Distribution, stability and trend of rainfall in South Indian coffee tracts
An analysis of rainfall for a forty-year-period (1950-89) in 11 zones of three major coffee growing states of South India shows that the annual rainfall of 1400-3371mm of these zones is received in 80-127 rainy days. July is the wettest month in all the zones excepting in Biligiris, Niligiris, Shevroys and Pulneys. Seven zones fall under S.W. monsoon area receiving 69-80 per cent of annual rainfall during June-September. Summer showers, which are considered to be critical for coffee production, range between 9 and 17 per cent of annual rainfall. Generally, winter rainfall exhibits high instability while S.W. monsoon is found to show the least variability in terms of coefficient of variation. The chance of getting 25mm rainfall in February are more than 50 per cent only in the case of Pulneys and Niligiris of Tamil Nadu, and in all other zones it is found to be far less. However, the chance in March are brighter in all zones of Kerala and Tamil Nadu (more than 90 per cent) than in Karnataka (less than 25 per cent) where a 10mm rainfall seems to have a higher probability. In April, rainfall of 25mm is almost a certainty in all the zones. A steady decline of rainfall, from first to fourth decade, ranging from 3 to 24 per cent is noticed in majority of the zones excepting Niligiris and Pulneys.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1993
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| Subjects: | ZONAS CAFETERAS, PRECIPITACION ATMOSFERICA, INDIA, |
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