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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

Authors:

A. D. Samarajeewa ,

COCOS, LK
About A. D.
Coconut Research Institute, Lunuwila, Sri Lanka.
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R. P. B. S. H. S. Senaratna,

About R. P. B. S. H. S.
Coconut Research Institute, Lunuwila, Sri Lanka.
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K. C. P. Perera

LK
About K. C. P.
Coconut Research Institute, Lunuwila, Sri Lanka.
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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 with
Glyphosate (1.44 kg a.i/ha) along with mechanical slashing rest of the area,
and e) mechanical slashing were evaluated to determine the cost effective
method of control of Imperata cylindhca, and to ascertain the effect of
coconut -Imperata competition on yield of coconut in Low Country Dry zone
in Sri Lanka. An unweeded plot was used as the control. Experiment was
arranged in a Randomized Complete Block design with three replicates.
Treatments were applied twice a year in six months interval. Glyphosate at
the rate of 2.88 and Glyphosate 1.44 kg a.i/ha gave a significant reduction
(P<0.05) of weed biomass when compared to other treatments. A significant
increase (P< 0.05) of coconut yield was observed due to control of Imperata
in plots with these treatments at two years after imposition of treatments
.When cumulative average yield of coconut was considered for three
consecutive years, control of Imperata with Glyphosate gave a 54%
increase (P'O.01) of nut yield when compared to the unweeded control.
Cost - benefit analysis of different control methods revealed that the
application of Glyphosate at the rate of 1.44 kg a.i/ha was the most cost
effective (undiscounted B/C ratio: 5.9) method of control of Imperata in
sandy soils in the Low Country Dry Zone of the Coconut Triangle.
How to Cite: Samarajeewa, A.D., Senaratna, R.P.B.S.H.S. & Perera, K.C.P., (2010). EFFECT OF DIFFERENT CONTROL METHODS OF IMPER ATA CYLINDRICA ON COCONUT (COCOS NUCIFERA) YIELD IN LOW COUNTRY DRY ZONE OF SRI LANKA. COCOS. 16, pp.37–42. DOI: http://doi.org/10.4038/cocos.v16i0.2195
Published on 12 Aug 2010.
Peer Reviewed

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