Browsing by Author "Yusuf, M."

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    Moisture Movement Studies in Drip Irrigation
    (2007-02) Dhanapal, R.; Yusuf, M.; Bopaiah, M.G.
    The study of moisture movement as a function of elapsed time was undertaken to determine the boundaries of the irrigated soil volume from a single point source of dripper with three quantities of irrigation water (Ql * 33%, Q2 « 66% and Q3 « 100% of daily E O) and four discharge rates (D^l, D2*s3rr D3*3 and D^ 4 lit/hr,) In laterite soil at CPCRI, Kasaragod* The horizontal and vertical soil moisture distribution was monitered by gravimetric method and also by excavating trenches after specified time.
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    Moisture Movement Studies Under Drip Irrigation
    (2007-02) Dhanapal, R.; Yusuf, M.; Bopaiah, M.G.
    Field studies were conducted to determine wetting fronts and volume of active root zone in coconut basin (manuring -circular area around the bole) wetted with three quantities of water application, Ii-33% of Eo, h-66% of E0 and 13-100% of E0) at a fixed emitter (dripper) discharge rate of 2 litrcs/hr. The efficiency of placing emitters on surface and sub-surface, on water movement and volume of basin wetted was also studied with irrigation equal to 100% of Eu. Vertical and horizontal movement of water and volume of active root-zone in coconut basin wetted were directly related to the quantity of water applied. The vertical and horizontal wetting fronts were 90 and 51 cm at Ii, 100 and 60 cm at I2 after 30 days of regular irrigation, and 120 and 65 cm at I3 after 5 days irrigation. The percentage volume of active root zone wetted was 19.1, 21.5 and 28.6 at Ii, I2 and I3 rates of water application during the periods. The vertical and horizontal fronts under surface and sub-surface placed emitters were 64 and 44 cm and 90 and 52 cm, respectively after a weeks irrigation. The percentage volume of active root zone wetted was 13.6 and 18.2 respectively under surface and sub-surface placed emitters. The sub-surface placement wetted 35% more volume than the surface placed emitter.