Acidez do solo com uso de bioestimulador associado à adubação com NPK na cultura do feijão e do milho

Abstract

In search of the use of more efficient forms of soil nutrients, agricultural inputs have appeared on the market that claim to present technical and agronomic characteristics that condition benefits to the biological, physical and chemical properties of soils. However, the mechanisms of operation of these inputs, can not yet be fully understood, thus requiring research to prove their effectiveness. Among the chemical properties of the soil, the hydrogen ionic potential (pH) needs to receive attention, since most Brazilian soils present problems related to acidity. In this sense, the objective of this work was to evaluate the use of the biostimulator of the Microgeo [marca registrada] soil associated with mineral fertilization with nitrogen, phosphorus and potassium (NPK), on soil pH for bean and corn crops. The experiment was developed at the Experimental the Universidade Tecnológica Federal do Paraná, Dois Vizinhos campus (UTFPR-DV). The experimental design was of randomized blocks with four replications, and with plots of 4 x 6 meters, totaling 24 plots. The treatments used were doses of the biostimulator, recommended by the company, associated with mineral fertilizer (NPK) as indicated in the fertilization manual of Rio Grande do Sul and Santa Catarina (CQFS, 2004). t0 = 0% biostimulator and 0% NPK; t1 = 100% biostimulator and 0% NPK; t2 = 0% biostimulator and 100% NPK; t3 = 50% biostimulator and 100% NPK; t4 = 100% biostimulator and 100% NPK; and t5 = 150% biostimulator and 100% NPK. Bean cultivation was introduced in March and maize in October 2016. Biostimulation fertilizer treatments were carried out before sowing of the crops and mineral treatment with sowing. After harvesting the soil samples were collected in the layers of 0-5, 5-10 and 10 to 20 cm. Subsequently, the soil was air-dried, ground and sieved and the analysis was performed in the UTFPRDV soil laboratory for pH in water and SMP method. For statistical analysis, the software Sisvar 5.6 was used, and analyzed by analysis of variance and Scott Knott's test at 5% probability. The pH values for bean culture ranged from 5.6 to 6.2 for pH in water and from 5.8 to 6.4 for pH at SMP index. For corn, pH values ranged from 5.9 to 6.2 for pH in water and from 6.1 to 6.6 for the SMP index. It was concluded that the use of biostimulators, associated or not with mineral fertilization, did not interfere with soil acidity.