Resumo

LARIOS-GONZALEZ, Roberto Carlos et al. Pérdidas de nitrógeno por volatilización a partir de dos fuentes nitrogenadas y dos métodos de aplicación. Siembra [online]. 2021, vol.8, n.2, e2475. ISSN 2477-8850.  https://doi.org/10.29166/siembra.v8i2.2475.

Nitrogen loss volatilization is one of the processes that may be greater depending on edaphic and climatic factors, it also depends on the source and the application method. This study was conducted at the farm El Plantel, owned by the Universidad Nacional Agraria, located at Masaya, Nicaragua. The objective of the study was to quantify the nitrogen losses due to volatilization and its influence on the yield of sorghum (Sorghum bicolor L.). Treatments consisted on two nitrogen fertilizers and two application methods. Treatments were as follow: 46% urea applied to the soil surface, urea incorporated into the soil, ammonium sulfate on the soil surface, and ammonium sulfate incorporated in soil. Nitrogen fertilization was carried out fractionally, 30 % (57 kg N ha-1) at planting and 70 % (133 kg N ha-1) 35 days after planting. The four treatments were set up in a randomized complete block design with three replications. Volatilization losses samplings were recorded on day one, three, six and nine after the first fertilization, and the second sampling was carried out in the same sequence from the second day after the second fertilization. An analysis of variance and mean separation were performed by less significant differences of Fisher 95 % using professional InfoStat 2009 programm. Volatilization losses are higher when urea is applied on the soil surface (57.68 kg N ha-1), reaching a cumulative loss of 43.37 %. Yields was statistically similar among the sources of nitrogen evaluated.

Palavras-chave : nitrogen dynamics; nitrogen fertilization; ammonium sulfate; urea; sorghum.

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