Scholarly publications produced by the members of University of Ruhuna http://ir.lib.ruh.ac.lk/handle/iruor/8 2026-11-04T21:36:09Z 2026-11-04T21:36:09Z Kole, P. C. Chakraborty, N. R. Bhat, J. S. http://ir.lib.ruh.ac.lk/handle/iruor/22051 2026-11-04T10:34:16Z 2008-09-07T00:00:00Z

Analysis of variability, correlation and path coefficients in induced mu tants of aromatic non-basmati rice Kole, P. C.; Chakraborty, N. R.; Bhat, J. S. Variability, correlation and path coefficients for twelve morphological characters were studied on 18 morphologically distinct mutants in M4 generation along with their two mother genotypes (IET 14142 and IET 14143), which were developed from Tulaipanja, an aromatic non-basmati rice cultivar of West Bengal. Genotypic and phenotypic coefficients of variation were high for flag leaf angle and panicle number; moderate for grain number per panicle, straw weight, harvest index and grain yield per plant; and low for days to flower, plant height, panicle length, spikelet number, spikelet fertility (%) and test weight. High heritability accompanied by high to moderate genetic advance for flag leaf angle, panicle number, grain number, straw weight and grain yield indicated the predominance of additive gene ac tion for the expression of these characters. Grain yield was found to be positively and significantly cor related with plant height, panicle number per plant, straw weight and harvest index at both genotypic and phenotypic levels indicating the importance of these characters for yield improvement in this popu lation. The results of genotypic path analysis revealed that panicle number had the highest positive di rect effect followed by grain number, test weight, plant height, days to flower and straw weight. The overall results indicated that selection favouring higher panicle number per plant, test weight and straw weight and medium plant height with a reasonable balance for moderate grain number would help to achieve higher grain yield in this population of aromatic rice.

2008-09-07T00:00:00Z Pathmashini, L. Arulnandhy, V. Wijeratnam, R. S. W. http://ir.lib.ruh.ac.lk/handle/iruor/22050 2026-11-04T09:48:45Z 2008-08-30T00:00:00Z

Efficacy of different spawn types on sawdust media Pathmashini, L.; Arulnandhy, V.; Wijeratnam, R. S. W. An investigation was conducted to evaluate the efficacy of four different types of grain spawns viz; kurakkan (Eleusine coracana), maize (Zea mays), sorghum (Sorghum bicolor), and paddy (Oryza sativa) on oyster (Pleurotus ostreatus) mushroom production. Spawn types were based on their effects on mushroom solids (%), biological efficiency (BE %), size (g), number of sporophores, yield, yield ratio and substrate weight loss (%). Locally available kurakkan (Eleusine coracana), maize (broken) (Zea mays), sorghum (Sorghum bicolor), and paddy (Oryza sativa) were used for spawn production. The ex periment was designed as a complete randomized design with three replicates. Four types of spawns were tested on a medium based on sawdust. The growing media (substrate) inoculated with kurakkan spawns showed the highest biological efficiency of 27.82± 0.12 (%) , mean yield of 52.94 ± 0.67 g, mush room size of 7.73 ± 0.33 g and yield ratio of 23.19 ± 0.01. The harvests obtained from paddy spawn showed the highest mushroom solids of 9.97 ± 0.26 (g/100g of harvest). Highest mean numbers of sporophore (fruiting bodies) were noticed in the harvests obtained from sorghum spawn (7.67 ± 0.66). The kurakkan spawn significantly. Enhanced biological efficiency and increased size and yield, when com pared with other spawn types viz; maize (Zea mays), sorghum (Sorghum bicolor), and paddy (Oryza sativa).

2008-08-30T00:00:00Z Bandara, D. G. V. L. Thiruchelvam, S. http://ir.lib.ruh.ac.lk/handle/iruor/22049 2026-11-04T09:17:57Z 2008-08-29T00:00:00Z

Factors affecting the choice of soil conservation practices adopted by potato farmers in Nuwara Eliya district, Sri Lanka Bandara, D. G. V. L.; Thiruchelvam, S. Potato is an economically attractive crop, but it causes soil erosion in the hill country. Nuwara Eliya contributes about 27% of the national potato production and about 58% of the potato-cultivated land is prone to severe soil erosion. In spite of the seriousness of the soil erosion and the need for effective soil conservation practices, there is an absence of research on soil conservation practices and the level of adoption by potato cultivators. Therefore, the purpose of this research project was to find out the dif ferent soil conservation practices, level of adoption by potato farmers and influence of socio-economic factors on farmers’ decisions in the Nuwara Eliya district. Data were collected from a multistage strati fied random sample of 50 potato farmers in five Agrarian Service Centers (ASC) in the Nuwara Eliya district during 2007. Judgmental scaling method was used to assess the different levels of soil conserva tion methods adopted by the potato farmers. Multinomial Logit model was used to determine the choice of soil conservation practices. Likert - scaling method was used to assess the potato farmers’ perception on adopting appropriate soil conservation methods. Results reveal that 30, 52 and 18% of the potato cultivators were practicing good, average and poor level of soil conservation practices respectively. Good level of soil conservation practices has increased the farmers’potato yield and income. The cost of cultivation inversely affected the soil conservation practices adopted by potato cultivators. The prob ability of adopting good level of soil conservation was affected positively and significantly by education and land size. About 60% of the potato farmers have a positive attitude towards the importance of im proving soil conservation. Land ownership is a crucial factor for this. Appropriate training, extension and effective soil conservation subsidy are recommended to improve soil conservation for sustainable potato cultivation.

2008-08-29T00:00:00Z Okechukwu, R. U. Ekpo, E. J. A. http://ir.lib.ruh.ac.lk/handle/iruor/22048 2026-11-04T06:12:02Z 2008-08-31T00:00:00Z

Survival of xanthomonas campestris pv. Vignicola in infested soil, cowpea seed and cowpea debris Okechukwu, R. U.; Ekpo, E. J. A. Field and laboratory experiments were conducted in the Sudan savanna site of IITA’s experimental Station, Minjibir, Kano State, to study the survival of Xanthomonas campestris pv. vignicola in infested soil, cowpea seed, and debris. The experiment was conducted in a randomised complete block design with five cowpea varieties over three cropping seasons (from 1996 to 1998). The results showed that the bacterium survived in infected plant debris, seed, and soil but after 8 months off-cropping season, the bacterium was not recovered from the soil. This implies that seeds and plant debris are the major means by which X. campestris pv. vignicola survives through seasons.

2008-08-31T00:00:00Z