Nitrogen management for common bean crop in new and established no-tillage systems

摘要

The common bean crop has been increasingly cultivated in no-tillage systems, thus it is important to know the responses to nitrogen fertilization in soils under non-conventional management for different periods of time, considering that N availabilityin affected by the soil management system. This work aimed to evaluate the effects of sidedressed N fertilization rates (0, 30, 60, and 120 kg/ha) on common bean crop cultivated in newly implemented no-tillage system and established no-tillage system, without or with application of 60 kg/ha of N at bean sowing. In both systems (newly and established), N fertilization increased shoot dry matter production and grain yield of common bean; however, N applied at sowing was more efficient in increasing shootdry matter. Even with the application of 60 kg/ha of N at sowing, common bean yield was increased by sidedressing N fertilization in both newly implemented and established no-tillage system. The efficiency of sidedressing N was greater in treatments receiving N at sowing.