Poder tampão na recomendação de calagem no sul dos estados de tocantins e goiás.

Abstract

The use of clay as estimator of soil resistance the change of pH presents disadvantages, this because it does not consider all factors that influence under the buffer capacity of the soil, different from the use of the remaining phosphor that determines buffer power considering the clay content, its mineralogy, quantity and quality of organic matter. The objective of this work was to evaluate the use of the remaining phosphorus compared to the use of clay as an indicator of soil buffer power, and thus establish an equation adjustment that allows the use of this estimator for liming recommendation. The work was carried out in a partnership established between the Federal University of Tocantins and the companies Agro Projetos & Consultorias and Sul Goiano Agro. The work was carried out in a partnership established between the Federal University of Tocantins and the companies Agro Projetos & Consultorias and Sul Goiano Agro. Soil samples come from farms in the southern region of the state of Tocantins and southern Goiás state, which were divided according to the clay content in an interval of 5%, adding a total of 130 samples. The buffer power determined by the remaining phosphorus indicator was different from that calculated by means of texture. Multiple equation adjustment compared to simple enabled greater accuracy, and this was reliable of use when compared to buffer indices and liming recommendation by the use of the remaining phosphorus.