Showing papers by "Jayanta Kumar Datta published in 2009"

Antifungal activities and chemical characterization of neem leaf extracts on the growth of some selected fungal species in vitro culture medium.

Abstract: The efficacy of different extracts of neem leaf on seed borne fungi Aspergillus , Rhizopus and chemical characterization of the neem leaf extracts were studied in vitro on the culture medium. The growth of both the fungal species was inhibited significantly (p<0.01) and controlled with both alcoholic and water extract of all ages and of the concentrations used. The alcoholic extracts of neem leaf was most effective in comparison to aqueous extract for retarding the growth of Rhizopus and Aspergillus. The crude aqueous and alcoholic leaf extracts of neem was more effective in inhibitions of growth of the fungi Aspergillus in comparison to inhibitory effects on Rhizopus growth in the artificial culture medium. Leaf extracts of neem which are cheap and environmentally safe are promising for protecting crop species against the fungal infestation and leading towards improvement of the crop in terms of yield and productivity. @ JASEM

Impact of combined exposure of chemical, fertilizer, bio-fertilizer and compost on growth, physiology and productivity of Brassica campestries in old alluvial soil.

Abstract: Field experiment was carried out during November 2006 to February 2007 under old alluvial soil to evaluate the impact of combined dose of chemical fertilizer, biofertilizer in combination with compost for the yellow sarson (Brassica campestries cv. B9) in a randomized block design replicated thrice. Various morpho-physiological parameters viz., plant population, length of shoot and root, leaf area index (LAI), crop growth rate (CGR), net assimilation rate (NAR), yield attributes viz., number of siliquae per plant, number of seeds/siliquae, 1000 seed weight (test weight), seed yield, stover yield and physiological and biochemical parameters viz., pigment content, sugar, amino acid, protein, ascorbic acid content in physiologically active leaf were performed. The treatment T1 i.e., 40% less N fertilizer 25% less P fertilizer K fertilizer constant + 12 kg ha(-1) biofertilizer (Azophos) and organic manure (compost) @ 5Mt ha(-1), showed the maximum chlorophyll accumulation (10. 231 mg g(-1) freshweight), highest seed/siliquae (25.143), test weight of seeds (4. 861g) and highest seed yield (10.661 tha(-1)). A comparison between all the morphological, anatomical, physiological and biochemical parameters due to application of chemical fertilizer; bio-fertilizer and compost alone and in combination and their impact on soil microorganism, flora and fauna will throw a sound environmental information.