Thiago Moisés Costa Pereira
Abstract:
Aimed to evaluate the effect of potassium doses on dry matter (DM) production, neutral detergent fiber (FDN) content, crude protein (PB) and nutrient concentration (P, K, Ca, Mg, S, Cu)., Mn, Fe and Zn) in two forage grass cultivars of the Panicum genus and two of the Cynodon genus. The experiments were conducted in a randomized block design with four replications in a two-factor factorial scheme under study, with potassium rates constant for both experiments and equivalent to 0, 40, 80, 120, 160 kg ha-1 K2O, and forage grass cultivars divided into two experimental groups, the first composed by mombaça and tanzania (genus Panicum) and the second by florakirk and florona (genus Cynodon). Two cuts were made for forage collection during the experimental phase. The forages sampled were analyzed by obtaining the data of dry mass production, FDN content, crude protein content and nutrient concentration. The results showed that potassium fertilization under the conditions of the study did not generate significant responses in MS production. Within the dosages used, the inclusion of higher doses of K did not affect the quality (FDN and PB) of forage. Increasing doses of potassium promoted a linear increase in K concentration in florakirk, florona and tanzania forage. In addition, they promoted an increase in Mn concentration in florakirk and florona. For Tanzania, this increase in Mn concentration was up to 120 kg of K2O ha-1. The increasing potassium doses were also responsible for the decrease of Ca concentration in Panicum cultivars.
