title: Nodulation and nitrogen fixation on vegetative soybean plants as affected by photoperiod and gibberellic acid.
abstract: Long-day photoperiods and applications of gibberellic acid promoted shoot growth by stimulating leaf enlargement as a result of increasing avaliable photosynthates, which was also reflected in the higher leaf, stem and nodule plant dry weights. Short-day plants had more nodules, but they were smaller (by weight) than those of long-day plants. Gibberellic acid at 1.5×10(-6) M enhanced nodule growth without preventing nodule formation. Factors other than just gibberellic acid are concluded to be involved in the responses of nodulation and nitrogen fixation to day length.
authors.affiliation: Instituto de Fisiologia Vegetal, Facultad de Agronomia, Universidad Nacional de La Plata, CC 31, (1900), La Plata, Argentina.
authors.forename: P A
authors.initials: PA
authors.lastname: Balatti
authors.forename: J J
authors.initials: JJ
authors.lastname: Guiamet
authors.forename: E R
authors.initials: ER
authors.lastname: Montaldi