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Faculty of Agriculture: Recent submissions

Now showing items 161-180 of 404

Effects of Intermixed Water Repellent Materials on Hydrophysical Characteristics in Potting Media.

Wasana, P.G.U.N.; Samarawickrama, U.I.; Leelamanie, D.A.L. (Farabi Publishing House, Istanbul, Turkey, 2021-08-16)

Potting media act as a facilitator to provide nutrients, physical support, and moisture to plants. With the increasing trend of potted plant industry, problems related to potting media such as water losses, rapid ...
Oil palm expansion on the health of its associated vegetation; A case study in Nagoda administrative division using GIS and remote sensing

Samarawickrama, U.I.; Leelamanie, D.A.L.; Wijekoon, W.M.C.J.; Jayasinghe, P.K.S.C. (Osmaniye Korkut Ata University, 2022-06-30)

Oil palm (Elaeis guineensis) cultivation in Sri Lanka began several decades ago in the Galle district. Oil palm cultivation expanded to the other regions of the Low country wet zone to reach the national edible oil ...
Genotypic differences in cardinal temperatures for in vitro pollen germination and pollen tube growth of Coconut

Ranasinghe, C.S.; Kumarathunghe, M.D.P.; Kiriwandeniya, K.G.S. (Cambridge University Press, 2017-07-25)

Successful fruit set in coconut depends on several reproductive processes including pollen germination and pollen tube growth. High temperature (˃33 °C) during ﬂowering reduces fruit set in coconut. Therefore, identiﬁcation ...
Variation in yield and yield components of different coconut cultivars in response to within year rainfall and temperature variation

Samarasinghe, C.; Meegahakumbura, M.; Perera, L.; Kumarathunge, D.; Dissanayaka, H. (Elsevier, 2018-08-19)

The yield (no. of nuts/palm/year) of coconut (Cocos nucifera L.) is highly inﬂuenced by the amount and distribution of rainfall and year-round temperature. Thisstudy was conducted to evaluate the variation in yield and ...
Development of a Thermal Risk Map Case Study: Kelaniya City of Sri Lanka.

Samarawickrama, U.I.; Ranagalage, Manjula; Piyaratne, M.K.D.K. (Asian Association on Remote Sensing, Taiwan, 2016-09-12)

The land surface temperature in city areas is increased compared to the adjacent rural areas as a result of industrialization and urbanization. This phenomenon is known as the formation of heat island. In the context of ...
Trees tolerate an extreme heatwave via sustained transpirational cooling and increased leaf thermal tolerance

Drake, J.E.; Tjoelker, M.G.; Vårhammar, A.; Medlyn, B.; Reich, P.B.; Leigh, A.; Pfautsch, S.; Blackman, C.J.; Aspinwall, M.J.; Crous, K.Y.; Duursma, R.A.; Kumarathunge, D.; De Kauwe, M.G.; Jiang, M.; Nicotra, A.B.; Tissue, D.T.; Choat, B.; Atkin, O.K.; Barton, C.V.M. (John Wiley & Sons, Inc., 2018-01-07)

Heatwaves are likely to increase in frequency and intensity with climate change, which may impair tree function and forest C uptake. However, we have little information regarding the impact of extreme heatwaves on the ...
Use of unobserved components model for forecasting non-stationary time series: a case of annual national coconut production in Sri Lanka

Brintha, N.K.K.; Samita, S.; Abeynayake, N.R.; Idirisinghe, I.M.S.K.; Kumarathunga, M.D.P. (Postgraduate Institute of Agriculture, Sri Lanka, 2014)

Forecasting a time series is generally done by using autoregressive integrated moving average (ARIMA) models. The main drawback of this technique is that the time series should be stationary. In reality, this assumption ...
Response of Crops to Heat Stress in a Warming World: Adaptation Measures under Sri Lankan Context.

Weerasinghe, K.W.L.K.; Nalaka, G.D.A.; Kumarathunge, D.P. (The Institute of Biology Sri Lanka., 2020-09-25)

Rising temperatures impose heat stress for a wide variety of crops, negatively influencing their growth and development leading to yield losses. Each crop species has its own thermal thresholds at different growth stages ...
Photosynthetic irradiance response, canopy photosynthesis and their variation with canopy strata in tall and dwarf×tall coconut cultivars (Cocos nucifera L.)

Ranasinghe, C.; Kumarathunge, M.D.P.; Costa, W.; Jayaranjini, S. (Elsevier, 2015-06-25)

Estimation of the carbon balance coconut (Cocos nucifera L.) requires characterization of its photosynthetic irradiance response. Accordingly, the objectives of this work were to determine an appropriate photosynthetic ...
The estimation of daily mean soil temperature at different depths in three Agroecological regions of Sri Lanka

Kumarathunge, M.D.P.; Waidyarathne, K.P.; Samita, S. (Coconut Research Institute of Sri Lanka, 2012-12-15)

Soil temperature is an important climatic variable in regulating ecosystem process, yet it is difficult and costly to measure daily. Several mathematical models are available to estimate soil temperature; however, most are ...
Limitation in the use of spectral analysis to detect Weligama coconut leaf wilt disease affected palms in Southern Sri Lanka

Nainanayake, A.D.; Gunathilake, J.; Kumarathunga, M.D.P.; Gunawardena, P.M.; Wijesekara, H.T.R. (Coconut Research Institute of Sri Lanka, 2016-11-03)

Weligama Coconut Leaf Wilt Disease (WCLWD) was first reported in late 2006 in the Weligama Divisional Secretariat Division (DSD) in Matara District in the Southern Province of Sri Lanka. Surveys conducted in 2012 revealed ...
A survey of land for Weligama coconut leaf wilt disease affected palms outside the declared boundary in the Southern Province.

