Vol. 7 No. 1
Impact of weather variables on weed infestation in wet season rice in West Bengal.
Abstract: As Indian population has been hiking annually 1.2%, while the average growth rate of total food grain production is nearby 0.8%. So the only option to us is to produce more and more food for people. A number of factors have the responsibility for reducing the yield of crop like insect - pests, diseases and weeds. The average yield reduction from weeds in India ranges 12-78%; in transplanted rice 30-40% and in drilled rice it is 70-80%. So, to study the impact of weather variables on population and growth behavior of weeds in rice during rainy season an attempt was made in Bidhan Chandra Krishi Viswavidyalaya, Kalyani, West Bengal, India during 2005 and 2006 with nine treatments replicated thrice. All the weed management practices significantly decreased the number of grasses, sedges and broad leaf weed over the treatment of un-weeded control. At 30 DAT hand weeding at 20 DAT+axadiargyl@.01 kg ha-1 treatment recorded the lowest number of all sorts of weeds. At harvest the lowest density of weeds was observed in hand weeding at 20 and 40 DAT. The weed population was monitored during July-September in both the years. The distribution and intensity of rainfall from June to October was highly favourable for weed development and dissemination rather than total rainfall. It was noted that temperature and humidity had also played significant role for maintaining weed population dynamics.
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