Harnessing Potential of Summer Chickpea (Cicer arietinum L.) Under Drought Prone Shallow Basaltic Soils of Semi-Arid Tropics

Chickpea cultivation during the summer season in the semi-arid tropics offers a potential strategy to enhance cropping intensity, but high temperatures and moisture stress remain major constraints to productivity. A three-year field study was undertaken to assess phenological responses, reproductive efficiency, yield performance and yield stability of nine chickpea genotypes under summer conditions. The short-duration crop recorded substantially reduced grain yield, though with wide genotypic variation ranging from 77 - 651 kg ha(-1). Genotypes JG-14 and IPC 06-11 consistently achieved the highest yields (> 540 kg ha(-1)), primarily due to a higher number of seeds per plant. Reproductive efficiency of the summer crop was impaired, with a mean pollen viability of 63% and pollen germination of 31%. However, JG-14, IPC 06-11 and ICE-15654-A maintained > 70% pollen viability and > 40% pollen germination, coupled with cooler canopy temperatures and relative water content exceeding 60%, indicating superior physiological resilience. Correlation analysis revealed strong negative associations between phenological traits (days to flowering, maturity and reproductive duration) and grain yield, while elevated temperatures during both vegetative and reproductive phases further suppressed productivity. Stability analyses identified JG-14 as the most stable and high-yielding genotype across environments, whereas IPC 06-11 and ICE-15654-A performed comparatively better under relatively cooler and more humid spring conditions. Overall, the study highlights considerable genotypic variability, with JG-14, IPC 06-11 and ICE-15654-A emerging as promising candidates for summer chickpea cultivation in the semi-arid tropics. Further evaluation of a broader germplasm base is warranted to identify lines with stable yield performance under resource-limited summer environments.