Several works show the efficiency of the nitrogen fertilization in the yield increase common bean yield; however, there is need of new studies, because of the economical point of view, the management of nitrogen that corresponds the largest yield of grains many times it does not correspond to the most profitable and, therefore, it does not fit for recommendation to the producer. The objective of the work was to study the effect of sources, doses and nitrogen split in the development and yield of winter common bean in no tillage system, correlated with a simple economical analysis. The trial was conducted in Selvíria county, Mato Grosso do Sul, State, in 2005, in a dystrophic clayey Latosol - Haplustox. A randomized blocks design was used, in a factorial scheme 3x5x2 with 30 treatments and 4 repetitions constituted by three sources of nitrogen (ammonium sulphate, urea and ammonium sulphate ½ of N + urea ½ of N), with different doses of nitrogen (0, 50, 100, 150 e 200 kg ha-1) applied at sowing or split (1/3 at sowing + 2/3 V4-4 growth stage). The source of nitrogen from ammonium sulphate provides larger yield of grains of the winter common bean; however, the urea is that provides larger economical efficiency. The increase of the nitrogen fertilization increases the yield up to 198 kg/ha of N, providing on average an increase of 44% in the yield compared with the control (without N). The nitrogen split was not economically viable.
Phaseolus vulgaris L.; nitrogen management; ammonium sulphate; urea; application way and economical viability
