Effect of Climatic Factors on Oleoresin Yield from Chir Pine (Pinus roxburghii Sargent)

Chir pine (Pinus roxburghii Sargent) is commercially tapped for oleoresin in India. An experiment was laid out to elucidate the relationship of environmental parameters with oleoresin yield in the diameter class of 30-40 cm. The study revealed that the oleoresin yield was significantly affected by environmental factors. The oleoresin yield was positively and highly significantly correlated with temperature (0.9465). The non-significant and positive correlation was found with relative humidity, sunshine hours/month and evaporation. The negative correlation had been observed between oleoresin yield and rainfall (-0.4927). The functional relationship between oleoresin yield with temperature, relative humidity, sunshine hrs/day and evaporation depicted a contribution of 99.23 per cent of variation.