Efeito da Fertirrigação com Água Residuária de Suinocultura nos Atributos Químicos do Solo e na produção dos Capins Tifton 85 e Xaraés

• Autor(a) principal: Rezende, Vinícius de Oliveira
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2025
• topic: Pastagem; Nitrogênio; Grazing; Nitrogen; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO::MANEJO E CONSERVACAO DO SOLO

Swine wastewater (ARS) is a valuable resource. It provides soil nutrients for agriculture, thus reducing the necessity of using mineral fertilizers. Strategies have been defined that are suitable for the use of this effluent and that minimize the risks of pollution, often associated with its use. However, the quantities and frequencies of ARS that should be applied to the soil vary with the nature and composition of the waste, climate conditions and the plant species cultivated. This study sought to evaluate the application of swine wastewater in terms of an analysis of the yield of dry matter, nutrient uptake by forage crops and chemical soil attributes. Two experiments were conducted to ascertain the effects of the application of increasing doses of ARS: 0, 500, 1000, 1500, 2000, 2500 m3 ha-1 on the chemical properties of an Oxisol and the production of dry matter of two forage cultivars: Xaraés (Brachiariabrizantha) and Tifton 85 (Cynodondactylon x Cynodonnlemfuensi). The amounts of nutrients extracted from the density and height of the pre-grazing sward, the rate of accumulation and carrying capacity were evaluated. The experimental was conducted using a randomized block design. Data were subjected to an analysis of variance and regression analysis. Both experiments showed that the application of ARS is feasible for the grasses. There was a linear increase in dry mass, height and stocking rate in relation to the quantities applied. For the Tifton 85, only the percentage of dry mass was reduced with increasing doses. The use of ARS did not restore the amounts of calcium, magnesium and manganese extracted by the forages. Potassium was the nutrient most extracted by Xaraés, surpassing the 61% nitrogen. Using nitrogen as the nutrient reference, a dose of 500 m3 ha-1ARS was found to be the most suitable for the two grasses. It was concluded that Tifton 85 and Xaraés can be recommended for intensive forage production management with use of ARS. These grasses yielded high levels of mass production and high nutrient uptake even under conditions of drought. Index terms: grazing, nitrogen, productivity.