Browsing by Author "ISLAM, MD. NURUL"

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AGRO-ECONOMIC PERFORMANCE OF GIMA KALMI UNDER GHORA NEEM AND IPIL-IPIL BASED AGROFORESTRY SYSTEMS
(HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR., 2011-07) ISLAM, MD. NURUL; Dr. Md. Alamgir Hasan
An experiment was conducted at the Agroforestry Research Farm of the Hajee Mohammad Danesh Science and Technology University, Dinajpur during the period from 5" April to 20" May, 2009 to investigate the canopy shade effect of ghora neem and ipil-ipil trees, different levels of fertilizer and plant densities on the growth and yield of Gima Kalmi (Jpomoea reptans). There were three canopy orientations viz., no canopy, ghora neem canopy (Melia azedarach) and ipil-ipil canopy (Leucaena leucocephala), four levels of fertilizer viz. no fertilizer, recommended fertilizer, 20% and 40% less than the recommended fertilizer, three levels of plant density viz., 30 cm x 15 cm, 30 cm x 25 cm and 30 cm x 30 cm as treatments of the experiment. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Performance of Gima Kalmi grown under no canopy, ghora neem canopy and ipil-ipil canopy were evaluated. The plant height, number of leaves per plant, number of branches per plant, fresh weight of foliage per plant, yield per plot and yield per hectare grown under ghora neem and ipil-ipil canopy showed significantly reduction than those grown in no canopy. The ranked order of different canopy shade for better performance were no canopy > ghora neem canopy > ipil-ipil canopy. In combined effects of different canopies and different levels of fertilizer the highest plant height, number of leaves per plant, number of branches per plant, fresh weight foliage per plant, yield per plot were 28.89 cm, 78.79, 11.59, 87.79 g were found in no canopy with recommended fertilizers. The combined effects of different canopy and different plant densities on the growth and yield of Gima Kalmi did not show any remarkable variation among the parameters. The combined effects of different plant densities and different levels of fertilizer showed significant variation on the growth and yield of Gima Kalmi. The highest plant height (25.30 cm), number of leaves per plant (68.17), number of branches per plant (10.02), fresh weight foliage per plant (72.04 g) were recorded in 30 cm x 15 cm with recommended fertilizers. The combined effects of different canopy shade, plant densities and different levels of fertilizer resulted statistically significant on the growth and yield of Gima kalmi. The highest plant height (30.10 cm), number of leaves per plant (78.80), number of branches per plant (12.90) were found in recommended fertilizers, 30 cm x 30 cm plant density in open condition i.e. no canopy. The yield per plot and yield per hectare (1.26 kg and 12.60 t) were recorded in recommended fertilizers with 30 cm x 15 cm plant density in open condition i.e. no canopy, respectively. In terms of benefit-cost ratio, the highest benefit-cost ratio (4.28) was recorded from ghora neem + Gima Kalmi based agroforestry system followed by ipil-ipil + Gima Kalmi based agroforestry system than in sole cropping (no canopy, open field condition). So, Gima Kalmi can profitably be cultivated in ghora neem based agroforestry systems.
EFFECT OF DIFFERENT LEVELS OF SEED INFECTION (Bipolaris sorokiniana) AND PLANT POPULATION DENSITY ON LEAF BLIGHT SEVERITY AND YIELD OF WHEAT
(DEPARTMENT OF PLANT PATHOLOGY, 2011) ISLAM, MD. NURUL
The experiment was conducted during the period from May 2011 to April 2012 to find out the effect of seed infection levels and plant population density on leaf blight severity and yield of wheat. Three population density viz. 200 seed/m/, 300 seed/m2 and 400 seed/nr' and six seed infection levels viz. 0%, 5.1 - 15%, 15.1 - 25%, 25.1 - 35%, 35.1 - 45% and 45.1-60% were used. Maximum leaf spot severity in flag leaf stage (0.36), panicle initiation stage (0.64), flowering stage (1.57), milk stage (1.84) and hard dough stage (2.30) was found in the interaction between sowing seeds @ 400 seeds/rrr' with 45.160% seed infection level. In every growth stage of the plant significantly lower leaf blight severity was recorded in the interaction between 200 seeds/nr' with sowing of 0.0% infected seeds. Similar trends in disease severity were recorded on penultimate leaf in above mentioned growth stage. Significantly higher number of grains/ear (58.00) and healthy grains/ear (55.67) was recorded under the treatment TI (0% seed infection) with a seed rate of 200 seeds/m/. Lower number of diseased grains/ear (2.33) were recorded under the treatments T6 with 400 seeds/m/ and Tl with 200 seeds/m'. Weight of diseased grains/ear ranged from 0.07 g to 0.75 g where the lowest value was recorded under Tt X 200 seeds/nr' treatment combination. Significantly higher (45.60) grain weight of 1000 seeds was recorded under the treatments TI (0% seed infection) with a seed rate of 200 seeds/mi. Straw yield under different treatment combinations ranged from 3.17-4.21 t/ha where the highest straw yield was obtained under the treatment combination of TI X 200 seeds/mi. Grain yield was significantly the highest (3.43 t/ha) when healthy seeds (0% infection) were sown @ 200 seeds/m'.