Improving Bush Bean (Phaseolus vulgaris L.) Yield and Quality by Increasing Soil Nutrients with Organic Fertilizer

Background: Evaluate the effect of organic fertilizers and amino acid foliar fertilizers in combination with different chemical fertilizers levels on the change of soil nutrients and bush bean yield (Phaseolus vulgaris).
Methods: With six treatments and three duplicates, the experiment was designed using full randomization, each corresponding to 3 pots. The treatments in the experiment included- (1) 100% NPK (200 kg N/ha + 150 kg P2O5/ha + 100 kg K2O/ha, (2) 70% NPK + 2 tons of organic fertilizer (O.F)/ha, (3) 50% NPK + 4 tons of O.F, (4) 100% NPK + amino acid (4 ml/liter), (5) 70% NPK + 2 tons of O.F + amino acid (4 ml/liter) and (6) 50% NPK + 4 tons of O.F + amino acid (4 ml/liter). The experiment was carried out over two successive seasons.
Result: The results show that applying 4 tons/ha of organic fertilizer combined with 4 ml/liter of amino acid foliar fertilizer reduces NPK by 50% (100 kg N/ha+75 kg P2O5/ha+50 kg K2O/ha+4 tons/ha of organic fertilizer+4 ml/liter amino acids) helps to improve pH and N, P available in the soil and at the same time helps to increase significantly and statistically (p less than 0.05) in terms of plant height, trunk diameter compared to fertilizer application of 100% NPK. In addition, the amount of nitrate in the bean decreased significantly. The increase in brix level was statistically different from the control when applying a 50-70% reduction of NPK, using 2-4 tons of organic fertilizer and spraying with amino acids.
