Browsing by Author "Jayasekera, C."
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Item Effect of storage temperature and wrapping treatments on the keeping quality of tender king coconut(Coconut Research Institute. Lunuwila, 1998/1999) Ranasinghe, C.S.; Wimalasekera, R.; Jayasekera, C.King coconut (Cocos nucifera var.aurantiaca) has a good export market as a natural beverage. Howerver the quality of the nut has to be maintained for several weeks to meet export market requirements. Therefore, the present study was undertaken to develop techniques to imporve the keeping quality of tender king coconuts. Seven -month -old nuts collected from different locations were given wrapping and waxing treatments and stored at low temperature to improve the keeping quality up to four weeks. Invert sugars and total sugars were analyzed. Observations on cosmetic appearance and organoleptic tests were made at initial stage and after storage. The study revealed that the quality of tender kind coconuts could be maintained for a period of four weeks when the whole nuts were wrapped with cling film and stored at 14-15C in order to meet export market requirements.Item Photosynthesis and assimilate partitioning characteristics of the coconut palm as observed by C labeling(University of Ruhuna Faculty of Agriculture. Kamburupitiya, 2000) Jayasekera, C.; Jayasekera, K.S.; Bowen, G.D.Item Photosynthetic characteristics and productivity of the coconut palm(Coconut Research Institute. Lunuwila, 1996) Jayasekera, C.; Nainayake, N.P.A.D.; Jayasekera, K.S.Among the tree crops in the tropics the coconut palm occupies an important position as a food, oil, and fibre crop. Productivity of crop species depends on the combined effect of their genetic constituion, climate, nutrition and other biotic factors. To increase the productivityof coconut palm it is necessary to have a basic understanding of physiological processes such as assimilation of carbon and growth in relation to climatic factors. In-situ photosynthetic measurement of coconut seedlings using Li-COR 6500 portable photosynthesis system revealed that their maximum photosynthetic capacity is attained at photosynthetic photon flux densities (PPED) ranging from 1400-1700 moles photons m-2 s-1. The rate of apparent photosynthesis (A) of the coconut palm varies between 2-15 m mol CO2 m-2S-1 depending on leaf age, nutritional status and climatic factors. The rate of leaf respiration was closely similar in young and older leaves ranging from - 2 to 1 m mol CO2m-2S-1. The measured light-use efficiency of the coconut palm was found to be 1.2 g MJ-1 and the conversion efficiency of solar energy was approximately 2.4 per cent. Water deficit is the major constraint causing wide fluctuations in photosynthesis. due to height of trees, the leaves in the canopy are exposed to high wind velocity as well as water and thermal stressess. As a result, under soil water defict conditions coconut palm reduce excessive water loss and gaseous echange by mid-day closure of stomata and maintain stomatal conductance at a lower level. However, the rate of apparent photosynthesis and the ratio of intercellular to ambient partial pressure of CO2 (Pi/Pa) are not decreased proportionately with the stomatal conductance.Item Report of the Division of Botany and Plant Breeing - 1979(Coconut Research Institute:Lunuwila, 1980) Jayasekera, C.Item Some notes on the coconut root system(Coconut Research Institute. Lunuwila, 1990) Jayasekera, C.Item Studies on development and storage of bottled penipol(CRI. Lunuwila, 2003) Gunathilake, K.D.P.P.; Jayasekera, C.