Abstract

                                An incubation and pot culture experiments were conducted during kharif season of 2017-18 at Department of Soil Science and Agricultural Chemistry, TNAU, Coimbatore to assess the nutrient release pattern from different macronutrient mixtures in soil and to evaluate the effect of crop specific nutrient mixtures on yield and quality of redgram (Cajanus cajan L.) under irrigated condition. The experiments were laid out in completely randomized design (CRD) with ten (incubation) and eleven (pot culture) treatments. The treatments comprised of two sources of nitrogenous fertilizers viz., Urea and Calcium ammonium nitrate (CAN), one source of phosphatic fertilizer viz., Single Superphosphate (SSP), three sources of both nitrogenous and phosphatic fertilizers viz., Di-Ammonium Phosphate (DAP), Mono-Ammonium Phosphate (MAP) and Ammonium Sulphate Phosphate (ASP) and two sources of potassic fertilizers viz., Muriate of Potash (MOP) and Sulphate of Potash (SOP). The results of incubation study revealed that application of CAN + DAP + SOP mixture resulted to higher release of nitrogen (2.78 to 18.51 kg ha-1), phosphorus (4.16 to 22.06 kg ha-1) and potassium (0.66 to 23.09 kg ha-1 ) from 1 to 60 days of incubation (DOI)and the same treatment recorded higher plant height (95.2 cm), number of primary branches (9 plant-1), number of root nodules (19 plant-1), dry matter production ( 129 g plant-1), number of pods ( 77.9 plant-1), number of seeds (4.2 pod-1) and 100 seed weight (14.5 g), seed yield (772 kg ha-1), stalk yield (3210 kg ha-1) and harvest index of redgram (19.92 %) in pot culture experiment at harvest stage.

Key words : Incubation, Nutrient mixtures, Fertilizers, Yield attributes, Dry matter production, Harvest index.