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.
Groundnut is an important legume of tropical world where phosphorus (P) deficiency is one of the limiting factors affecting productivity and use of P-efficient genotype is the solution. Thus P-efficiency among seventy groundnut genotypes was studied under P-deficit (-P) and adequate-P (+P) condition by recording yield and its attributes and calculating various P-efficiency indices. Significant differences among groundnut genotypes, P levels and their interactions were observed for all the traits and the range of pod yield was 3.4-10.5 g plant-1 under-P and 4.1-12.8 g plant-1 at +P, 100 seed mass was 23-68 g. The range of phosphorus stress factor (PSF) was-40 to 39 in pod (PSF p) and-142 to 45 in haulm (PSF h), P efficiency (PE) was 0.61-1.40 in pod (PE p) and 0.55-2.42 in haulm (PE h) and agronomic P use efficiency was 14 to 29. Genotypes were divided into efficient, inefficient and moderate based on the P-efficiency index (PEI), but into efficient and inefficient, responder and non-responder, using PEI and pod yielding potential.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.