Abstract:
Volumetric moisture content data obtained from 12 positions in relation to planting points over a period of
12 months indicate that the distances varying from 0-120 cm from the trunk of young rubber tree are
suitable for assessing the water content of the soil profile. Feeder root density was significantly different at
different depths with the highest percentage of roots being in the surface soil layers, 0-10cm and 10-20cm, in
the region of 120 cm circle, These findings were further confirmed by the co-efficient of variation of
volumetric moisture content data obtained at different depths in relation to planting points. Therefore, it is
evident that a clear relationship exists between the rooting density of rubber and the moisture readings.
Based on the soil moisture data under different management practices, it is possible to overcome the adverse
effects of soil moisture deficit by growing appropriate rubber clones, with the use of mulch preferably
paddy straw and higher levels of potassium, during the immature period of rubber plants.
