Ion fluxes in the soil solution in forest and pasture in Rondônia (RO)

• Grant number: 03/06971-6
• Support Opportunities: Regular Research Grants
• Start date: September 01, 2004
• End date: November 30, 2006
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: Marisa de Cassia Piccolo
• Grantee: Marisa de Cassia Piccolo
• Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

The concentration of ions in the solution of soil is an important indicator of the functioning of the soil, being essential in evaluations of losses of nutrients through drainage and from the nutritional demand from vegetation. The study of the interferences in the change of the use of land on the characteristics of the soil solution is important in the quantification of the equilibrium of entry and exit of nutrients in the soil and in the evaluation of the effects with the time of alterations of the system on the fertility of the soil. The objective of this work is the evaluation of the effects of the change of land use on the dynamic of the nutrients in the soil solution in a system of natural forest and pasture of low productivity. The research project will be carried out in the Fazenda Nova Vida (RO), in a natural forest system, in a pasture established in 1983 in the process of degradation (low productivity) and in a managed (harrowed and fertilized) pasture established in 1983. With the help of collectors, we will sample the rain water, leached rain, surface run-off water, the soil solution (tension lysimetry) and the leached soil solution (zero-tension lysimetry) to study the entries and exits of ions and of organic and inorganic carbon dissolved. (AU)