What type of study is this?

August 16, 2025Open Access

Assessment of Agrometeorological Indices in Summer Groundnut Cultivars in South Saurashtra Agro-Climatic Zone of Gujarat

Key Points

The study shows that the 4th SMW sowing time resulted in the highest Growing Degree Days (2230 ℃ day).
Among the groundnut varieties, GJG-31 showed the lowest GDD and the highest heat use efficiency at 1.1 kg ha-1 day-1.
The study utilized a strip plot design to evaluate twelve treatment combinations across different sowing dates and groundnut cultivars.
Findings highlight the importance of optimal sowing time for maximizing agrometeorological indices and heat use efficiency.

Abstract

Aims: To study the agrometeorological indices, heat use efficiency and phenothermal index of summer groundnut cultivars. Study Design: Strip Plot Design. Place and Duration of Study: The experiment was taken in summer 2024 at Instructional Farm, Department of Agronomy, College of Agriculture, Junagadh Agricultural University, Junagadh Methodology: The experiment contained three replication and twelve treatment combinations, where horizontal plot consisted of four different sowing dates viz., D1: 4th SMW, D2: 6th SMW, D3: 8th SMW and D4: 10th SMW and vertical plot consisted of three different groundnut varieties viz., V1: GJG-31, V2: GG-34 and V3: GG-37. The study assessed several agrometeorological indices viz., Growing Degree Days (GDD), Photothermal Unit (PTU), Heliothermal Unit (HTU), Hygrothermal Unit-I (HgTU-I) and Hygrothermal Unit-II (HgTU-II). The study also evaluated the Heat Use Efficiency (HUE) and Phenothermal Index. Results: The study also evaluated the Heat Use Efficiency (HUE) and Phenothermal Index. The results showed 4th SMW sowing time takes the highest GDD (2230 ℃ day), PTU (27426 ℃ day hrs.), HTU (21579 ℃ day hrs.) and HgTU-I (151772 ℃ per cent) while 10th SMW sowing time takes highest HgTU-II (54048 ℃ per cent). HUE is highest in 6th SMW sowing time (1.16 kg ha-1 day-1) and Phenothermal Index is highest in 10th SMW (19.94 ℃ day hrs./day). Among the varieties, GJG-31 variety takes lowest GDD (2107 ℃ day), PTU (26226 ℃ day hrs.), HTU (20082 ℃ day hrs.) and HgTU-I (142443 ℃ per cent), HgTU-II (48686 ℃ per cent) and Phenothermal Index (17.99 ℃ day hrs./day). GJG-31 have the highest heat use efficiency (1.1 kg ha-1 day-1). Conclusion: Based on this experiment it can be concluded that the GDD, HTU, PTU and HgTU-I decreased with delay in sowing and it was highest in 4th SMW. The highest HgTU-II and phenothermal index was observed in 10th SMW. HUE was found highest in the 6th SMW. Among the varieties, GJG-31 variety takes lowest agrometeorological indices and Phenothermal Index to reach the maturity respectively and had the highest HUE.

Read Full Paperexternally

Demander à l'IA

Bookmark

View Full Paper