Adubação nitrogenada em Tifton 85 (Cynodon spp.) na região de Monte Carmelo-MG

Abstract

The general objective of this work was to evaluate the vegetative development of Cynodon spp. cultivated at the beginning of the rainy season, in a cerrado soil (Alto Paranaíba / MG), with different doses of urea (N), applied through irrigation with fixed water depth for all treatments, defining the best dose that provides maximum forage production. The experiment carried out in the UFU premises, Monte Carmelo campus, under a protected environment. The experimental design was completely randomized (DIC), with 5 treatments and 5 replicates, being 4 nitrogen doses and the control (control). The urea doses submitted in each vessel were 0kg ha-1, 100kg ha-1, 200kg ha-1, 300kg ha-1 e 400kg ha-1. Each plot is composed of 4 pots of fodder, each container having a capacity of 5 liters and a radius of 10 cm. Fertilization was carried out by fertigation, and the application time will occur after grazing (cut), where urea was diluted in water (CO (NH2) 2) adjusted for each treatment, considering that urea contains 45% nitrogen (N). The irrigations were carried out by means of manually water dosages in the pots, with a water meter. The green matter, dry matter, and forage root were evaluated. The final data were obtained from the statistical analysis with a significance level of 5%. After checking the significance of ANOVA, the Tukey test was used for multiple comparisons between the means of treatments, using SISVAR software. For the conditions of the experiment and due to the observed results, it is concluded that nitrogen fertilization provides green matter increase and dry matter in irrigated forages. The 200 kg ha-1 dose maximizes green and dry matter production of Cynodon spp. in Cerrados of the region of Alto Paranaíba of Minas Gerais. Regardless of the dose used, the use of nitrogen fertilization promoted increase of dry matter of roots of the forage Cynodon spp.