Chandrasekharan, PRegy, V JKAU2019-03-192019-03-191996171190http://krishikosh.egranth.ac.in/handle/1/5810098937PGAn experiment was conducted in the summer rice fallows of the Rice Research station, Kayamkulam during 1995 to study the effect of two levels of nitrogen (22.5, and 30 kg N ha-1) three levels of potassium (0, 22.5 and 30 Kg K2O ha-1) and two methods of application (75 per cent) each of nitrogen and potassium as basal and 25 per cent each of nitrogen and potassium as foliar spray at branching (m1), 50 per cent each of nitrogen and potassium as basal and 50 per cent each of nitrogen and potassium as foliar spray as to equal splits at branching and just before flowering (m2) on the growth, yield, oil and protein content, chemical composition of oil cake, nutrient status of soil after the experiment and economics. The study revealed that nitrogen affected LAI, LAD and NAR, but failed to have any influence on height of the plants, number of branches plant-1, height at which first bearing node formed, RGR, CGR, yield attributing characters, yield and oil content. Test weight, net return, benefit cost ratio, protein content, uptake of nitrogen, phosphorus and potassium at harvest were significantly affected by the applied levels of nitrogen. Nitrogen and phosphorus status of soil after the experiment decreased with higher levels of nitrogen. Higher level of nitrogen resu1 ted in higher nitrogen and phosphorus status of oil cake than lower level of nitrogen. Applied potassium affected most of the growth characters, protein content, oil content, nutrient uptake by the plant at harvest, nutrient status of soil after the experiment, nitrogen and phosphorus content of oil cake, but not the potassium content of oil cake. Oil content increased with increasing levels of potassium from 0 to 30 kg K2O ha-1, but protein content increased only upto 22.5 kg K2O ha-1. Further increase to 30 kg K2O ha-1 decreased the protein content. Methods of application failed to influence most of the growth characters except LAI, LAD,NAR, RGR and CGR. Yield attributes, yield, and quality attributes also had not influence by different methods of application, while nutrient uptake by the plants at harvest, total nitrogen and available potassium status of the soil after the experiment and phosphorous content of oil cake were affected significantly by different methods of application. Interaction between nitrogen and potassium significantly influenced height at first bearing node formed, LAI, LAD, NAR, RGR, CGR, grain yield, net return, benefit cost ratio, oil content, protein content, nutrient uptake by the plants and available potassium status of soil after the experiment, Interaction between nitrogen and methods of application had significantly influenced growth characters, uptake of nutrients and nutrient status of soil after the experiment, Phosphorus content of oil cake was only influenced by different combined application of nitrogen and methods of application.ennullThesis