Complementarity of biochar on aflasafe biocontrol agent to aflatoxin contamination in groundnuts (Arachis hypogea L.) under screen house conditions

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Complementarity of biochar on aflasafe biocontrol agent to aflatoxin contamination in groundnuts (Arachis hypogea L.) under screen house conditions

Joshua J. Ibrahim, Ernest Mbega, Angela Mkindi, Arnold Mushongi
Int. J. Biosci.24( 6), 100-113, June 2024.
Certificate: IJB 2024 [Generate Certificate]

Abstract

Biochar amendment is acknowledged to suppress the effect of pathogenic fungi and favour plant resistance against soil‐borne pathogen effect. The study tested the sole role of Biochar’s efficacy in managing Aflatoxin in groundnuts and when integrated with Aflasafe (aflatoxin biocontrol). This study was done at NM-AIST screen house where groundnut seeds were planted in pots filled with the mixture of soil and Biochar at the rates of 2.5%, 5% and 7.5% in April 2022. At a blooming stage, toxigenic and atoxigenic A. flavus strains were applied. After 120 days, groundnut seeds were harvested and sent to the ILRI laboratory in Kenya for aflatoxin quantification.  Biochar showed a suppressive effect on toxigenic A. flavus by significantly reducing aflatoxin contamination in groundnuts. A negative correlation between Biochar and aflatoxin content was observed when the biochar rate was increased to 5%; above this rate, there was a slight increase in aflatoxin content. Aflatoxin contamination was observed to be comparatively less in the integration of Biochar and Aflasafe biocontrol. For example, the application of 5% Biochar and 2 x 106 aflasafe showed a 99.97% reduction compared to the control, while sole Biochar and aflasafe reduced aflatoxin by 85.6% and 90%, respectively. Biochar-amended soils indicated a dramatic increase in pH, CEC, Mn, P, K, Ca, B, Zn and Si. Over space and time, the long-term positive effects of Biochar potentially offer options for scaling up Aflatoxin control at pre-harvest crop growth and development stages.

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