates on the growth and yield of green gram under different planting systems. The variety SGC-16 was grown in a split-plot design th with 3 dates of sowing at an interval of 15 days starting from 20 th February (D ) till 20 March (D ) in main plots and three planting1 3 systems, i.e., P - ridge and furrow, P – raised bed with two rows1 2 in bed and P –flat bed in sub-plot treatment, with three3 replications following recommended agronomic practices. Results: The average soil moisture content in the upper 30 cm soil profile was highest in D (80.4±11.8 mm), followed by D3 2 (75.0±7.8 mm) and D (66.4±6.9 mm). Compared to P , the1 3 decrease in weekly evening soil temperatures under P and P1 2 was up to 2.1 and 1.4°C, respectively. Irrespective of sowing dates the mean maximum leaf area index (2.06) and higher pods per plant (16.7) were recorded under P . The seed yield1 under different sowing dates and planting systems ranged from -1 -1 286.3 to 681.0 kg ha with an overall mean of 509.8 kg ha . Correlation studies between seed yield, LAI and soil moisture in the upper 30 cm soil profile confirmed the existence of a significant and positive correlation between them. th Interpretation: The yield of the crop planted on 20 March (D ) under ridge and furrow planting (P ) was maximum, facilitated by optimum weather3 1 conditions with improved soil hydrothermal regimes at various phenological stages of entire crop growing season.
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Keywords
Green gram, Microclimate, Moisture stress, Planting system, Seed yield
Citation
Pathak K, Neog P, Medhi K, Deka RL, Sarmah K, Kurmi K, Bal SK, Sultana A. . Impact of modified microclimate on the performance of Green gram (Vigna radiata L.) under different planting systems in the Upper Brahmaputra Valley zone of Assam. Journal of Environmental Biology. 2025 Apr; 46(2): 308-317