Comparison of yields between budgrafts and mother trees in <I>Hevea brasiliensis</I> Muell. Arg.

Abstract

Data available from three experiments conducted during 1939 and 1953 on the dry rubber yield of mother tree genotypes and clones derived from them by bud grafting were analyzed. These experiments comprised of 64 mother genotypes belonging to 23 families. Three to five bud grafted trees have been derived from each of these mother trees within one year and the age difference between the mother trees and clones were about one year. In all three experiments the dry rubber yields in budgrafts from the high yielding mother trees have reduced. The reduction was highest and significant in budgrafts derived from the highest yielding mother trees. On the other hand the yields of the budgrafts from the low yielding mother trees have increased significantly. The percentage deviation of clone yield with respect to the yields of mother trees shows a regular variation in all the three experiments that could not be expected solely due to the stock/scion interaction. But it is most probably a combined effect resulting from the branch characteristics inherited to the budgraft and the stock/scion interactions. This is an indication that the high yields of mother trees are not transferred to the clones through budgrafting and is an important phenomenon that needs further studies.

Smallholder rubber agroforestry farming in the non-traditional areas of Sri Lanka: An application of assets-based livelihood capital indicator approach

“…Farmers in the traditional rubber growing areas are cultivating several food crops including tea, bana na, cinnamon, pepper, and pineapple wit h rubber. It is reported that increasing the input efficiency of food crops is vital to minimize competition for resources with rubber and the application of proper agronomic practices is most vital in ensuring the input efficiency of food crops [3]. Adding food crops cultivation to the rubber lands gives more benefits, except for crop yield such as increasing nitrogen availability in soil, reducing soil erosion, and plant support to control crop pests [4,5].…”

Interaksi Genotipe x Lingkungan dan Stabilitas Hasil Biji Kedelai Toleran Naungan

“…Kendala yang utama adalah rendahnya intensitas cahaya akibat naungan. Menurut Pathiratna (2006) dan Wibawa et al (2006), intensitas cahaya pada dua tahun pertama penanaman tanaman karet mencapai hampir 100%, namun mengalami penurunan pada tahun ke tiga bersamaan dengan pertumbuhan kanopi tanaman karet.…”