Ramachandran Nair, VSurendran, KKAU2020-02-102020-02-101985http://krishikosh.egranth.ac.in/handle/1/5810142788PGTo evolve a suitable nitrogen management schedule for rice variety Lakshmi an experiment was conducted in a cultivator's field at Attingal, Trivandrum, during the grand mundekan (ragi) season of 1983-34. The treatment a consisted of four graded levels of nitrogen ranging from 20 to 80 kg/ha and four times of application with one control. The experiment was replicated thrice in a Factorial Randomised Block Design. Growth characters such as plant height, tillering, leaf area index, crop growth rate end dry matter production were the highest at 80 kg IT/ha* Height, leaf area index end dry matter yield were the highest with three splits, but tiller production and crop growth rate were the highest with two splits of nitrogen. Application of 80 kg H/ha gave the highest number of panicles, where as number of filled grains aid spikelsts were maximum with 40 kg nitrogen. The highest weight of thousand grains and panicles on! the lowest percentage of unfilled grains were observed with 60 kg nitrogen. Grain end straw yields wore tho highest with 60 end 80 kg E/ha respectively. Application, of nitrogen, at 50,25 and 23 per-cant at transplanting, active tillering end panicle initiation stages respectively produced the highest grain and straw yields Application of 80 kg N/ha in equal splits at active tillering end penicle initiation at age a recorded maximum grain protein content Nitrogen use efficiency was the highest with 20 kg nitrogen and it gradually decreased with increased rates Nitrogen phosphorus and potassium apt eke increased with incremental doses of nitrogen at all growth stages. Three split application recorded the highest nitrogen end potassium uptake at active tillering end panicle initiation Three split application of 60 kg N/ha as 50%, 25%and 25% at transplanting active tillering and panicle initiation stages respectively recorded the highest not return and cost benefit ratio.ennullThesis