However, various HS-based products have appeared in the market in the last years, which are usually extracted from peat or leonardite, enriched or not with nutrients and registered at the Ministry of Agriculture, Livestock and Food Supply (MAPA) as organic fertilizers, organomineral fertilizers or soil conditioners, although they are commercialized as plant biostimulants (Benites et al.
Considering that HSs can favor the cultivation of plants, the soybean crop will also benefit from their application; however, it is notable the need for studies aiming to establish an ideal dose of the organomineral fertilizer.
Thus, this study aimed to evaluate the effect of the application of doses of organomineral fertilizer enriched with HSs on the growth, development, mineral nutrition and yield of soybean cultivated under water stress conditions.
The organomineral fertilizer was enriched with humic substances extracted from peat through chemical fractionation using 0.
The experiment was set in a randomized block design, in 2 x 5 factorial scheme, which corresponded to two levels of soil moisture (90 and 30% of water holding capacity SWHC) and five doses of organomineral fertilizer enriched with humic substances (0, 1, 2, 4 and 8 mL per [dm.
At each soil moisture level, there were increments and all of them followed a quadratic model as a function of organomineral fertilizer doses (Figures 1A to 1E).
3]), may have been due to the deleterious effects caused by the high dose of the organomineral fertilizer (Figures 1A to 1E).
coli and Salmonella demonstrate that the organic and organomineral fertilizers did not contaminate the soil.
Organic and organomineral fertilizers made with poultry manure did not contaminate the soil with enteropathogenic bacteria after 30 days following application.
The quantities of mineral fertilizer used in the mineral and organomineral fertilizer treatments were designed to match the amount of N, P and K applied in the organic fertilizer treatments (Table 2).
However, at 30 days after fertilization (DAF), the difference in population density between the soils fertilized with organic fertilizer or organomineral fertilizer (CFU < 2,0 [g.