THE MICROFLORA OF LEACHED ALKALI SOILS

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Abstract
A study was made of the microorganisms developing on Ashby agar from a leached synthetic alkali soil. Sixteen organisms were obtained in pure culture. Of these, 12 fixed N, their N-fixing ability varying from 1.4 to 7 mgm. Seven fixed over 4 mgm. in the 5-weeks'' incubation period on sterile soil to which 2.5% mannitol had been added. Of the 16, 12 produced over 5 mgm. of NH3 in 4 days on a 1 % peptone solution. It was found that 5 of the organisms decomposed urea, whereas none decomposed cellulose.

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