Abstract
Existing plant types of rubber tree after planting and available tapping tree were investigated, and there were about 28 rubber plantations with different tapping years of 8 varieties “CATAS7-33-97”, “CATAS8-79”, “CATAS7-20-59”, “PR107”, “RRIM600”, “GT1”, “INA873”, “93-114”in South China. The results showed that there were six kinds of existing plant types of rubber tree after planting of rubber plantations, which were available tapping trees, wind damaged trees, cold damaged trees, tapping panel dryness trees, absent trees and weak trees, respectively. These data investigated also showed rubber trees under available tapping, stoppage due to tapping panel dryness, absence, wind damage, cold damage and weakness were counted and calculated and made up for 72.21%, 14.75%, 5.61%, 3.86%, 2.68% and 1.89%. Tapping panel dryness trees, wind damage and absent trees are major factors for the loss of tapping rubber trees in the rubber plantations. Of these investigated varieties, available tapping trees per 100 trees of rubber plantation of “PR107”at the 1st, 12th, 14th, 16th, 20th, 24th tapping year were 96, 67, 70, 75, 66, 46 trees in Hainan planting zone, respectively. Available tapping trees per 100 trees of rubber plantation of “RRIM600”at the 9th, 15th, 20th, 22nd tapping year were 88, 62, 55, 36 trees in Yunnan planting zone, respectively. Available tapping trees per 100 trees of rubber plantation of “93-114” at the 10th, 19th, tapping year were 94, 62 trees in Guangdong planting zone. These results showed that available tapping trees of rubber plantation decreased with increasing tapping age under different planting zones in China.
Highlights
IntroductionThrough grasping the situation of how many available tapping trees are in the rubber land, the enterprisers and growers can estimate the production capability
It is a decisive yield factor to the available tapping trees in the specific rubber land on dry rubber production.Through grasping the situation of how many available tapping trees are in the rubber land, the enterprisers and growers can estimate the production capability
There is still a lack of objective and comprehensive understanding of the problem of low dry rubber yield for rubber plantations in China. It will help solve the problem through analysis of existing plant types of rubber tree after planting and available tapping tree of rubber plantations
Summary
Through grasping the situation of how many available tapping trees are in the rubber land, the enterprisers and growers can estimate the production capability They can make the yield plan each year and the trees renewal in time. Some researchers analyzed that severe cold injury was the main reason for low number of mature trees, and that improving number of mature trees in rubber plantation helps to achieve sustainable development of the rubber plantations [6] Some factors such as plant density of rubber plantation [7], human behavior and its decisionmaking errors [8], strong typhoon [9] affected the growth of the rubber trees in South China. It will help solve the problem through analysis of existing plant types of rubber tree after planting and available tapping tree of rubber plantations. This paper preliminarily studied existing plant types of rubber tree after planting and available tapping tree for rubber plantations in Hainan, Yunnan and Guangdong rubber planting zone
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