National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Investigations on evaluation of effect of different nitrogen sources on major insect pests infesting okra was carried out at the Department of Entomology, Rajasthan Agricultural Research Institute, Durgapura, Jaipur during kharif 2016 and 2017. The major insect pests infesting okra observed during two consecutive seasons were leaf hopper, A. biguttula biguttula; whitefly, B. tabaci and okra shoot and fruit borer and E. vittella. Different sources of nitrogen were applied as different treatments to the okra crop. The fertilizers applied were urea, vermicompost and farm yard manure and their different combinations. Maximum nitrogen content in leaf of okra was observed in treatment where, 75 percent nitrogen was applied through urea and 25 per cent was applied through vermicompost. Maximum population of leaf hopper and whitefly was observed in treatment where, all the nitrogen was applied through urea (6.94 & 8.37 per plant) and minimum population was recorded from treatment where, all the nitrogen was applied through vermicompost (2.27 and 2.34 per plant). Maximum fruit infestation was recorded in treatment, where all the nitrogen was applied through urea i.e. 14.39% (on number basis) and 21.55% (on weight basis).
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