Growth pattern of rubber trees (Hevea brasiliensis) in a tropical humid climate in India

Sailajadevi T., . and Varghese Y. A., . and Saraswathyamma C. K., . and Chandrashekar T. R., . and Alice J., . and Vijayakumar K. R., . Growth pattern of rubber trees (Hevea brasiliensis) in a tropical humid climate in India. pp. 191-198. ISSN 1511-1768

A study to understand the monthly pattern of growth and its duration in rubber trees Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell. Arg. was conducted in the traditional rubber-growing zone of India. The climate of the zone is tropical humid type with a dry period of about four months from December to March and good pre-monsoon showers during March/April. Data were collected on girth growth of trees belonging to 13 clones from an ongoing clone-evaluation trial. Monthly increases in girth collected for a period of three years from 1992 to 1994 were used to study the growth response of the trees to the ambient environmental conditions. Growth occured in the stress-free period only. Plants started growing from May and continued up to November. Growth increased sharply in the initial monsoon months of May-June peaked in July-August and declined gradually from September reaching negligible levels from December to April. In March 1994 a significant number of trees belonging to most of the clones showed a reduction in girth ranging from 0.2 cm to 0.5 cm. From the unweighted pair group-average clustering pattern method using Euclidian distances two clusters of homogenous growth trajectories were identified. The growth curves indicated that in the traditional rubber-growing zone in India Hevea had a peak growth period of two months from July to August and an active growth period of about seven months from May to November.

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Abstract

A study to understand the monthly pattern of growth and its duration in rubber trees Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell. Arg. was conducted in the traditional rubber-growing zone of India. The climate of the zone is tropical humid type with a dry period of about four months from December to March and good pre-monsoon showers during March/April. Data were collected on girth growth of trees belonging to 13 clones from an ongoing clone-evaluation trial. Monthly increases in girth collected for a period of three years from 1992 to 1994 were used to study the growth response of the trees to the ambient environmental conditions. Growth occured in the stress-free period only. Plants started growing from May and continued up to November. Growth increased sharply in the initial monsoon months of May-June peaked in July-August and declined gradually from September reaching negligible levels from December to April. In March 1994 a significant number of trees belonging to most of the clones showed a reduction in girth ranging from 0.2 cm to 0.5 cm. From the unweighted pair group-average clustering pattern method using Euclidian distances two clusters of homogenous growth trajectories were identified. The growth curves indicated that in the traditional rubber-growing zone in India Hevea had a peak growth period of two months from July to August and an active growth period of about seven months from May to November.

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Item Type:	Article
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Humid climate
AGROVOC Term:	Rubber crops
AGROVOC Term:	Growth rate
AGROVOC Term:	Humid climate zones
AGROVOC Term:	Oxisols
AGROVOC Term:	Wilting point
AGROVOC Term:	Crop management
AGROVOC Term:	Weather conditions
AGROVOC Term:	Drought resistance
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23178

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