Nainanayake, A.D.; Kumarathunga, M.D.P.; De Silva, P.H.P.R. (Coconut Research Institute of Sri Lanka, 2016-11-02)

After the identification ofthe Weligama Coconut LeafWilt Disease (WCLWD) in 2006, a three km wide boundary zone was declared which stretched from Galle to Tangalle. All suspicious palms recorded within the boundary zone ...
Cultivar by environment interaction of coconut under different water and heat regimes at their early stage of growth

Perera, L.; Samarasinghe, C.R.K.; Kumarathunge, D.P.; Dissanayaka, H.D.M.A.C.; Meegahakumbura, M.K. (Pakistan Botanical Society, 2017-04-25)

Four coconut hybrids (brown dwarf x Sri Lanka tall, Sri Lanka tall x brown dwarf, green dwarf x San Ramon and green dwarf x Sri Lanka tall) arising with two parental dwarf coconut varieties; green dwarf and brown dwarf ...
GROWTH PERFORMANCE OF SANDALWOOD DURING NURSERY STAGE AS AFFECTED BY DIFFERENT HOST PLANTS

Drake, J.E.; Vårhammar, A.; Kumarathunge, D.; Medlyn, B.E.; Pfautsch, S.; Reich, P.B.; Tissue, D.T.; Ghannoum, O.; Tjoelker, M.G. (John Wiley & Sons, Inc., 2017-05-23)

Impacts of climate warming depend on the degree to which plants are constrained by adaptation to their climate-of-origin or exhibit broad climatic suitability. We grew cool-origin, central and warm-origin provenances of ...
Genotypic selection approach made successful advancement in developing drought tolerance in perennial tree crop coconut

Samarasinghe, C.; Meegahakumbura, M.; Kumarathunge, D.; Dissanayaka, H.; Weerasinghe, P.; Perera, L. (Elsevier, 2021-09-04)

Coconut (Cocos nucifera L.) is a major plantation crop in humid tropics that affects the socio-economic life of several developing countries. Being a rainfed crop, coconut is highly prone to drought and breeding for drought ...
Triose phosphate utilization limitation: an unnecessary complexity in terrestrial biosphere model representation of photosynthesis

Rogers, A.; Kumarathunge, D.P.; Lombardozzi, D.L.; Medlyn, B.E.; Serbin, S.P.; Walker, A.P. (John Wiley & Sons, Inc., 2020-11-20)

Triose phosphates are the principal product of photosynthesis. They are used within the chloroplast for starch synthesis, or translocated to the cytosol where they are used to fuel sucrose synthesis. Use of triose phosphate ...
EVALUATION OF THE PLOTLESS SAMPLING METHOD TO ESTIMATE ABOVEGROUND BIOMASS AND OTHER STAND PARAMETERS IN TROPICAL RAIN FORESTS

Kumarathunge, D.; Thatti, R.O.; Nissanka, S.P. (ALÖKI Applied Ecological Research and Forensic Institute Ltd., Budapest, 2011-08-26)

Use of sampling techniques is of paramount importance since the precision of estimates greatly depend on it. Different methods of sampling have to be investigated to find out the best sampling technique for a given situation. ...
Acclimation and adaptation components of the temperature dependence of plant photosynthesis at the global scale

Kumarathunge, D.P.; Medlyn, B.E.; Drake, J.E.; Tjoelker, M.G.; Aspinwall, M.J.; Battaglia, M.; Cano, F.J.; Carter, K.R.; Cavaleri, M.A.; Cernusak, L.A.; Chambers, J.Q.; De Kauwe, M.G.; Dillaway, D.N.; Dreyer, E.; Ellsworth, D.S.; Ghannoum, O.; Han, Q.; Hikosaka, K.; Way, D.A. (John Wiley & Sons, Inc., 2018-12-29)

The temperature response of photosynthesis is one of the key factors determining predicted responses to warming in global vegetation models (GVMs). The response may vary geographically, owing to genetic adaptation to ...
No evidence for triose phosphate limitation of light‐saturated leaf photosynthesis under current atmospheric CO2 concentration

Kumarathunge, D.P.; Medlyn, B.E.; Drake, J.E.; Rogers, A.; Tjoelker, M.G. (John Wiley & Sons, Inc., 2019-08-04)

The triose phosphate utilization (TPU) rate has been identified as one of the processes that can limit terrestrial plant photosynthesis. However, we lack a robust quantitative assessment of TPU limitation of photosynthesis ...
The temperature optima for tree seedling photosynthesis and growth depend on water inputs

Kumarathunge, D.P.; Drake, J.E.; Tjoelker, M.G.; López, R.; Pfautsch, S.; Vårhammar, A.; Medlyn, B.E. (John Wiley & Sons, Inc., 2019-12-28)

Understanding how tree growth is affected by rising temperature is a key to predicting the fate of forests in future warmer climates. Increasing temperature has direct effects on plant physiology, but there are also ...

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