Effect of organic amendment on soil microflora and soil borne diseases of potato



Organic farming reduced the population of soil borne microflora resulted in less tuber infection caused by pathogenic fungi and bacteria. Twenty seven, 23, 21, and 17 fungi were recorded at pre, after 10, 50 and 90 days of soil amendments, respectively. The species of Aspergillus, Fusarium, Penicillium, Trichoderma and Verticillum were recorded as the major soil microflora in all soil samples. Among the treatments, the maximum with 356 fungal colonies recorded in case of control, where only crop residue was incorporated in soil after 10 days of amendments where as, after 50 days it was 292, where crop residue was incorporated in soil along with tuber treatment with bio-fertilizer (Azotobacter + Phosphobacteria) + soil application of FYM @ 20 tones/ha. and after 90 days, this population was again higher in control plot. Among the fungi, the maximum number of colonies and relative abundance was recorded in Aspergillus niger with 43 & 12.18%, respectively after 10 days of amendments in case of control. The total population of soil borne microflora was also affected by organic soil amendments. Organic amendments reduced the effect of tuber infection. The minimum infection per cent of common scab and black scurf (6.38% and 11.88%) and minimum rotting per cent of tuber (2.57%) were found in case of incorporation of crop residue in soil alongwith tuber treatment with bio-fertilizer (Azotobacter + Phosphobacteria).

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