Browsing by Author "Gopalakrishnan, R"
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Item 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, RItem Comparative study of soil and foliar application of urea on sesamum(Kerala Agricultural University, 1975) Nair, N R; Santhakumari, R; Gopalakrishnan, RAn experiment to study the comparative effect of soil and foliar application of urea on yield of sesamum was conducted at the Oil Seed Research Station, Kayamkulam during 1971 - 72, Application of half the quantity of urea as basal and half the quantity through foliage 20 days after sowing has been found to be beneficial in increasing yield of sesamum. Spraying 3 .28 per cent urea 20 days after sowing has been observed to cause leaf scorching which reduced the yield considerably.Item Economics of intensive cropping in double crop wetlands(Kerala Agricultural University, 1977) Nair, R R; Pisharody, P N; Gopalakrishnan, RA 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.Item 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, RAn 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.Item 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 RItem Effect of planting seasons and the associated weather conditions on the incidence of the rice stem borer Tryporyza incertulas (Walker)(Kerala Agricultural University, 1972) Abraham, C C; Thomas, B; Karunakaran, K; Gopalakrishnan, RItem Estimation of loss of major plant nutrients in percolation in rice fields(Kerala Agricultural University, 1976) Nair, R R; Pisharody, P N; Gopalakrishnan, RIn 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.Item Grassy stunt epidemic in Kerala(Kerala Agricultural University, 1973) Gopalakrishnan, R; Gopalan, N; George, K M; Shanmughan, S NItem Herbicidal control of weeds in pineapple variety kew(Kerala Agricultural University, 1976) Balakrishnan, S; Pillai, G R; Kannan, K; Gopalakrishnan, RA herbicidal trial on pineapple variety 'Kew' was undertaken at the Pineapple Research Centre, Kerala Agricultural University Vellanikkara during the years 1974-76 to test the efficacy of diuron and bromacil at different doses- The herbicides in general effectively controlled a broad spectrum of weeds. Among different dosages tried, diuron 3 kg per hectare was more effective and the treatment gave significantly increased yield without producing any harmful effects to fruit quality. From the point of economics also, diuron 3 kg per hectare was more economical.Item 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, RIn an investigation conducted at the Rice Research Station, Pattambi using the early duration strain Thriveni as test variety, it was found th it application of a portion of nitrogen as top dressing at panicle initiation and booting stages increased grain yield, protein content and recovery of head rice. Protein content of grain and head rice recovery were observed to be closely related. Higher the protein content, greater was the recovery of head rice. On equal nitrogen basis, sulphur coated urea applied at planting was as effective as split application but significantly superior to ordinary urea when applied entirely at planting.Item Investigations on the competing ability of rice with weeds in the rainfed uplands(Kerala Agricultural University, 1975) Nair, K R; Pillai, G R; Pisharody, P N; Gopalakrishnan, RAn investigation was conducted at the Rice Research Station Paltambi during the early kharif seasons of 1972 and 1973 to find out the period of weed competiiion that an upland rice crop could stand without adverse effect on yield, The results revealed that the weed competition was more critical during the early vegetative phase of the crop and that weed free conditions favoured higher grain production. The longest period of weed competition that the upland rice could tolerate was 30 days from sowing without adverse effect on, yield.Item 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, RTwo 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.Item Occurrence of ‘tungro' virus disease of rice in Kerala(Kerala Agricultural University, 1973) Gopalakrishnan, R; Thomas, B; Shanmugham, S NItem Performance of new high yielding wheat varieties on the high altitude regions of Kerala(Kerala Agricultural University, 1978) Varkey, P A; Gopalakrishnan, RItem Performance of the rice varieties satya, soorya and suhasini in Kerala(Kerala Agricultural University, 1977) Karunakaran, K; Gopalakrishnan, RItem Pollination studies in pineapple varieties(Kerala Agricultural University, 1976) Gopimony, R; Balakrishnan, S; Kannan, K; Gopalakrishnan, Rstudy was undertaken using four varieties of pineapple to find out the time of anther debiscence and flower opening, time interval between various stages of flower development and best time of hand pollination for maximum seed production, i !u- time of flower opening and anther dehiscence in 'Kew* pineapple was found to be between 4 . 1 5 am and S a m The time interval between various stages of flower development was studied and found to be much shorter than those observed under Hawaii conditions. The results from the pollination trialshave shown that hand pollination in 'K.ew' variety of pineapple using pollen from three other compatible varieties can be successfully done at any time between 4.15 and 10.45 am.Item Relative efficiency of some plant products in controlling infestation by the Angoumois grain moth Sitotroga cerealella Olivier (Gelechiidae: Lepidoptera) infesting stored paddy in Kerala(Kerala Agricultural University, 1972) Abraham, C C; Thomas, B; Karunakaran, K; Gopalakrishnan, RItem Response of nendran banana to different levels of N, P and K(Kerala Agricultural University, 1977) Pillai, G R; Balakrishnan, S; Veeraraghavan, P G; Santhakumari, G; Gopalakrishnan, RExperiments were conducted to study the response of nendran banana to different levels of N, P and K at the Banana & Pineapple Research Station, Kannara for five consecutive seasons from 1963 — 64. The results revealed that the nutrients N and K exerted a significant positive influence on fruit number and bunch weight. The optimum dose of N and K2O corresponding to maximum yield of fruit has been worked out as 191, and 301 g per plant respectively. The economic optimum dose according to to the prevailing market rate has been worked out as 133 and 260 g of N and KSO respectively per plant per year.Item 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, RItem Storage leaf of rice seeds of some high yielding varieties in a high humid region(Kerala Agricultural University, 1976) Radhakrishnan, T C; Sukumara Dev, V P; Varkey, P A; Gopalakrishnan, R