Influence of soil,plant and meteorological factors on water relations and yield inHevea brasiliensis |
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| Authors: | G Gururaja Rao P Sanjeeva Rao R Rajagopal A S Devakumar K R Vijayakumar M R Sethuraj |
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| Institution: | (1) Rubber Research Institute of India, Kottayam, 686 009 Kerala, India;(2) Present address: Regional Research Station, 3-Swaminarayana Society, Central Soil Salinity Research Institute, Anand, 388 001 Gujarat, India |
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| Abstract: | Influence of factors governing the soil-plantatmosphere system on components of water relations and yield was studied in two clones of rubber tree,Hevea brasiliensis, viz. RRII 105 and RRII 118. Clonal variations were evident in yield and yield components and associated physiological parameters in response to soil moisture status and meteorological factors. Observations made during different seasons indicatedvariations in yield are attributed to differences in plugging index and initial flow rates, to the major yield components and also variations in components of water relations as influenced by meteorological factors. Among the two clones, RRII 105 was found to be fairly drought tolerant compared to RRII 118. RRII 105 was found to respond well to dry weather through higher stomatal resistances, higher leaf water potentials, lowered transpirational water loss and lower relative transpiration ratios, while RRII 118 was susceptible to stress situations. |
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| Keywords: | Hevea brasiliensis Rubber Irradiance Vapour pressure deficit Water relations Yield Yield components |
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