Possibilities for intercropping cinnamon (Cinnamomum verum J.Pres) under rubber (Hevea brasiliensis Muell. Arg.) were investigated. In one experiment, the 9.1 m inter row space of a 15 year old rubber plantation was intercropped with cinnamon. The effect of four cinnamon densities (17,500 bushes ha )1 , 8,260 bushes ha )1 , 7,980 bushes ha )1 and 3,980 bushes ha )1 ) and four levels of fertilizer (60 g bush )1 , 120 g bush )1 , 180 g bush )1 and 240 g bush )1 ) on cinnamon bark yield and yield components were tested in a split plot experiment. Interception of light by the rubber canopy, R:FR ratio of transmitted light under the rubber canopy and the fine root length density in the inter row was uniform in all treatments throughout the whole experimental period. R:FR ratio of light under cinnamon was significantly lower under the highest cinnamon plant density of 17,500 bushes ha )1 . Bushes in the highest plant density treatment (D1) produced longer shoots than those in the lowest density treatment (D4), where the weight of bark cm )1 was greater. As a result there were no significant effects of plant density on cinnamon bark yield at the individual bush level. This also resulted in significantly greater weight of bark per ha in the highest density treatment (D1) indicating the possibility of increasing cinnamon plant density for obtaining greater bark yield from intercropping systems under considerable shade and root competition. Increasing the level of added fertilizer even up to four times the standard did not have any advantage on bark yield or its components.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.