The appropriate and balanced supply of nutrients of the bean plant (Phaseolus vulgaris L.) achieved by liming and fertilization can contribute towards increasing the grain yield and nutritional value. It was evaluated the effect of the levels of fertilization on the productivity, components of the production, composition of macro and micronutrients, protein and tryptophan in the grains of three bean cultivars (Aporé, Pérola and Rudá). The experimental design was composed of random blocks, with four replicates, in split-plot design, considering the different levels of fertilization (N1 - no fertilized; N2 - fertilization level for an expected grain yield of 1,200 kg ha-1, N3 - fertilization for expected grain yield above 2,500 kg ha-1). The split-plot random blocks design consisted of the three cultivars. The fertilizers used were adequate to reach the expected levels of productivity. The higher productivity was obtained when all cultivars were fertilized N3. Rudá cultivar showed the largest levels of Mg, S, Zn, Fe, Cu, Mn and B. Aporé cultivar presented the largest levels of K, N, protein and tryptophan, while the cultivar Pérola showed the largest levels of Ca and P. The fertilizing recommendation to obtain productivity superior to 2,500 kg ha-1, produced the largest levels of K, N, Fe, Cu, Mn, B, protein and tryptophan in the bean grains.
Nutrients contents; protein; tryptophan; Phaseolus vulgaris
