artigo

e-ISSN 1983-4063 - www.agro.ufg.br/pat - Pesq. Agropec. Trop., Goiânia, v. 41, n. 3, p. 391-398, jul./set. 2011

COMBINAÇÕES DE FONTES DE NITROGÊNIO
NO DESENVOLVIMENTO E RENDIMENTO DO FEIJOEIRO1
Renato José Afonso2, Orivaldo Arf3, Denis Santiago da Costa4,
Rafael Marani Barbosa5, Salatier Buzetti3, Marco Eustáquio de Sá3, Ricardo Antônio Ferreira Rodrigues3

ABSTRACT

RESUMO

COMBINATION OF NITROGEN SOURCES
ON COMMON BEAN GROWTH AND YIELD

Nitrogen is one of the most lixiviated plant nutrients on soil and it can also be dispersed in its gaseous form, limiting many crops yield. Thus, this study aimed to evaluate the effect of N sources (urea and ammonium sulfate) combinations, at
80 kg ha-1, isolated or combined, with or without irrigation water incorporated to the soil. The experiment was carried out in
Selvíria, Mato Grosso do Sul State, Brazil, during two growing seasons (2003 and 2004), in the winter, by using a randomized block design with 12 treatments, in a 6x2 factorial scheme, with four replications. Six N sources combinations were used: control
(without N); 80 kg ha-1 of N - ammonium sulfate (AS); 20 kg ha-1 of N - urea (U) + 60 kg ha-1 of N (AS); 40 kg ha-1 of N (U) +
40 kg ha-1 of N (AS); 60 kg ha-1 of N (U) + 20 kg ha-1 of N (AS); and 80 kg ha-1 of N (U), with and without addition of irrigation water. It was possible to conclude that the nitrogen supply, regardless of the source used, provided an increase in grain yield.
No difference was observed, concerning the nitrogenous fertilizer incorporated or not to the soil with irrigation water.

O nitrogênio é um dos nutrientes de planta mais lixiviados no solo, sendo, também, perdido na forma gasosa, o que pode limitar o rendimento de muitas culturas. Neste sentido, este trabalho objetivou estudar o efeito de combinações de fontes de N (ureia e sulfato de amônio), na dose de 80 kg ha-1, em aplicação isolada ou em mistura, com ou sem incorporação ao solo de água de