海量图书期刊资源，随时随地畅享阅读乐趣
Measurement of N2fixation in maize (Zea maysL.)—ricebean (Vigna umbellata[Thunb.] Ohwi and Ohashi) intercropsb. Rerkasem; K. Rerkasem; M. B. Peoples; D. F. Herridge; F. J. Bergersen · 1988