Utilização de água residuária de suinocultura como fonte de nitrogênio para o solo

Abstract

The disposal of residuary water from swine production in soil is a recycling activity that makes possible the use of the hydric potential and the nutrients present in these effluents. The swine dejections have great fertilizing potential, being able to favor the producer that will reduce the costs with fertilizer application, as the environment, since these dejections are highly pollutant when launched directly in rivers and lakes. The pollutant potential of the swine dejections is very superior to other animal species and its use as organic fertilizing can also contribute for the contamination of the hydric resources and the soil if were applied amounts superior to the capacity of soil and plants in absorbing the nutrients present in these residues. The nitrogen is one of the main nutrients present in swine dejections. The mineralization of nitrogen is influenced, among others factors, for the temperature and the water content in the medium. Although many attempts for the development of indices that make possible to esteem as a simple and efficient form the capacity of organic nitrogen mineralization in soil, success due has not been gotten by the complexity of factors that affect the dynamics of this element. Although advantages of the use of swine dejections as fertilizing are evidenced, is reduce the knowledge about the mineralization of organic nitrogen present in this dejection. In this context, this work deals with the use of swine dejections as an alternative for fertilization in soil with emphasis in the mineralization of organic nitrogen.