Utilização de Fontes de Nitrogênio em Tanzânia (Panicum maximum Jack.) no final da estação das águas

Abstract

The present work was accomplished with the intention of describing the behavior of sources nitrogens and his action in Tanzania in the corresponding final period the station of the waters (April-May). They were used seven different treatment under four repetitions, being each one of these equivalent sources to 100kg.N.ha-1, except for the treatment corresponding to the witness which came exempts of any manuring. The used sources were: uréia, sulfate of ammonium and nitrate of ammonium; and their respective combinations: uréia (50kg.N.ha-1) and sulfate of ammonium (50kg.N.ha-1), uréia (50kg.N.ha-1) and nitrate of ammonium (50kg.N.ha-1) and, sulfate of ammonium (50kg.N.ha-1) and nitrate of ammonium (50kg.N.ha-1). The samples were picked with use of wood picture representing area of a square meter, being analyzed the matter-drought tenors and of present nutritious in the aerial part of the plants. The studied sources are formulations of easy financial and physical access on the part of producers and rural entrepreneurs and they participate actively of the daily of the same ones when in the accomplishment of covering manurings in forages for won of vegetative growth. It is observed in the results that when inserted in a proportion of available Nitrogen of equal tenor, the sources behave in a similar way not presenting significant differences in the matter-drought tenors, nitrogen, match, potassium and calcium. As for the other nutritious: sulfur and magnesium are observed elevations of the tenors mainly in the treatments that possess sources that it contains sulfur in his/her composition (sulfate of ammonium; sulfate of ammonium and nitrate of ammonium; sulfate of ammonium and uréia).