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Chanchan M.,Bidhan Chandra Krishi Viswauidyalaya | Hore J.K.,Bidhan Chandra Krishi Viswauidyalaya
Research on Crops | Year: 2014

A field experiment was conducted at Horticultural Research Station, Mondouri, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal during 2009-11 to assess the efficacy of some micronutrients, namely, zinc sulphate (0.10, 0.25 and 0.50%), borax (0.1, 0.2 and 0.3%), manganese sulphate (0.10, 0.25 and 0.50%) and ferrous sulphate (0.1, 0.2 and 0.3%). They were applied as foliar spray with the sticker at 45, 60 and 75 days after planting. There were 13 treatments including control. The design was randomised block design with three replications. Maximum plant height, leaf number, weight of bulb, number of cloves per bulb and yield were recorded with borax @ 0.2%. Both length and weight of large clove, weight of medium cloves, root number and breadth of bulb were observed with zinc sulphate @ 0.25%. Maximum length of bulb and length of roots were recorded in borax @ 0.1%. Borax @ 0.2% was found most effective for yield improvement of garlic followed by zinc sulphate 0.25%.


Mandal D.,Bidhan Chandra Krishi Viswauidyalaya | Bhowmik P.,Bidhan Chandra Krishi Viswauidyalaya | Chatterjee M.L.,Bidhan Chandra Krishi Viswauidyalaya
Research on Crops | Year: 2014

The impact of weather parameters on population fluctuation of cotton mealybug, Phenacoccus solenopsis Tinsley was evaluated for monitoring the seasonal and annual trend of 2010-11 and 2011-12 at Institutional Research Farm of Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia, West Bengal, India. The mealybug population was found to be increasing during 11th and 9th weeks in 2011 and 2012, respectively, after sowing of cotton i. e. the 8th and 6th standard weeks during respective years. The peak population 81.37 per 10 cm upper shoot was recorded during 14th standard week in 2011 and 127.44 during 16th standard week in 2012. Correlation studies revealed that population of mealybugs exhibited a significant positive correlation (r=0.733 and r=0.780) with minimum temperature, but significant negative correlation with relative humidity (r=0.646 and r=0.689) and rainfall (r=0.566and r=0.523) during 2011 and 2012, respectively.

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