Growth and Yield of Rubber Trees (Hevea brasiliensis Muell.Arg.) in Abandoned Paddy Field and Upper Land
DOI:
https://doi.org/10.14456/thaidoa-agres.2010.10Keywords:
abandoned paddy field, land use, soil property, rubber yield, Hevea brasiliensisAbstract
Rubber plantations in abandoned paddy fields have increased substantially both in number and area in the last few years in Phatthalung province. The objectives of this study were to investigate the growth and yield of rubber trees in abandoned paddy field in Khao Chaison sub-district, Khao Chaison district, Phatthalung province, during August 2007- July 2008. A field experiment was conducted to compare the growth and yield of rubber trees from two different rubber plantation areas where were located in the abandoned paddy field and upper land. RRIM 600 clone rubber plantations were subjected to 3 different age levels as 3, 6 and 16- year-old rubber trees. Seventy-eight replications (one tree per replication) were used in each location and analysed by t-test. Results were revealed that 16-year-old rubber tree showed significant decrease in leaf area index, trunk girth, adventitious root lengths (0-30 cm soil depth), leaf nutrients (P, K and Mg), reduced thiol content (R-SH), dry rubber content and fresh mass of wood in the abandoned paddy field. In addition, water table depth remained stable at a high level (25.14 cm below the soil surface) in the abandoned paddy field. It is recommended that growth and yield of rubber trees are markedly decreased in the abandoned paddy field.
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Thai Agricultural Research Journal