Dear Sir
U first do soil testing, then if these conditions are favourable the humidity can be modified.
Optimum temperatures that rubbers required are between 25° C and 35° C.
Soil reaction on the pH 4,5 - pH 6,5
Land slope <16%
Soil water surface <100 cm.
The elevation higher than 600 m from sea level not suitable to rubber to grow.
U can get some ideas from the below
CHENNAI RUBBER PRODUCTS
NO.49/3, Arcot Road
Valasaravakkam,Chennai - 87
Ph: 91+ 44 + 24862126,24861716
Email:
Chennairubberproducts@rediffmail.com
Regards
Kirti