Rubber Science

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ISSN 2454-485X (Online)
ISSN 2454-4841 (Print)

Volume 17, Number 2, (December 2004) Articles 13 - 15

- RESPONSE OF RUBBER (HEVEA BRASILIENSIS) SEEDLINGS TO IRRIGATION IN NURSERYResearch Articles
- Pages 172 - 176
- Radha Lakshmanan, K.I. Punnoose & Thomson T. Edathil
- - Abstract
  - Keywords
  A study on the response of rubber seedlings to five moisture regimes (0, 25, 50, 75 per cent depletion of available soil moisture and un irrigated control) indicated 50 per cent depletion of available soil moisture to be the permissible level for optimum growth of seedlings. The growth attributes such as average leaf area, total aboveground biomass, length of the internode, number of leaves per whorl and whorl number were found to be significantly affected by moisture stress. Average seasonal and daily consumptive use and crop factor for the irrigation period were also worked out for the different moisture regimes.
  
  Consumptive use, Crop factor, Growth, Irrigation, Seedling nursery, Soil moisture depletion
- AVAILABLE NUTRIENT STATUS OF RUBBER GROWING SOILS IN THE LOWER BRAHMAPUTRA VALLEY OF ASSAMResearch Articles
- Pages 177 - 179
- Mrinal Choudhury, A.C. Sarma, T.K. Pal, S.K. Chakrabarty & S.K. Dey
- - Abstract
  - Keywords
  The status of nutrients in rubber (Hevea brasiliensis) growing soils of lower Brahmaputra valley of Assam was studied for understanding the soil fertility. The soils were acidic to strongly acidic in nature and majority of them were medium in organic carbon, low in available phosphorus and medium in potassium. Wide variation in fertility ratings indicates that these soils require specific management measures to maintain fertility depending on the age of the rubber plantation.
  
  Assam, Hevea brasiliensis, North East India, Nutrient status
- PATH ANALYSIS OF YIELD AND MAJOR YIELD COMPONENTS OF HEVEA BRASILIENSIS CLONE RRIM 600 UNDER ENVIRONMENTAL CONDITIONS OF TRIPURAResearch Articles
- Pages 180 - 186
- S.K. Dey, G. Das, Badre Alam & A.C. Sarma
- - Abstract
  - Keywords
  The effect of environment, nutrition and tapping systems on yield and yield components of the clone RRIM 600 was studied during peak yielding months at Agartala, India. Path analysis performed to understand the cause-effect relationship of different yield components revealed the influence of weather parameters. The temperature is the most important climatic parameter directly affecting the flow rate, dry rubber content and plugging of the latex vessels. Wind speed and pan evaporation also affected the rubber content in the latex and plugging of vessels. Other parameters like length of tapping cut, systems of tapping and tapping panel have significant influence on yield. Application of chemical stimulant (2.5% ethepon) also increased yield during low yielding period. Yield also increased with increase in nitrogen dose up to 30 kg/ha. The effects of all these factors on yield either by contributing towards DRC or by affecting the flow rate which ultimately causes early plugging and low yield are discussed.
  
  Hevea, Nitrogen, Non-traditional area, Path analysis, Tapping panels, Yield components

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Volume 17, Number 2, (December 2004) Articles 13 - 15