TY  - BOOK
AU  - Mondal G C
AU  - Chaudhuri D
AU  - Gohain T
AU  - Mondal D
AU  - Nair R B
AU  - Nazeer M A
AU  - Singh R P
TI  - Evaluation of yield potential of Hevea brasiliensis clones over ten years of tapping in Assam
PY  - 2007///
PB  - Natural Rubber Research
KW  - Assam
KW  - Clones
KW  - Growth
KW  - India
KW  - Yield
KW  - Yield stabilization
N1  - Source Year: 2007
N2  - The yield potential of 18 Hevea brasiliensis clones were evaluated over the first ten years of tapping under continuous tapping system (without rest) in Assam, North East India. Secondary attributes like TPD, clear bole volume, wind damage and tolerance to powdery mildew disease of these clones were also evaluated. RRIC 102 showed the highest girth in immature stage, closely follwed by RRIC 105, while the lowest girth was observed in Gl 1. RRIC 102 exhibited the highest girth increment after the commencement of tapping and during mature stage. RRIM 600 has the highest yield (33.91 g) over the first ten years of tapping followed by PB 311 (31.08 g). Yield was less for all the eighteen clones during winter months (December to March) characterised by low temperature, combined with wintering and refoliation stresses. High dry rubber content (DRC) of latex was observed in all the clones from May to August, while it was low in December and January. Yield got stabilized by six years of tapping. The projected commercial yield (kg/ha/year) over the first ten years of tapping indicated that RRIM 600 ranked first (2034 kg) followed by PB 311 (1864 kg). The potential yield of RRII 105, (the popular clone in the traditional tract) was only 1680 kg/ha/year in the experimental location
ER  -