Avaliação da aptidão agrícola pelo método convencional e adaptado para a Fazenda Lavoura Seca

Abstract

Soil is a resource that is present directly or indirectly in human life, either because it is the substrate of food production or source of nutrients for the growth and support of vegetation. Based on potentialities and limitations, several classification systems exist to determine the best management condition. One of the important is the Systems Agricultural Land Suitability Evaluation (SALSE) whose one of the pillars of the system is to guide for a more adequate use of land from information that identifies its limitations and how these limitations can moderate agricultural aptitude, generating a diagnosis guiding the best way to use the soil and additionally recommendations of appropriate agricultural practices. However, this aptitude is not always fully valid for some edaphoclimatic conditions such as the semi-arid, based on this objective of the work was to modify the SALSE for the edaphoclimatic conditions of the semi-arid, adding the attributes stoniness, effective depth and water availability, using the Fazenda Experimental Lavoura Seca, Quixadá as a source of study for the work. Three models of agricultural aptitude were analyzed, the conventional model used as a basis the works of Ramalho Filho & Beek (1994), in the adpted method I disregarded the water limiting factor and the adpted method II, in addition to disregarding the availability of water, modified the parameters of susceptibility to erosion and impediments to mechanization, considering new limits of effective soil depth. The determination of three aptitude models was evaluated based on the profile data of the soil classes identified on the farm. The results showed that for NEOSSOLOS LITÓLICOS there was no change between, classifying as aptitude only for preservation of flora and fauna. Soil such as ARGISSOLOS and PLANOSSOLOS there was a change in better use of aptitude, moving from planted pasture to use in crops. However, there was change in LUVISSOLOS, due to the most limiting factor being nutrient deficiency, a parameter that did not undergo changes in the adapted methods. In this way, it is concluded that, mainly, the limiting factor of water availability, when disregarded, improved the conditions of agricultural suitability classification for some classes.