Ammonia volatilization losses, dry biomass yield and levels of foliar nitrogen on marandu palisade grass after surface-applied urea with urease inhibitor / Perdas por volatilização da amônia, produção de biomassa seca e teores de n foliar de capim marandu após a aplicação superficial de uréia com inibidor
Mariá Schumann, Alline; Tadeu Paulino, Valdinei; Rodrigues Soares, Johnny; Paulo Vargas, Vitor.
Bol. ind. anim. (Impr.);
71: 22-22, 2014.
Artigo
em Inglês
|
LILACS-Express
| ID: biblio-1466623
Resumo
Urea is the N source most widely used in pastures in Brazil. A significant amount of N is lost to the atmosphere by ammonia and nitrous oxide emissions and leached surface or ground water as nitrate contributing to environmental degradation such as the global warming or eutrophication. The loss of nitrogen by ammonia volatilization is a major factor for low efficiency of urea applied in soil surface. An alternative to reducing these losses is the use of urease inhibitors. The aim of this study was to investigate the effects of treating urea with urease inhibitor (NBPT N-(n-butyl) thiophosphoric acid triamide) on the dry biomass yield in pasture of Urochloa (syn. Brachiaria) brizantha Marandu to minimize NH3 volatilization. The study was performed at the Instituto de Zootecnia (IZ) at Nova Odessa, SP, Brazil, in a typic acrudox soil composed of sand (49.5%), clay (20.9%) and loam (29.6%). A randomized experimental design with three treatments and four replications was used. The treatments were: i) No N; ii) Urea; iii) Urea treated with urease inhibitor NBPT. The rate of N was 50 kg/ha applied to the surface of the soil. Measurements of NH3 volatilized were done by semiopen PVC chambers. Controls chambers were added to allow NH3 volatilized from unfertilised soil or contained in the air that swept over the soil surface. We evaluated the yield and plant height, SPAD value and NO artigo não apresenta resumo em português.
Biblioteca responsável:
BR68.1
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