2. Institutional Publications

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    Management requirements of overaged rice seedlings
    (Kerala Agricultural University, 1981) Nair, R R; Kuriakose, T T; Saifudeen, N
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    Effect of nitrogen management practices on ammonia volatilization losses in transplanted rice
    (Kerala Agricultural University, 1994) Anila Kumar, K; Menon, P K G; Sivakumar, C
    Field experiments were conducted in kharif and rabi seasonsto study the volatilization losses under different nitrogen management practices in transplanted rice. The treatments receiving application of urea 111 three splits and the combined applica tion of urea and green leaves in 1:1 proportion on N basis recorded the lowest N loss through volatilization in both seasons. Seventy five per cent of ammonia volatilization was recorded within 6 days after fertilization. The loss was more during rabi season and the losses significantly increased with increase in pi I, I ICC>3~ and Nl Lj-N content of flood water.
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    Efficiency of pre-emergence herbicides in transplanted rice
    (Kerala Agricultural University, 1994) Savithri, K E; Chidananda Pilial, M R; Tomy, P J
    Experiments conducted at the Regional Agricultural Research Station, Pattambi during die first (kharif) and second (rabi) crop seasons of 1983-84 and 1984-85 revealed that weed growth and crop-weed competition were below the threshold level in transplanted rice. However, among the different herbicides tried, application of granular formulation of butachlor (Delchlor 5G) © 1.5 kg ai ha six days after transplanting was found to be die most effective for controlling weeds in transplanted rice.
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    Changes in nutrient availability and uptake in transplanted rice under shallow and deep submergence
    (Kerala Agricultural University, 1994) Anilakumar, K; Johnkutty, I; Menon, P K G; Sivakumar, C
    Field experiments were conducted to study the changes in electro-chemical properties and nutrient availability in soil and soil solution in transplanted rice during kharif and rabi season under deep (20 cm) and shallow (10 cm) submergence, respectively. The pH of soil and soil solution increased up to 30 days after transplanting (DAT), then decreased and again increased slightly at 50% flowering stage. Redox potential of soil decreased rapidly during kharif season while during rabi season, the values increased up to 30 DAT and thereafter stable values were recorded. Concentration of nutrients in soil and soil solution decreased with crop growth except in the case of soil P during kharif season and soil solution Ca during both the seasons. Availabilit y of nutrients in soil and soil solution except for P and Mg was more during kharif season, while the nutrient uptake was higher during rabi season. Application of P and K during rabi season was effective in areas where P and K were applied once in two seasons. Significant difference in yield was obtained only during rabi season.