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Potassium-based fertilizer potentially reduces the incidence of sucking insects on okra and increases marketable yield

Author Affiliations

  • 1Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
  • 2Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh
  • 3Department of Entomology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Int. Res. J. Biological Sci., Volume 9, Issue (4), Pages 50-58, November,10 (2020)


Plant nutrition has a substantial role on the susceptibility of plants to sucking insect pests. Hemipteran insects are very much sensitive to plant nutritional profiles. Higher than recommended level of P and K-based fertilizers would be the potential alternate of conventional insecticides for managing sucking insects in field condition. Therefore, in the present study, 10-30% higher amount of N, P and K-based fertilizers in addition with recommended doses were evaluated on the pest density of sucking insects like jassids, whiteflies and aphids on okra at different time of the study period. After given each specific treatment, data were recorded on number of sucking insects per leaf, number of curled leaves per plant and uninfested yield of okra. According to the reuslts, 30% extra application of K-based fertilizers remarkably reduced pest population density, curled leaf formation and increased yield compared to control (recommended doses of K) that was followed by 20% extra K. Application of 10% extra K was found less effective compared to 20 or 30% K. In case of phosphorus fertilizer, only 30% extra P-based fertilizer in addition with recommended doses has provided good results in reducing population incidence but 10 and 20% extra application was found less effective. 30% extra application of N-based fertilizer in addition with recommended doses strongly increased population density and decreased pod yield compared to control or 10 and 20% extra N. Benefit-cost ratio analysis showed that the highest benefit or return was found when okra plants were treated with 30% extra K-based fertilizer that was followed by 30% extra P-based fertilizer. The lowest return was found from 30% extra N-based fertilizer treated plots. Hence, application of 30% extra K-based fertilizers in addition with recommended N-P-K doses would be the potential alternate of conventional chemical insecticides in managing sucking insects like jassids, whiteflies, aphids etc. in field condition.


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