Nitrogen fertilization with conventional and slow-release urea in two forms of application on maize

Hianka Carara de Souza, Eliete de Fátima Ferreira da Rosa, Jéssica Fernandes Kaseker, Marcos André Nohatto, Mikael Cardoso dos Santos

Resumo


Urea is the nitrogen fertilizer most used in agriculture and the most subject to N losses. Thus, it is important to look for alternatives to reduce these losses and increase agronomic N use efficiency. In this sense, this study evaluates the effect of split or single application of slow-release and conventional urea in maize development and yield, as well as the fertilizer use efficiency by plants. The experiment was carried out in Santa Rosa do Sul - SC, in a randomized complete block design with 5 treatments and 3 replicates. The treatments evaluated were: con­trol; 100% of the recommended dose of conventional urea at sowing; 30% of the recommended dose of conven­tional urea at sowing and 70% at topdressing; 100% of the recommended dose of slow-release urea at sowing; 30% of the recommended dose of slow-release urea at sowing and 70% at topdressing. The variables analyzed were ear insertion height, stem diameter, leaf chlorophyll content (R1 stage), yield components, crop yield, and nitrogen use efficiency. The split application of slow-release urea to the soil positively affected stem diameter and nitrogen use efficiency in maize plants, being, therefore, a good fertilization alternative for the crop in the soil and climate conditions of the region.


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DOI: http://dx.doi.org/10.15361/1984-5529.2019v47n3p304-312