Browsing by Author "Nair, R R"
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ArticleItem Open Access Companion cropping in the rainfed uplands(Kerala Agricultural University, 1979) Thomas, A I; Nair, R R; KAUArticleItem Open Access Comparative efficiency of new herbicides for weed control in direct seeded rice fields(Kerala Agricultural University, 1974) Nair, R R; Vidyadharan, K K; Pisharody, P N; Gopalakrishnan, RArticleItem Open Access Economics of intensive cropping in double crop wetlands(Kerala Agricultural University, 1977) Nair, R R; Pisharody, P N; Gopalakrishnan, R; KAUA field trial was conducted at the Rice Research station, pattambi during 1969—70 and 1970 -71 in order to study the feasibility of raising more than 2 crops of rice in the double crop wet lands. Eight crop sequences were tried with Annapoorna (early duration) and IR 8 (medium duration) as test varieties. The study indicated clearly that 3 early duration rices could be raised in the double crop wet lands during the usual cropping span of 9 months from May through January. This cropping pattern, however, was not profitable at the levy price of Rs. 0.74 per kg of paddy. The study also showed that raising 2 medium duration rices in succession was the most profitable cropping pattern for the double crop wet lands under the existing soil and climatic conditions of pattambi which represent the middle laterite region of Kerala.ArticleItem Open Access Effect of age of seedlings and nitrogen levels on annapurna rice(Kerala Agricultural University, 1975) Pillai, G R; Nair, R R; Pisharody, P N; Gopalakrishnan, R; KAUAn investigation was undertaken to study the effect of age of seedlings and nitrogen levels on Annapurna rice at the Rice Research Station, Pattambi, during first and second crop seasons on 1969-70 and 1970-71. The results revealed that the optimum age of seedlings for transplanting was 15 days during first crop season and 20 days during second crop season. Response due to nitrogen was significant only up to 80 Kg N/ha.ArticleItem Open Access Effect of fractional application of lime on the growth and yield of rice (Oryzo saliva L.) in the acidic lateritic loam soil of Pattambi(Kerala Agricultural University, 1974) Gopalakrishnan, R; Pisharody, P N; Nair, R R; Pillai, G R; KAUArticleItem Open Access Effect of spacing, number of seedlings per hill and nitrogen on growth and yield of Annapurna rice (Oryza saliva L.)(Kerala Agricultural University, 1972) Filial, G R; Nair, R R; Pisharody, P N; Qopalakrishnan, R; KAUArticleItem Open Access Estimation of loss of major plant nutrients in percolation in rice fields(Kerala Agricultural University, 1976) Nair, R R; Pisharody, P N; Gopalakrishnan, R; KAUIn an investigation conducted at the Rice Research Station, Pattambi, it was found that appreciable amounts of nitrogen, phosphorus and potash moved out of the root zone of rice plants in percolating water. The magnitudes of loss of these nutrients through percolation during the autumn and winter seasons of 1973-74 are reported in this paper.ArticleItem Open Access Influence of applied nitrogen on grain yield, protein content and milling outturn in transplanted rice(Kerala Agricultural University, 1976) Pisharody, P N; Nair, R R; Gopalakrishnan, R; KAUArticleItem Open Access Investigations on phosphate and potash manuring of transplanted rice(Kerala Agricultural University, 1981) Pisharody, P N; Nair, M S; Nair, R R; Seshadrinath, S; KAUArticleItem Open Access Investigations on the effect of heavy manuring of rice seed beds(Kerala Agricultural University, 1977) Nair, R R; Pillai, G R; Pisharody, P N; Gopalakrishnan, R; KAUTwo field experiments were conducted at the Rice Research Station, Pattambi on seed bed manuring using IRS and Jaya as test varieties. The first experiment (1969—70, 1970—71) aimed to study whether nitrogen application in the main field (0, 40, 80," 120 kg/ha) could be reduced by phosphate manuring (0, 30, 60, 90 kg/ha) of the seed bed. The results showed that response to nitrogen was independent of the dose of phosphours applied in the seed bed. The effect of nitrogen (0, 40, 80 kg/ha) phosphorus (0, 25, 50 kg/ha) and potash (0, 25, 50 kg/ha) individually and in factorial combinations, on the productivity of rice seedlings was investigated in tde second experiment (1970- 71, 1971—72). The results conclusivly proved that applied nutrients had no significant influence on grain yield.ArticleItem Open Access Management requirements of overaged rice seedlings(Kerala Agricultural University, 1981) Nair, R R; Kuriakose, T T; Saifudeen, N; KAUArticleItem Open Access New pre-emergence chemicals for weed control in flooded rice(Kerala Agricultural University, 1978) Nair, R R; Kuriakose, T F; Saifuddin, N; KAUArticleItem Open Access Response of rice to phosphate manuring in a waterlogged laterit1c sandy loam of Kerala(Kerala Agricultural University, 1970) Nair, R R; Pisharody, P N; KAUArticleItem Open Access Response of upland rice to nitrogen as influenced by bulk density of soil(Kerala Agricultural University, 1976) Nair, R R; Pisharody, P N; Pillai, G R; Gopalakrishnan, R; KAUArticleItem Open Access Slow release nitrogen fertilizers for transplanted rice(Kerala Agricultural University, 1977) Nair, R R; Tomy, P J; KAUArticleItem Open Access Weed control in rice under semi-dry system(Kerala Agricultural University, 1986) Sudhakara, K; Nair, R R; KAU