Avaliação espacial de atributos químicos do solo no semiárido.

Abstract

The soils of the semiarid region characterized by being shallow, rocky, high chemical fertility due to low activity of bioclimatic region, reduced leaching of nutrients and plenty of easily weathered primary minerals. But is not this a myth? The soil is really fertile? To elucidate these issues the current research aims to diagnose soil fertility in various counties in the semiarid northeast. The methodology consisted of survey of 645 chemical analysis of soil organic matter except that 185 were derived from the semiarid region of the States of Paraiba, Pernambuco, Rio Grande do Norte and Ceara, covering 51 counties. The results were tabulated and analyzed using descriptive statistics and interpreted according to the distribution of their frequency. Most chemical properties showed high variability, the predominance of reaction slightly acid, high amounts of calcium, magnesium, potassium, total bases, T value and base saturation and low concentrations of phosphorus, sodium, organic matter and potential acidity. During soil management must pay attention mainly to the need for fertilization and organic.