Avaliação de técnicas de amostragem do solo e sua relação com a disponibilidade de nutrientes

Abstract

Soil sampling is the first and most important stage of the diagnostic process and, considering that this process is the basis for planning agricultural production systems, soil chemical analysis should be an indicative method for indirect assessment of its fertility. Inaccuracies due to inappropriate sampling methods can affect recommendations for soil fertilization and correction. The objective was to evaluate the relationship of nutrients in the soil correlating with Brachiaria grass biomass in each sampled method. Samples were obtained in five plots in the 0-20 cm layer, with three types of samplers, being precision agriculture drill, straight shovel and probe, for grass sampling, the square method was used and Pearson's correlation test was performed. Areas were evaluated in the municipality of Pontal do Araguaia-MT, Baliza-GO and Torixoreu-MT, both areas with Brachiaria pasture management. All methods were effective in detecting the levels of the elements analyzed in the soil, with little variance between them, as for the correlation with biomass, the most accurate method for the sampled correlation was the straight spade collection. Given the data, it can be concluded that the sampling methods performed well in relation to sample collection and analysis, with little variation between them.