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

摘要

Common bean is a crop that responds to nitrogen fertilization, and the quantity of N to be used depends on the type of existing vegetal residues on soil surface. In no-tillage system it has been observed N deficiency in common bean crop which makes necessary the anticipation of fertilization and the use of higher quantities of N, due to insufficient availability of N for plants. This occurs mainly when crop is carried out after grass planting or irrigated environment (Soratto et al., 2001; Soratto et al., 2004). Therefore, the objective of this work was to evaluate the N application on seeding and fractioning, upon yield components as well as yield of two common bean cultivars on no-tillage system.