Calagem superficial na lixiviação de potássio

Abstract

The management and preparation of soil is of great importance for agriculture in the cerrado, the use of chemical fertilizers and liming are the most adopted measures and that reflects in the highest costs for production, thus, practices must be adopted increasingly assertive to minimize losses and maximize production. Therefore, this study aimed to evaluate the influence of surface liming on potassium leaching in the soil profile. To proceed the study, a trench was opened in the middle of a productive crop, and the experimental design used was a randomized block design, in a 2x3 factorial scheme, corresponding to the presence or not of lime and three soil depths, with 3 repetitions. The first soil analysis was performed on September 15, 2022, and soon after, 250 kg of KCl per hectare in treatment 1 and 250 kg of KCl and 3 tons of lime per hectare in treatment 2. Later, 176 days after the first application, another application of 170 kg of KCl per hectare was made in treatments 1 and 2, and on April 20, approximately 215 days after the first application, the second collection was performed for data comparison. The K+ levels in the soil varied after the application of treatments (KCl and lime), regardless of the presence or absence of lime. In the treatment without lime, potassium levels did not differ in depth; in the treatment with lime, there was a statistical difference between depths, suggesting potassium leaching as a function of liming. The levels of organic matter and CEC were higher in the second collection with the application of KCl and lime treatments. The pH values did not differ between samplings after the application of treatments.