Influence of weather parameters, nitrogen and potassium levels on foliar blight severity of barley under three different sowing dates
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SUNITA MAHAPATRA*, NITAI MUDI and SRIKANTA DAS
Keywords:
Barley, dates of sowing, growth function, leaf blight, meteorological factors, N&K levelsAbstract
A field experiment was conducted to assess influence of ten weather parameters (maximum temperature, minimum temperature, maximum relative humidity, minimum relative humidity, wind velocity, bright sunshine hour, evaporation, total rainfall, soil temperature and vapour pressure) and three different levels of N (40,60,80 kg ha-1) and K (20, 40,60 kg ha-1) on the foliar blight severity of barley under three different dates of sowing (early: 30th Oct., timely: 15th Nov. and late: 15th Dec.). The experiment was conducted in Gangetic alluvial soil of West Bengal during rabi season at Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia in three consecutive years (2010-11, 2011-12 and 2012-13). Results showed minimum disease severity in high N and K combinations (N80 K60) irrespective of other treatment combinations in all the three dates of sowing. Whereas, late sown crop shows maximum disease severity irrespective of different N and K combinations. Timely and early sown crop recorded minimum foliar blight severity and maximum grain yield under maximum N and K combinations. Among the ten meteorological factors, maximum temperature, minimum temperature, minimum relative humidity, wind velocity, bright sunshine hour, evaporation were the influential to express disease severity under three different dates of sowing in different N and K combinations. Growth functions of disease severity were developed and based on correlation co-efficient (r) value and among the two growth functions (Logistic and Gompertz) Gompertz was found to be fit better for linearising the disease severity in comparison to Logistic growth model.
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