01812nam a2200217 a 450000100080000000500110000800800410001910000180006024500990007826002160017750000170039352010080041065300300141865300170144865300120146565300080147770000260148570000250151170000230153670000350155916368192022-10-28       2008    bl uuuu     u00u1 u    #d1 aCOELHO, E. F.  aApproach for nitrate balance in the soil solution under fertirrigation.h[electronic resource]  aIn: INTERNATIONAL CONFERENCE OF AGRICULTURAL ENGINEERING; BRAZILIAN CONGRESS OF AGRICULTURAL ENGINEERING, 38.; INTERNATIONAL LIVESTOCK ENVIRONMENT SYMPOSIUM, 8., 2008, Iguassu Falls. [Foz do Iguaçu]: CIGRc2008  aPAP0958.pdf.  aThe use of fertirrigation brings inputs o soil solution that affect solute dynamics and nutrient balance in the soil etted volume.This work has s objective to present an approach for nitrate balance in the soil wetted volume under drip irrigation from readings of electrical condutivity and soil water content using TDR technique. The approach uses a balance for nitrate in he soil solution, based upon the fact that he transport of nitrate is solely convective. Ion concentration is etermined based on a combination of an empirical model for estimating soil solution electrical conductivity (ECw) and a potential model that relates ECw and nitrate concentration in the soil solution.The approach has given satisfactory results,although the absolute values of the estimated dependent variables of the model may not stands for the real values in the soil.However,it can used for analyzing different components of the nitrate balance in the soil (uptake,leaching,infiltration) among fertirrigation events.  aFertirrigation management  aMass balance  aNitrate  aTDR1 aSANTANA JUNIOR, E. B.1 aSANTANA, J. A. do V.1 aSILVA, A. J. P. da1 aVEIMROBER JUNIOR, L. A. dos A.