MADRAS AGRICULTURAL JOURNAL

Prediction of Post-harvest Soil Test Values and Fertilizer Calibrations for a Maize Based Cropping Sequence under Integrated Plant Nutrition System

Abstract

                                Field experiments were conducted based on Inductive cum targeted yield concept on Typic Haplustert soils (Pilamedu series - black calcareous) to predict the post-harvest soil test values for prescribing soil test crop response based fertilizer doses under Integrated Plant Nutrition System (STCR-IPNS) for maize based cropping sequence. The experiment comprised of 24 treatments with four levels each of N (0,100,200 and 300 kg ha-1), P2O5 (0,40,80 and 120 kg ha-1) and K2O (0,40,80 and120 kg ha-1) and three levels of FYM (0, 6.25 and 12.5 t ha-1) for the test crop maize (TNAU Maize hybrid CO 6) laid out in fractional factorial design. Making use of the experimental data on initial and post-harvest soil test values, fertilizer doses and the grain yield obtained or uptake of N,P and K by maize, Post-Harvest Soil Test Values (PHSTVs) prediction equations with high R2 values (>0.90) were developed, which could be used with confidence for the prediction of post-harvest KMnO4-N,Olsen-P and NH4OAc-K. Using the predicted PHSTVs after kharif maize, soil test based fertilizer prescription for desired yield target of succeeding crop viz., cotton could be prescribed.

Key words : Post harvest soil test values, Maize based cropping sequence, STCR-IPNS, Vertisol

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

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.

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.