4.Journals Published in Sri Lanka
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Item Aspects of the shade tree question(Tea Research Institute:Talawakele, 1985) Kathiravetpillai, A.Item Juvenile growth of Benguet pine (Pinus kesiya Royle ex Gordon) seedlings planted under Alnus stands(Forest Department:Colombo, 1980) Penafibl, S.R.; Nobbe, B.F.; Gales, L.N.Item Fertilizer nitrogen effects on nitrogen fixation and utilization in lentils and soybeans(Soil Science Society of Sri Lanka:Peradeniya, 1989) Sangakkara, U.R.Item Effect of associative nitrogen fixing and phosphate solubilising bioagents on growth, yield and quality of sugarcane(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2000) Shankaraiah, C.; Hunsigi, G.Item Biofertilizers and their application(Eastern University. Chenkalady, 1999) Bagyaraj, D.J.; Suvarna, C.V.Item Scope of enhancing nodulation of groundnut through soil amendments by crop residues of wide C:N ratios(Eastern University. Chenkalady, 1999) Thedchanamoorthy, K.; GurungItem Efficient management of soil and biologically fixed nitrogen in intensively-cultivated rice fields(Eastern University. Chenkalady, 1999) Kundu, D.K.; Ladha, J.K.Item Using more nitrogen from the air for plant growth(Rubber Research Institute of Sri Lanka. Agalawatta, 1985) Jayasinghe, C.K.Item Effect of incubation time on acetylene reduction activity of common cover crops of Sri Lankan rubber plantation(Rubber Research Institute. Agalawatta, 1989) Jayasinghe, C.K.; Parker, C.A.; Kulasooriya, S.A.A wide range of incubation time from a few minutes to severl hours have been used with defferent plant systems in investigations on acetylene reduction assays. However, the duration of incubation period is of utmost importance in obtaining nitrogen fixation estimates using this technology. Time course experiment showed that acwtylene reduction by nodules of P. phaseoloides and D. ovalifolium started without a lag but rate of the nitrogenasse activity was reduced 4 hours after incubation while M. invisa showed a considerable activity even at the 8th hour of incubation. In the second experiment which was conducted to observe the relationship between acetylene reduction activity and incubation time upto one our, there was a linear relationship for both P. phaseoloides (r = +0.9832) and D. ovalifolium (r = + 0.99961)Item Diurnal variation in nitrogenase activity of common cover crops in rubber plantations of Sri Lanka(Rubber Research Institute. Agalawatta, 1989) Jayasinghe, C.K.; Parker, C.A.; Kulasooriya, S.A.Diurnal fluctuations in nitrogenase activity (acetylene reducing activity) have been observed in several nitrogen fixing systems. All experimental plants viz. P. phasides D. ovalifolium and M. invisa demonstrated diuanal rhythm withlight intensity. The lowest acetylene reduction activiteswere detected around midnight and they were activelyu fixing nitrogen by 8.00 am. M. invisa responded to high soil temperature in addition to light intensity. A marked drop in acetylene reduction activity was observed by about 4.00pm when the soil temperature was around 38ºC
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