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EFFECTS OF BIMONTHLY RAINFALL ON COCONUT YIELD IN THE LOW COUNTRY INTERMEDIATE ZONE (IL,) OF SRI LANKA

Authors:

T. S. G. Peiris ,

COCOS, LK
About T. S. G.
Coconut Research Institute, Lunuwila, Sri Lanka.
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R. R. A. Peries

LK
About R. R. A.
Coconut Research Institute, Lunuwila, Sri Lanka.
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Abstract

Coconut yields in Sri Lanka show considerable fluctuation between years mainly due to
variation in the distributions of major climatic parameters such as rainfall, solar radiation and
relative humidity. The effect of current weather is usually reflected on the yields of the following
year. However, the degree of. influence of these variables on coconut yield is yet unknown. An
attempt was made to study the influence of intensity and distribution of rainfall in two-monthly
sub-periods of the previous year on nut yield at Ratmalagara Estate in the Low Country Dry
Intermediate Zone (75% annual rainfall probability > 1500) of Sri Lanka. Rainfall during January/
February was found to be the most influential factor on the subsequent years total yield and the
yield increased with increasing rainfall. The rainfall during March/April had a similar effect where
around 400 mm was found to be sufficient. The high intensity of rainfall during May/August
adversely affected the crop, where amount in excess of 450 mm was not utilized to increase the
yield. The impact of rain during July/August was minimal. High rainfall during September/
October and November/December had a depressing effect on yield, and this was very significant
with respect to the November/December rainfall. A multiple regression model with R = 89% was
developed using a combination of some parameters of bimonthly rainfall which would be useful
in determining the potential yield and to explain yield fluctuation between years to a certain
degree.
How to Cite: Peiris, T.S.G. & Peries, R.R.A., (2010). EFFECTS OF BIMONTHLY RAINFALL ON COCONUT YIELD IN THE LOW COUNTRY INTERMEDIATE ZONE (IL,) OF SRI LANKA. COCOS. 9, pp.1–11. DOI: http://doi.org/10.4038/cocos.v9i0.2123
Published on 27 Jul 2010.
Peer Reviewed

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