Resumo

GUTIERREZ-PENA, Rául; ALONZO-GRIFFITH, Luis Alberto  e  RASCHE-ALVAREZ, Jimmy Walter. Sources and doses of nitrogenated fertilizers in corn cultivation for silage. Rev. ciente. UCSA [online]. 2022, vol.9, n.3, pp.59-71. ISSN 2409-8752.  https://doi.org/10.18004/ucsa/2409-8752/2022.009.03.059.

Corn is the second item in Paraguay in planting area and is the crop that requires the most demand for N, mainly through chemical fertilization. With the objective of evaluating two sources of nitrogenous fertilizer, as well as their increasing dose on the production of corn for silage, an experiment was carried out in a randomized complete block design, with a bifactorial arrangement, two sources of N (urea and sulfate of ammonium) and 6 doses of N (0, 40, 80, 120, 160 and 200 kg ha-1) and four repetitions. The variables evaluated were plant height (AP), green matter production (PMV), dry matter content (%DM), dry matter production (PMS), crude protein (CP), neutral detergent fiber (FDN) and fiber acid detergent (FDA). Data were submitted to ANOVA and when there was a significant response, means were compared using Tukey's test at 5% probability of error between sources and regression curve between doses. The AP was influenced by the N source, but not the PMV, %DM and PMS, however, with the exception of %DM, all the other variables responded to the N dose, adjusting to linear equations, without reaching the production peak. The CP presented an interaction between factors, adjusting to quadratic equations, decreasing the percentage of protein when applying high doses of N. The NDF was higher when N was applied in the form of urea, however, it was not affected by the dose of N. FDA presented an interaction between the factors, it decreased with increasing doses of urea, however, it did not vary with the application of ammonium sulfate. The source of N influences the bromatological composition, the dose of N influences the quantity and quality of the corn.

Palavras-chave : bromatological composition; urea; ammonium sulfate.

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