The nitrogen (N) from fertilizers has different fate, some of which affect the environment or the human health, e.g. nitrates in groundwater. We determined the fate (plant organs, soil organic matter, remaining nitrates and volatilization) of the N applied to field-grown direct drilling maize. An experiment was carried out in a Typic Argiudoll at Chivilcoy,… (More)
In this paper, the concepts of uniform stability and fixed-station stability of parametric difference linear systems are introduced in order to guarantee the boundness of solutions for such systems. Spectral sufficient conditions for stability of parametric differential linear systems are given.