http://ir.lib.ruh.ac.lk/handle/iruor/21787 2026-10-24T04:16:43Z http://ir.lib.ruh.ac.lk/handle/iruor/21985 Comparison of selected extractants for the estimation of available K in soils of edo state of central southern Nigeria Osemwota, I.O. Comparison of five selected extractants for estimation of available K in soils of Edo State of Central Southern Nigeria was carried out in a greenhouse with maize as the test crop. The five extractants used were distilled water, 0.5 N NaHCO3 (pH 8.5), 0.01 M CaCl2, 0.1 N HNO3 and 1 N NH4OAc (pH 7). Nine composite surface (0 – 15 cm depth) and subsurface (15– 30 cm depth) soil samples were used in this study. The amount of extractable K by 1 N NH4OAc (pH 7) and 0.1 N HNO3 showed the highest significant linear correlation with K uptake and dry matter yield with ‘r’ values of 0.910***, 0.895*** and 0.718***, 0.754*** (P = 0.001) respectively, when compared with distilled water, 0.5 N NaHCO3 (pH 8.5) and 0.01 M CaCl2. The use of 1 N NH4OAc (pH 7) and 0.1N HNO3 soil tests could be recommended because they appeared to have almost equal efficiency in terms of the ability of extracting available K from these soils. 2007-01-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/21984 Effect of mycorrhizal inoculation at different salinity levels on root coloniza tion, growth and chlorophyll content of different grape rootstocks (vitis spp) Derbew, B.Y.; Mokashi, A.N.; Patil, C.P.; Hegde, R.V. A pot culture experiment was conducted during 2004-2006 at the College of Agriculture, Uni versity of Agricultural Sciences, Dharwad, to investigate effect of arbuscular mycorrhizal (AM) fungus (Glomus fasciculatum) inoculation at different salinity levels (0.52, 1.90, 4.33, 6.23 and 7.94 dSm-1) on root colonization, growth and chlorophyll content of four grape rootstocks (Salt Creek, Dogridge, St. George and 1613). The extent of AM response on root colonization, growth and chlorophyll content varied with rootstock species, and with the level of salinity. AM fungus inoculated plants showed significantly higher root colonization percentage, root volume, root length, number of leaves, leaf area, total dry weight, and chlorophyll content. Ex posure to salinity stress resulted in decreased root colonization, chlorophyll content and growth of shoots on all rootstocks, but reduction in growth was greatest on St. George. 2007-01-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/21983 Efficacy of some synthetic and biopesticides against pod borer, helicoverpa armigera (hubner) in chickpea Hossain, Altaf Efficacy of some synthetic and biopesticides against pod borer, Helicoverpa armigera (Hubner) damage in chickpea was studied at the Regional Agricultural Research Station, Ishurdi, Pabna, Bangladesh during rabi cropping season of 2004-05. Synthetic and biopesticides reduced pod borer damage significantly. Significantly lowest pod damage was observed in cypermethrin (5.75%) and HNPV (5.86%) sprayed plots followed by carbaryl (6.05%) and dimethoate (7.92%) treated plots. The bio-control agent, HNPV, showed equally the best performance like synthetic insecticides and also showed higher efficacy than neem based insecticides like nimbi cidine (azadiractin 0.03% EC). Pod damage reduction by synthetic insecticides and bio pesticides over untreated control ranged from 24.98 to 64.08%. It ranged from 50.53 to 64.08% in synthetic insecticides and 24.98 to 63.40% in bio-pesticides. Significantly the highest yield (1,856 kg/ha) obtained from HNPV sprayed plots which was statistically identical to cyperme thrin followed by azadiractin 0.03% EC. The highest net income ($ 105/ha) and marginal bene fit cost ratio (3.35) was recorded from HNPV spray followed by cypermethrin ($ 87/ha) and (2.12), respectively. Hence, it might be concluded that HNPV is the best tool in managing pod borer in chickpea considering efficacy, profitability and environment friendly. 2007-01-01T00:00:00Z http://ir.lib.ruh.ac.lk/handle/iruor/21978 Exploring possibility of using davulkurundu (neolitsea involurate) leaf extract to improve leavening action and crumb structure of wheat bread Navaratne, S.B. A preliminary study revealed that Davulkurudu (Neolitsea involurate) leaf (DKL) extract is the best jelly source as against Ladies finger and Dorian seed extracts to manufacture high quality bread due to its heat instability nature. Five kg of wheat flour was incorporated with necessary ingredients and divided into two portions. One portion was mixed with water and the rest with DKL extract. Prepared doughs were allowed to ferment and the time taken to reach leavening index 2.0, an indicator to have a soft breadcrumb, were recorded. Leavening time, bulk den sity, pH value, organoleptic properties and stalling effect in terms of elasticity were evaluated. Results revealed that DKL extract incorporated bread dough had half an hour less leavening time and low bulk density (0.09) of bread than the normal bread (0.12) due to well develop bread crumb. However, DKL extract did not affect the pH value of bread. Organoleptic prop erties, texture, crumb cell distribution and over all acceptability of bread prepared with DKL were significantly better than the counter treatment except mouth feel, color and aroma. DKL extract was also capable of retarding stalling process by 6-8 h. 2007-01-01T00:00:00Z