Análise linear e espacial de atributos químicos de um Latossolo sob cultivo de soja em plantio direto em sequeiro

• Autor(a) principal: Souza, Miro Junior
• Data de Publicação: 2022
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/216153
• topic: Soil conservation; Geostatistics; Soil management; Conservação do solo; Geoestatística; Manejo do solo

Knowledge of the spatial variability of soil properties can reduce errors in soil management and the implanted culture, so the analysis of soil variability through Geostatistics techniques can show alternatives for different managements, in order to reduce the effects of variability of soil on agricultural production. This work aimed to analyze the linear and spatial correlations of chemical attributes of an Oxisol under no-tillage soybean cultivation. The work was carried out at the Research and Extension Teaching Farm (FEPE) in the municipality of Selvíria - MS, under the implantation of the soybean crop, where 60 deformed samples were taken at depths of 0.00 - 0.20 m and 0.20 - 0 .40m. The results were analyzed using classical statistics and geostatistics, where the spatial dependence varies according to the chemical attribute evaluated. The attributes that showed spatial dependence were MO2, K1, Mg2 and Al2, the others did not. Maps were obtained through data interpolation, using the kriging method, where the highest coefficient of spatial determination (r2) for the adjustment of the model was that of organic matter at depths of 0.20 – 0.40 (MO2 = 0.964) and the lowest coefficient was for potassium (K1 = 0.322), in addition, the values of the geostatistical ranges of the attributes were between 13m (Al2) and 9.52m (K1). For the same nutrient, the range was different between the layers sampled, denoting in addition to horizontal variability, the presence of vertical variability in the cultivation area.