ABSTRACT. The addition of organic and inorganic amendments can improve soil structure and reduce soil compaction. In this context, this study aimed to evaluate whether the application of amendments reduces penetration resistance (PR) in the short term and describe the spatial variability of PR in the surface horizon of an Aquic Argiudoll under no-tillage in northeast Argentina. Four treatments, consisting of surface applications of 7.5 Mg ha−1 poultry litter (PL), 3.0 Mg ha−1 gypsum (G), the combination of PL+G, and untreated control (T), were arranged in a complete randomized block design with three replications. Two more treatments were added to the experiment 12 months later, consisting of PL reapplications on half of the surface of the PL+G and PL treatments (PL+G+PL and PL+PL, respectively) in a split-plot design with three replications in 4×20-m plots. PR was determined in the field with an Eijkelkamp penetrologger following a 2-m long transect perpendicular to the sowing direction at 10 different spots separated 0.2 m from each other. The spatial variability was quantified for each treatment using semivariograms. The highest PR was observed in the T treatment (1.96 MPa) and the lowest PR in PL+G+PL (0.21 MPa). All treatments showed a high spatial dependence (94.9 to 99.9%). Treatments with PL reapplication (PL+PL and PL+G+PL) showed profiles with lower PR and more homogeneous kriging maps. PL reapplication on PL treatments showed no effects on PR values. However, PL reapplication on the PL+G treatment led to positive effects in all PR ranges. Thus, the PL+G+PL treatment, which had the highest PR values, showed a decrease in PR from 54.17 to 6.65% with the reapplication 12 months later. The addition of organic and inorganic amendments reduced specific compacted soil areas on the surface horizon of an Aquic Argiudoll under no-tillage.

Resumo: A adoção do sistema de confinamento de bovinos permite maior controle dos custos, porém o levantamento dos gastos deve ser bem planejado. O presente estudo objetivou analisar e avaliar a viabilidade econômica da produção de um confinamento de bovinos de corte, em Auriflama, SP. Os custos com insumos integraram 85,14%, porém obteve índice de lucratividade 68,55% e valor presente líquido positivo a partir do 4º ano. Considerando as análises estudadas, a pecuária apresenta ser uma atividade rentável e viável.

Abstract: The adoption of the cattle feedlot system allows greater control of costs, however, the survey of spending must be well planned. This study aimed to analyze and evaluate the economic feasibility of producing a feedlot beef cattle in Auriflama/SP. Input costs have integrated 85.14%, however obtained profitability index 68.55% and positive net present value from the 4th year. Considering the analysis studied the livestock had to be a profitable and viable activity.

Resúmen: La adopción del sistema de engorde de ganado permite un mayor control de los costos, sin embargo, la encuesta de gasto debe ser bien planeado. Este estudio tuvo como objetivo analizar y evaluar la viabilidad económica de la producción de una carne de ganado de engorda en Auriflama/SP. Costos de los insumos han integrado 85,14%, sin embargo obtenido índice de rentabilidad 68,55% y el valor presente neto positivo desde el cuarto año. Teniendo en cuenta el análisis estudió la ganado tenía que ser una actividad rentable y viable.

Résumé: L'adoption du système de bovins d'engraissement permet une plus grande maîtrise des coûts, cependant, l'enquête sur les dépenses doit être bien planifiée. Cette étude visait à analyser et évaluer la faisabilité économique de la production un parc d'engraissement de bovins de boucherie dans Auriflama/SP. Les coûts des intrants ont intégré 85.14%, cependant obtenu indice de rentabilité 68,55% et la valeur actualisée nette positive à partir de la 4ème année. Considérant l'analyse a étudié bétail devait être une activité rentable et viable.