2. Institutional Publications

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    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
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    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
    An 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.
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    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, R
    An 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.
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    Comparative study of soil and foliar application of urea on sesamum
    (Kerala Agricultural University, 1975) Nair, N R; Santhakumari, R; Gopalakrishnan, R
    An 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.
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    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
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    Estimation of loss of major plant nutrients in percolation in rice fields
    (Kerala Agricultural University, 1976) Nair, R R; Pisharody, P N; Gopalakrishnan, R
    In 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.
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    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
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    Herbicidal control of weeds in pineapple variety kew
    (Kerala Agricultural University, 1976) Balakrishnan, S; Pillai, G R; Kannan, K; Gopalakrishnan, R
    A 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.
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    Pollination studies in pineapple varieties
    (Kerala Agricultural University, 1976) Gopimony, R; Balakrishnan, S; Kannan, K; Gopalakrishnan, R
    study 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.
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    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
    In 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.