In a field study, the effect of iron source through foliar as well as basal application was studied on lime induced iron-deficiency chlorosis (LIIC), chlorophyll content, nitrate reductase activity, available Fe and micronutrients in groundnut.The visual chlorotic rating screen of various Fe-efficient and Fe-inefficient cultivars clearly identified Fe-efficient and Fe-inefficient. Tirupati-4 was showing symptoms of chlorosis and was Fe-inefficient. Fe absorption capacity varied among cultivars. Applications of iron increased active Fe content in LGN-2 by 5.6 % and 163.18% in CSMG-84-1 respectively. A significant increase in chlorophyll content (10%) and nitrate reductase (110%) was observed with foliar spray of FeSO 4 . A significant damage of lipid peroxidation was observed in absence of iron which was improved by 37% in Tirupati-4 and 16.67% in CSMG-84-1 by foliar and basal supplementation of Fe, respectively. A strong correlation among the Fe, Mn, Zn and K depicted ionomic interaction with different treatments. Based on the ion absorption capacity and the level of chlorosis, the groundnut genotypes were grouped as tolerant, moderately tolerant and sensitive to iron chlorosis.

The screening of 114 groundnut (Arachis hypogaea L.) genotypes (61 advanced breeding lines and 53 releasedcultivars) was undertaken in the screening plots to identify the iron-efficient genotypes tolerant to lime-induced ironchlorosis.The crop was grown and the intensity of chlorosis of top five leaves was rated for visual chlorotic rating(VCR) score on a 1-5 scale and the percentage of plants showing deficiency symptoms at 10, 20, 30 and 65 daysafter emergence during the cropping season. The tolerant genotypes had shown significantly lower VCR, higher SoilPlant Analysis Development (SPAD) chlorophyll meter reading and chlorophyll values, active Fe, and high yieldcompared to the sensitive ones. The correlation of visual chlorosis range with SPAD, chlorophyll and available ironcontent along with the mineral nutrients like, Fe, Zn, Mn, K, and P clearly identified the groundnut genotypes astolerant, moderately tolerant and sensitive to iron chlorosis. Based on various parameters, out of 114 genotypes, 22were grouped as tolerant, 48 moderately tolerant, 32 normal and 12 sensitive. Maximum variability was obtained ingroundnut genotypes for Fe and fodder weight.