Ureia de liberação lenta aplicada superficialmente e ureia comum incorporada ao solo no rendimento do milho

By Ederson Antonio Civardi, A. N. D. S. Neto, V. A. Ragagnin, E. R. Godoy, E. Brod. 2011

54 citations recorded by the source corpus.

Urea applied to the soil surface results in high losses of nitrogen (N) by volatilization of NH 3 . The use of polymers covering urea granules is an alternative management to reduce such losses. The experiment was carried out in Entisols (Quartzipsament), with 6% of clay, in the 2007/2008 harvest, in Jatai, Goias State, Brazil, in order to assess the efficiency of the following management systems: urea incorporated to the soil and polymer coated urea applied to the surface, concerning the agronomic and economic aspects of maize cultivation. It was implemented an experimental design in randomized blocks, with eight replications, totaling 24 plots. The covering nitrogen fertilization was performed in a single application, at the V 5 stage. The urea incorporated to the soil resulted in higher values related to ear length and diameter, number of grains per ear, mass of one hundred grains, and relation between earned revenue and invested capital. The highest grain yield and profitability were obtained with the application of urea incorporated to the soil. For each Real (R$ 1.00) invested in the cultivation, the urea incorporated to the soil produced R$ 1.37 as profit. KEY-WORDS: Zea mays L.; slow-release fertilizer; nitrogen; polymers; no-tillage system.

Subfields: Biomedical Engineering, Soil Science

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