Early nitrogen supplementation stimulates the nodulation and growth of common bean plants inoculated with rhizobium

The initial development of common bean plants (Phaseolus vulgaris L.) relying on symbiotic nitrogen (N) can be limited by delayed active N2 fixation, requiring supplemental N which in turn may inhibit the symbiosis. Five experiments were carried out hydroponics to identify initiation nodulation and nitrogenase activity cultivars, effects additions mineral plant growth. Three evaluated growth five inoculated cultivars absence or presence N, two effect moment addition until beginning reproductive stage. first root nodules appeared 10 days after transplant (DAT) initiated 11 DAT. Cultivars large seeds had lower than those small seeds. Inoculated showed shoot that lasted 21-25 DAT as compared receiving N. Addition reduced nodule mass more intensively number strongly activity. Nitrogen applied 15 enhanced without limiting growth, throughout their Otherwise, received only inoculated. results indicate did not suffice an adequate beans some is necessary. This should added cycle stimulate inhibiting further fixation.