Effect of High Minimum Temperature and Enriched Night CO2 on Yield and Seed Quality of Black Gram (Vigna mungo) under Soil Plant Atmospheric Research (SPAR).

Background: Black gram is a leguminous plant species. This pulse crop has been grown on the Indian subcontinent for a long time. Black gram a drought-resistant crop that grown both in the summer and the winter, usually in rotation with rice but occasionally in mixed farming. The objective of this research was to (i) quantify the short-term effects of high minimum temperature and enriched night CO2 (HMT and enCO2) on yield contribution factors and (ii) quantify seed quality parameters employing biochemical analysis. Methods: An investigation was carried out during summer 2021 and 2022 to evaluate the effect of high minimum temperature (ambient+3°C) and enriched night CO2 (600 ppm) (HMT and enCO2) on yield and seed quality parameters of black gram (Vigna mungo) under soil plant atmospheric research (SPAR) and ambient condition at Agro Climate Research Centre, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu with ten treatments which were replicated thrice. Result: Black gram yield and quality parameters were significantly (p=0.05) reduced under HMT and enCO2. Pooled data from two successive summer seasons revealed that stress from (i) 50 to 56 DAS (Days after sowing), the number of flowers dropped per plant significantly increased by 24% and pod setting percent decreased by 19.9% (ii) 43 to 49 DAS, grain yield and biomass/plant decreased by 25.4% and 16.2%, respectively. Seed quality parameters revealed that stress during 50 to 56 DAS, seed protein, total sugar content, polyphenols, calcium and iron decreased by 19.4%, 23.7%, 16.2%, 29.6% and 30.2%, respectively. The proline and phytic acid were statistically reduced by 53.9% and 59.1%, respectively stress during 50 to 56 DAS. Stress from 64 to 70 DAS, seed moisture content was significantly decreased by 32.1%. Overall, black gram yield and seed quality was negatively affected on two treatments: stress imposed from 43 to 49 DAS (T7) and stress imposed from 50 to 56 DAS (T8) (50% flowering to pod filling stage). [ABSTRACT FROM AUTHOR]