optimizing irrigation scheduling and nutrient requirement for groundnut arachis hypogaea l by soil amendment with charred rice husk in conjugation with arbuscular mycorrhiza

Abstract

Field experiments were conducted to optimize the irrigation scheduling and newlinenutrient management practices for groundnut (Arachis hypogaea L.) under irrigated newlinecondition during summer, kharif and rabi season of 2017 at Central Farm, newlineAgricultural College and Research Institute, Madurai, Tamil Nadu. The newlineexperiments were laid out in split plot design with three replications. Bunch variety newline VRI 2 was chosen for the experiments. Soil of the experiment fields were sandy newlineclay loam in texture with low available nitrogen, medium available phosphorus and newlinehigh available potassium. The main plot treatments consisted of three levels of newlineirrigation scheduling namely 0.8 IW/CPE ratio (I1), 0.6 IW/CPE ratio (I2) and newline0.4 IW/CPE ratio (I3) and sub-plots consists of four nutrient management practices newlinei.e. N1- 75% of RDF with 5 t of charred rice husk, N2 - 50% of RDF with newline5 t of charred rice husk, N3 - 75% of RDF with 5 t of charred rice husk along with newlineseed treatment of arbuscular mycorrhiza and N4 - 50% of RDF with 5 t of charred newlinerice husk along with seed treatment arbuscular mycorrhiza. newlineAmong the irrigation scheduling and nutrient management practices, the pod newlineyield was highest with the treatment combination of irrigation scheduling at newline0.8 IW/CPE ratio along with 75% of RDF and 5 t of charred rice husk as basal with newlineseed treatment of arbuscular mycorrhiza with a pod yield of 2003, 2099 and newline2063 kg ha-1 during summer 2017, kharif 2017 and rabi 2017 season newlinerespectively. Whereas, the lowest pod yield was recorded with irrigation scheduling newlineat 0.4 IW/CPE ratio with 75% of RDF and 5 t of charred rice husk. newlineThe soil enzyme viz., arylsulphatase enzyme, phosphatase enzyme and newlinedehydrogenase enzyme activity were higher in the treatment of irrigation newlinescheduling at 0.8 IW/CPE with application of 75% of RDF and 5 t of charred rice newlinehusk along with seed treatment of arbuscular mycorrhiza. The lowest soil enzyme newlineactivity was recorded with irrigation scheduling at 0.4 IW/CPE ratio and application newlineof 50% of RDF with 5 t of charred rice husk. newline