Climatic changes induce significant manifestations in the phenology of plants viz. defoliation and refoliation, flowering and fruiting, seasonal emergence of new whorls of leaves etc. The relegation of Hevea brasiliensis towards north and south of the equator is seen to influence the phenology. The expressions of phenological attributes and yielding pattern are in tune with the seasons/climate in the north and south of the equator. Rainfall and its distribution pattern, sunshine hours, mean temperature, wind velocity and evaporation are found to be crucial factors governing establishment, growth and yield of Hevea. Information gathered on phenology and yielding pattern from the non-traditional regions of China, Brazil, Cote d'Ivoire, French Guiana and Indonesia are compared in relation to differential geo-climates. While north of the equator has the lean yielding period during March-April, the south of the equator experiences lean period during September-February, which perhaps ensures stabilised supply of rubber in the international market. Keywords: Phenology, equator, geo-climate, Hevea, latitude, non-traditional areas, biotic stress, yielding pattern.
Priyadarshan et al. (Fri,) studied this question.
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