Avaliação econômica da aplicação de fertilizantes nitrogenados em pastagens destinadas a vacas em lactação

Abstract

RESUMOO crescimento da renda e da população mundial tem demandado um aumento de alimentos e de insumos. Essas questões afetam diretamente a pecuária leiteira explorada em pastagens intensivas. Por meio deste estudo, buscou-se avaliar economicamente a estratégia da fertilização nitrogenada em pastagens destinadas a atividade leiteira, em distintos cenários econômicos e produtivos. Utilizou-se a margem bruta como indicador econômico. Ficou evidenciada a importância da eficiência da utilização de insumos e de forragem. No cenário atual de preços de fertilizante e de leite, a fertilização com nitrogênio (N) foi viável economicamente, principalmente em doses de, aproximadamente, 200 kg de N/ha/ano, quando houve fornecimento de concentrados e 400 kg de N/ha/ano, quando não ocorreu essa suplementação. Neste trabalho, a uréia apresentou melhor resultado econômico em relação ao sulfato de amônio.Tremos pra indexação: Alimentos, demanda, margem bruta, simulação, sustentabilidade. ABSTRACTIncome growth and world population growth has resulted in an increase of demand for food and supplies. These issues directly affect the dairy production in intensive grazing systems. The aim of this article is to evaluate economically the strategy of nitrogen fertilization in pasture for dairy activity in different economic and productive scenarios. Gross margin was used as economic indicator. The importance of efficient use of inputs and fodder was emphasized. In the current scenario of fertilizer and milk prices, fertilization with nitrogen (N) was economically viable, particularly in dosages of approximately 200 kg N / ha / year when there was a supply of concentrates and 400 kg N / ha / year when there was no such supplementation. In this work, the urea presented better economic results compared to ammonium sulfate.

Financial Evaluation, Under Conditions of Risk, in a Family Dairy Production System

“…The technology transition evaluated in this case study has nitrogen fertilization of the soil as an input of great importance in the increase of forage productivity and, consequently, in economic outcomes. Hence, in accordance with the statements of Reis et al [18], the increase in revenues from intensification should be proportionally higher than the expenses with this input; however, variations in demand for food and oil may influence the result. In addition, the impact of intensification is more significant when observing the appreciation, often speculative, of land prices.…”

Productivity and efficiency of nitrogen fertilization in maize under different levels of urea and NBPT-treated urea

“…The most used nitrogen (N) fertilizer in Brazil is urea, and in 2007, 895,000 t were produced, another 2,423.000 t were imported, totaling a consumption of 3,318.000 t, presenting a importation/consumption ratio of 0.73 (Associação Nacional para Difusão de AdubosAnda, 2008). Urea has been demonstrating to be the most viable economically N fertilizer (Deuner et al, 2008;Reis et al, 2010), in spite of the high loss rates through volatilization that occur with its application in the soil surface.…”