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Articles by S.M. Rezaul Karim
Total Records ( 2 ) for S.M. Rezaul Karim
  S.M. Rezaul Karim and Mashhor Mansor
  Jhum cultivation, popularly known as slash and burn is the most prevalent form of cultivation in the hills of tropical Asian countries including Bangladesh. Jhuming involves cutting patches forests of the mountains in January to March, left on the hill slopes for one month for drying and burning of the dried plants. Small holes are made throughout the sloppy fields and seeds of different crops are sown in the holes in April. Crops are harvested in succession as they ripe between July to December. This study examines the impacts of jhum cultivation on the management of soil and water resources, biodiversity, forest productivity and socio-economic conditions of the jhum cultivators (tribal peoples). A vast area of land comes under jhum cultivation every year in tropical Asia. The jhum cultivation lead to decline of productivity by 50%, the yields are almost equal to the input values and the farmers are experienced food shortage of 2 to 6 months every year. The jhum farmers adopt new occupations to support their livings. An amount of 100 to 250 metric tons of topsoil per hectare are depleted per year due to jhum cultivation. The rotation cycle of fallowing has been reduced from 7-8 to 3-4 years especially in Bangladesh. The forest birds, arboreal mammals and plants were disturbed significantly and a few species are found in the second-growth habitats created by jhum cultivation. The reasons for this mountain degradation were identified as government policies in classifying jhum fallow lands as wastelands or degraded forest which made end of community ownership. Creation of reserve forests, nationalization of jhum land by the government and planned resettlement of plain land peoples into hills are also the reason for mountain degradation and as a consequence of which the jhumias are moving to the marginal lands.
  Md. Fazlul Islam , S.M. Rezaul Karim , S.M.A. Haque , Md. Sirajul Islam and Md. Sirajul Islam
  A pot experiment was conducted to study the effect of Echinochloa crusgalli and Echinochloa colonum on the growth and yield of rice (cv. IR50) during April to July 2002. The results showed that the effect of two weeds pot-1 produced 70.6% yield loss of rice grain and about 97% grain yield was reduced when 8 weeds competed against a single rice plant. The reduction of rice grain at this density was the results of 42.9% reduction of plant height, 92% reduction of LAI, 72.7% reduction of tillers plant-1, 88.5% reduction of panicles/plant and 63.8% reduction of grains panicle-1. Further increase of weed density produced the self-thinning effect of weeds and rice yield increased in comparison to 8 weeds pot-1. It was concluded that Echinochloa crusgalli and E. colonum produced similar effects on grain yield and other plant characteristics of rice.
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