4.Journals Published in Sri Lanka
Permanent URI for this communityhttps://dl.nsf.gov.lk/handle/1/6840
Browse
16 results
Search Results
Item Rank based selection indices for clonal evaluation of sugarcane (Saccharum spp.)(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1997) Wijesuriya, A.; Thattil, R.O.; Perera, A.L.T.Item Fertilizer response functions and optimum levels for bean cultivation in Badulla district(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1999) Sivachandiran, S.; Thattil, R.O.; Samita, S.Item Use of covariates in improving precision of field experiments in rubber(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1996) Wijesuriya, B.W.; Thattil, R.O.Item A method for handling overdispersion in binary data:illustrated by analysis of survey data on pineapple wilt disease(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1996) Samitha, S.; Thattil, R.O.Item An effective sampling procedure to estimate annual yield of rubber(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1995) Wijesuriya, B.W.; Thattil, R.O.Item Effect of some controllable parameters on optimization of characteristics in CTC type teas(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1994) Ranaweera, A.S.; Thattil, R.O.; Basnayake, B.F.A.Item Analysis of growth and indirect selection for environmental sensitivity in Nicotiana rustica(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1993) Thalib, A.T.L.; Kearsey, M.J.; Pooni, H.S.P.; Thattil, R.O.Item Factors associated with the adoption of the six row rice transplanter machine(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1991) Niranjan, S.K.D.F.F.; Jayatilake, M.W.A.P.; Thattil, R.O.Item Selection criteria used in clonal evaluation of sugarcane (Saccharum spp.)(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 1993) Wijesuriya, A.; Thattil, R.O.; Perera, A.L.T.Item Control of variability in experiments with rubber using covariance technique. a review(Rubber Research Institute. Agalawatta, 1997) Wijesuriya, B.W.; Thattil, R.O.Comparatively little has been published on experimental techniques and statistical methods in rubber.This paper is a review of available literature on the use of covariates in experiments falling into immature and mature stages of rubber.The main objective is to encourage researchers to collect appropriate pre-treatment records to adjust the post.treatment variables so as to obtain high precision of results.In this connection,the effectiveness of rubber yield,girth and panel variables as pre-treatment records during the mature stages;seed and budded stump weights as covariates during the immature stages are discussed.The use of double covariance and other possible approaches to minimize initial variability in fertilizer,pest and disease,weed and green house experiments are also discussed.