Influence of NPK fertilization on productivity and oil yield of groundnut (Arachis hypogaea) and sunflower (Helianthus annuus) in intercropping systems under irrigation

Abstract

A field experiment has been conducted at garden lands (Vertic ustochrept) of Agricultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore during Kharif (June to October) season of 2004 to ascertain the optimum nutrient requirement for groundmutsunflower intercropping system under irrigated conditions with replacement series to enhance the productivity of groundmuttsunflower inter cropping system. Groundnut was raised as main crop and sunflower was planted as intercrop with 3: 1 ratio. There were ten treatments viz., control (T.), 100% Recommended Dose of Fertilizers (RDF) to main and inter crops (T,), 100% RDF to main cropt no fertilizer to intercrop (T), 100% RDF to main crop-100% RDF to intercrop (T,), 100% RDF to main crop-50% RDF of intercrop (T,), T-50% RDF to intercrop as basal-50% N to intercrop as top dress (T,), T-50% N to intercrop as basal (T,), T,+ 100% PK of …