Production and Tillering of Mombaça Grass With Different Sources and Levels of Applied Nitrogen

Abstract

Nitrogen influences numerous physiological and morphological traits of forage grasses, which ultimately interfere directly with production and forage quality. Aimed to study was to evaluate the production of dry matter and the number of tillers of Panicum maximum cv. Mombaça grown with different sources and levels of applied nitrogen. The experiment was conducted at the Federal Institute of the Espírito Santo, Campus of Santa Teresa. The experimental design consisted of a randomised block design with three replicates in a 3 x 6 factorial design and three nitrogenous fertilizers (urea, ammonium sulphate and calcium nitrate), which were applied at six different levels (0, 120, 240, 360, 480 and 600 kg ha-1) during the experimental period, for a total of 54 experimental units. Nitrogen levels were divided into seven applications, and the treatments were applied every 28 days, always after the forage was cut. The results show that Mombaça grass is responsive to nitrogen fertilization, and the response in terms of dry matter production and number of tillers for the same level of nitrogen varies depending on the nitrogen source used. Of the nitrogen sources, calcium nitrate had the best performance for the variables evaluated here. For this nitrogen source, the production of dry matter achieved at the maximum level of nitrogen was 18% and 36% higher than the dry matter achieved with the use of ammonium sulphate and urea, respectively.

Morphological characteristics and production of Xaraes and Zuri grass fertilized with combinations of sulfur and potassium

“…Sulfur is essential for the synthesis of some proteins (PAIVA & NICODEMO, 1994) and, therefore, an increase in forage mass production (P<0.05) can be observed in the treatment with sulfur alone when compared to the control treatment (Table 2). Rosado et al (2016), evaluating nitrogen fertilization with three different sources (urea, ammonium sulfate and calcium nitrate), observed that Megathyrsus maximus cv. "Mombaça" obtained a response of 13.6% more in production when they used ammonium sulfate compared to the treatment that received urea.…”