[Adaptation of rhizobium meliloti strains to soil acidity]
2000
Lapinskas, E. (Lithuanian Inst. of Agriculture (Lithuania). Vezaiciai Branch)
Resistance and adaptation to soil reaction of Rhisobium meliloti various strains was investigated in laboratory, pot and field trials over the period 1992-1997. Critical pH values 4.6-5.0 for Rhizobium meliloti strains propagation were determined. Out of the 20 selected strains only 7 adapted to growing at pH value 5.0. The rest of the strains were killed during 2 years of adaptation. Inoculation by efficient and adapted to acid reaction strains A 425a and A 2M24 increased lucerne dry matter yield by 1.30 and 1.02 t/ha or 28 and 35 in pot trials. Inoculation increased the number of nodules in plants in all the cases. However, adapted strains contained 28 more nodules than not adapted ones
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