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Journal of Entomology

Year: 2017 | Volume: 14 | Issue: 4 | Page No.: 176-185
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Authors

Abdul Sadat

Abdul Sadat

Kaushik Chakraborty

Keywords

Research Article

Estimation of Jute Leaf Chlorophyll Content and Dynamics of Semilooper in Relation to Nitrogen Topdressing

Abdul Sadat Abdul Sadat's LiveDNA and Kaushik Chakraborty
Background and Objective: Jute is a bio-degradable fibre crop with high value in agrarian India economy and deserves agricultural attention because it can minimize use of non-degradable plastic products. A portable chlorophyll estimating tool (SPAD 502 meter) is useful for instant chlorophyll measurement both in field and laboratory conditions and may be ideal for determining nitrogen (N) requirement, since the laboratory method for determining chlorophyll content from leaf tissue is time consuming, laborious and destructive. This study was designed with objectives to evaluate relationship between chlorophyll content of jute leaf with nitrogen topdressing as conventionally adopted by the farmers and dynamics of jute semilooper incidence at Uttar Dinajpur, West Bengal. Materials and Methods: To achieve this objective, periodic occurrence of pest incidence and leaf chlorophyll content was assessed in relation to N topdressing and accordingly their correlation were statistically analysed by one-way ANOVA and KyPlot. Results: In 2017 semilooper population was initiated at about 18th standard meteorological weeks (SMW) and gradually increases upto 30th SMW. Linear regression and simple correlation analyses evicted a clear significant increase in leaf chlorophyll content and incidence of Anomis sabulifera having a consonance with the amount of field nitrogen fertilizer application. Conclusion: This study will supposed to specify the time-fitted field application of N fertilizer in field condition to achieve higher fibre yield keeping semilooper population at lowest level which will minimize field application of both fertilizers and pesticides leading to eco-friendly sustainable production system.
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