5760 x 3840 px | 48,8 x 32,5 cm | 19,2 x 12,8 inches | 300dpi
Data acquisizione:
29 ottobre 2017
Altre informazioni:
Rubber is a coherent elastic solid obtained from latex of a number of tropical trees of which Hevea brasiliensis is the most important.Rubber is used for a variety of purposes from erasing pencil marks to manufacturing of tyres, tubes and a large number of industrial products. The first rubber plantations in India were set up in 1895 on the hill slopes of Kerala. However, rubber cultivation on a commercial scale was introduced in 1902.Rubber tree (Hevea brasiliensis) is a quick growing tall tree acquiring 20-30 metre height. It begins to yield latex in 5-7 years after planting. It requires hot and humid climate with temperature of 25°-35°C and annual rainfall of over 200 cm. The rainfall should be well distributed throughout the year. Dry spell and low temperatures are harmful. Daily rainfall followed by strong sun is very useful. Deep well drained loamy soils on the hill slopes at elevation ranging from 300 to 450 metres above sea level provide best conditions for its growth. The yields decline at higher elevations and no rubber plantations are found above 700 m elevation.Kerala is the largest producer of natural rubber producing 595 thousand tonnes or 92 per cent of total rubber production of India in 2002-03. Kottayam, Kollam, Ernakulam, Kozhikode districts produce practically all the rubber of this state.
