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Department of Crop Physiology, S.V. Agricultural College, ANGRAU, Tirupati-517 502.
A field experiment titled “Physiological Efficiency of Groundnut Varieties Under Rainfed Conditions” was conducted during kharif 2024, using a Randomized Block Design (RBD) with ten groundnut varieties and three replications. The present study assessed physiological efficiency and yield performance of ten groundnut genotypes under rainfed conditions. Parameters such as SPAD Chlorophyll Meter Reading (SCMR), Specific Leaf Area (SLA), Crop Growth Rate (CGR), Relative Growth Rate (RGR), and Net Assimilation Rate (NAR) were recorded at different growth stages. Significant variations among physiological and yield traits were observed across the varieties. Kadiri Lepakshi and Nithyaharitha recorded higher SCMR, indicating better early photosynthetic capacity. Kadiri-6 showed higher SLA and CGR, while Visishta recorded the highest early-stage RGR. Himani and Kadiri Lepakshi exhibited strong NAR during pod-filling. Kadiri Lepakshi also recorded the highest pod yield (3333.3 kg ha-1), highlighting its physiological efficiency and yield potential under rainfed conditions.
KEYWORDS: SPAD Chlorophyll Meter Readings (SCMR), Relative Growth Rate (RGR), Crop Growth Rate (CGR), Net Assimilation Rate (NAR)