The nitrate problem

The condition we now know as nitrate poisoning is not new. It is an old problem that has been recognized by livestock producers and the medical profession for at least 100 years. However, the danger of nitrate poisoning has become more important in recent years. Also, an increased awareness of the problem has resulted from information appearing in scientific and popular literature. Greater use of commercial nitrogen fertilizers, increased production and use of nitrate-accumulating feeds, improved feeding practices, improper sewage disposal, water contaminated by animal wastes, and the existence of diseases with similar symptoms have all added to the complexity of the problem.</p

REPLANTIO DA VEGETAÇÃO DO ECOSSISTEMA MANGUEZAL DO SACO DA FAZENDA, ITAJAÍ (SC)

Saco da Fazenda is a meadow river abandoned, who is providing natural conditions to mangrove and salt marsh development. Since 1996 Saco da Fazenda has been drained and gross material has been deposited in his edge. This material influences mangrove ecosystem, than it was recommend his replenishment to adjacent area. The replenishment technique applied is plant transportation. It was made a narrow opening around the root system and the tree was transported to another place immediately. Another borrow was opening and the tree was replenished.Compeer replenishment experiment with structural characterization in preserved area was another scope by this research. Than some areas were delimited to know tree diameter, height and density.O Saco da Fazenda apresenta um processo natural e recente de colonização de suas planícies de maré pelo ecossistema manguezal. Durante as dragagens ocorridas no Saco da Fazenda, o material grosseiro foi depositado nas suas margens, o que poderia comprometer o manguezal adjacente. Foi recomendado o replantio da vegetação. A técnica empregada foi o transporte das plantas. Para isso, foi realizada uma escavação ao redor do sistema de raízes e a árvore era imediatamente transportada para outro local. Nessa área foi aberta uma cova e a árvore replantada. Outro objetivo deste estudo foi a comparação entre a área replantada e o bosque natural, para isso fez-se necessário a delimitação de parcelas para obter o diâmetro, altura e densidade de indivíduos