Influência da adubação orgânica nas propriedades químicas de um Latossolo Vermelho distrófico e na produção de matéria seca de Brachiaria brizantha cv. Marandu

Abstract

Aiming at discovering the influence of organic fertilization upon the chemical properties of a dystrophic Red Latosol cultivated with Brachiaria brizantha cv. Marandu, as well as, on the production of dry matter, an experiment was set in Cidade Gaucha, a small town located in the Northwest of Parana state. Doses of poultry manure or waste 0, 5, 10, 15 and 20 t ha-1 and 100 kg ha-1 of nitrogen, in the form of urea, were tested. The production of dry matter presented a linear growing. Such a growing was due to the increase in the poultry manure control treatment applied onto the pasture. The 20 t ha-1 maximum dose tested was 321% superior to the testing dose without any fertilization and 96.6% superior to the chemical fertilization. There were significant differences regarding the variables such as, Potassium, Phosphorus and Carbon content, whereas, for pH, H+Al, Ca, Mg and CTC there were no significance. However, there was a significant difference concerning pH in relation to testing without any fertilization.