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EFFECT OF DIFFERENT CONTROL METHODS OF IMPER ATA CYLINDRICA ON COCONUT (COCOS NUCIFERA) YIELD IN LOW COUNTRY DRY ZONE OF SRI LANKA

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Coconut Research Institute of Sri Lanka
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  • Design

Abstract

Five methods of control of Imperata cylindrica (L.) Beauv namely a)harrowing with disc harrow, b) Glyphosate (N- Phosphonomethyl Glycine)2.88 kg a.i / ha, c) Glyphosate 1.44 kg a.i/ha, d) circle weeding withGlyphosate (1.44 kg a.i/ha) along with mechanical slashing rest of the area,and e) mechanical slashing were evaluated to determine the cost effectivemethod of control of Imperata cylindhca, and to ascertain the effect ofcoconut -Imperata competition on yield of coconut in Low Country Dry zonein Sri Lanka. An unweeded plot was used as the control. Experiment wasarranged in a Randomized Complete Block design with three replicates.Treatments were applied twice a year in six months interval. Glyphosate atthe rate of 2.88 and Glyphosate 1.44 kg a.i/ha gave a significant reduction(P

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