The production of organic foods has increased the demand of supplies for this type of agriculture. It is known that organic fertilizers have an important effect on crop and soil properties, but it has not been studied thoroughly. This research assessed the result of the application of seven nitrogenated fertilizers allowed for use on organic production, and a conventional fertilization treatment adjusted to similar total nitrogen (N) doses, testing chemical properties of two soils with contrasting physiochemical properties (Mollison sandy clay and Andisol muddy clay) incubated in aerobic conditions and controlled 6 times during 112 days. The treatments were: Compost (CO), Fertil (F), Purely Grow (PG), Purely Lysine (PL), Blood meal (BM), Lupin meal (LM), Sodium Nitrate (SN), Conventional Fertilization (CF), and a non-fertilized Control (CT). The experiment was conducted in plots divided for each soil. The results showed that fertilizers did affect the soil’s pH and salinity (electric conductivity, CE), as well as its phosphor (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S) concentrations. Generally, the highest pH values, available P and interchangeable K, Ca and Mg were obtained using CO on both soils, while PL reported the lowest values for most of the assessed parameters. The evolution of each parameter over time showed interactions with the fertilization treatment, with a constant pH decrease and a CE increase on both soils. The differences in the average values of chemical properties during incubation regarding their initial values are related to the physiochemical and organic characteristics of each soil.
