Implementation methods and sources of fertilizers of the soybean crop

Abstract

The management of fertilization interferes with the efficiency of fertilizers and the adoption of different methods of application must include the operational aspect, agronomical and economical. The study aims to evaluate the sources of efficiency of fertilizers and application methods in soybean. The study was conducted in 2012/2013 and 2013/2014 agricultural years a Oxisol, in Cruz Alta, RS, Brazil. The treatments consisted of four sources of fertilizer and two application methods in the experimental design of randomized blocks with four repetitions. The fertilizer sources are: MicroEssentials® S9 pure (09.46.00); MicroEssentials® S9 mixed with other raw materials (07.34.12); Monoammonium Phosphate (MAP); Formula 00.20.20, and the doses adjusted so as to be kept the same nutritional ratio at 92 kg ha-1 for P2O5 and K2O, with the use of KCl (00.00.60) casting on the surface. Different sources were applied to broadcast at the soil surface and in the row. The highest soybean yield is associated with both the use of MicroEssentials® S9 07.34.12 in the row or throw on the surface. The lower productivity of soybean is associated with the use of Formula 00.20.20, particularly when applied to the row sowing. The residual effect of the fertilizers sources applied only to the sulfur content (S) in the soil.