Pakistan journal of biological sciences : PJBS · 2013
Efficiency of utilization of nitrogen coated with urease inhibitor in maize.
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Okumura Ricardo S, Mariano Daiane de C, Zaccheo Paulo V C, de Albuquerque Amanda N, Giebelmeier Carmo G, da S Lobato Allan K, Franco Antônio A N, de Oliveira Neto Cândido F, Saldanha Eduardo C M, da Conceição Heráclito E O, da Silva Raimundo T L
Аннотация
This study aimed to evaluate under field conditions the efficiency in the use ofN coated with urease inhibitor in maize. The experiment was conducted in the year of 2007/2008. The experimental design was a randomized block design in a factorial 2 x 6, with five repetitions, constituted the N sources (common and coated with urease inhibitor) and levels (0, 40, 80, 120, 160 and 200 kg ha-1 of N) sidedressing nitrogen application in the growth stage V4. Based on the data obtained were determined recovery efficiencies, utilization, agronomic and physiological N applied. In all cases, the efficiency levels for maize were influenced by levels of sidedressing nitrogen application, in which increasing levels of N resulted in a decrease of the efficiencies, regardless of the source being common urea or coated with urease inhibitor.