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Studies on organic soil amendments in relation to biocontrol of Fusarium oxysporum f.sp. ciceri causing wilt of gram

Bhrigunath Singh and Aanil Kumar
University Department of Botany, Magadh University, Bodh Gaya -824234
Received ………………….. Revised……………………

Abstract : In the present investigation the role of amendment of soil with high and low C/N plant residues i.e., water hyacinth, wheat straw and castor cake in reducing the number of propagules (cfu –1dry soil x104) of Fusarim lycopersici f.sp.ciceri causing in infested soil was determined. Amendments were added separately in different dosages i.e., 0.1, 0.5,1.0,2.0 and 5.0% (w/w) in infested field plots. Periodical isolation of fungal population was done on 7th, 15th, 30th, and 45th days after amendments following serial dilution – plate technique and using Martin’s rose bengal agar and Czapek’s media. Amendments caused significant reduction in number of fusarial propagules with simultaneous many fold increase in total fugal population, effects increasing with dosages of amendments and period of decomposition.  Amendment with castor cake having low C/N ratio was found to be more inhibitory for pathogen propagules than amendment with green plant material of water hyacinth and wheat straw having high C/N ratio.


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