Rice Husk Bio-Char Improves Brinjal Growth, Decreases Insect Infestation by Enhancing Silicon Uptake

To meet the food demand of the increasing world population, use of insecticides is increasing day by day. However, intensive application of insecticides has increased the health risks to the human. Therefore, sustainable alternatives with a limited or no harm to the human and environment are always preferable. A study was conducted to determine the effect of rice husk biochar (RHB) on brinjal growth, mineral nutrients and insect infestations. The soil filled pots (7 kg pot(-1)) were amended with various levels of rice husk biochar (Control, RHB 3.5, RHB 7, RHB 14, RHB 21 and RHB 28 g pot(-1)) and its effects were determined on brinjal plant. Rice biochar (RHB 28 g pot(-1)) amended plant produced maximum biomass. Further, results also showed that higher doses of RHB significantly lower the insect infestation. Biochar treatment has also improved the plant mineral nutrients especially silicon (Si) concentration in the leaves. Hence, it is concluded that RHB tends to reduce insect infestation on brinjal plants by improving Si uptake and it may provide a strategy to sustain brinjal production. However, further studies must be carried out for comparative efficacy of the RHB with insecticide in deterring insect infestation for its widespread recommendations.