NITROGEN FERTILIZATION AND GROWTH OF TWO DRY BEAN CULTIVARS IN NO-TILLAGE SYSTEM

摘要

The appropriate management of nitrogen fertilization is fundamental to increase dry bean yield. On no-tillage system the N dynamics is modified by organic material decomposition, which is concentrated on soil surface, providing a temporary immobilization of the N available to plants from fertilization by part of microorganisms. Thus, it requires the using of high N doses in occasion of crops seeding (Sa, 1998). This work was carried out with the objective to evaluate the nitrogen fertilization effect, applied on seeding and fractioning, upon growth and development of two dry bean cultivars on no-tillage system.