Fisiologia Vegetal Taiz Volumen 1

The interaction between IBA and NAA for greater rooting response was significant only in nodal segments (Table 1), evidenced by the higher number of roots in the substrate with 20 mg.L-1 of NAA and 100 mg.

The significant higher number of nodal segments and micro-cuttingstransplanted in the substrate with IBA at 100 and 200 mg.L-1 in comparison to the 0 mg.L-1 (Table 1) demonstrates that this concentration significantly increased the rooting response. There is no record of effects of these hormones in some plant species such as Brassica species (Ayon et al., 1999; Sato et al., 2003), but there is a relative high number of studies related to IBA for the establishment of legumes such as Pisum arvenosum (Agyrone et al., 2003) and Medicago sativa (Nadarajah and Raju, 2005) when cultured in soil in inoculated substrates.

From the performance analysis among the explants types (nodal segments and micro-cuttings) and the N-K concentration, it was observed that the concentrations of 100 and 200 mg.L-1 significantly increased the chlorophyll content in nodal segments. However, these concentrations did not occur in the micro-cuttings and nodal segment explants cultured with N-K 200 mg.L-1 (Table 2). Analyzing the N-K interaction, the significant increase inthe chlorophyll content was not observed among the explants cultured with 20 and100 mg.L-1 in both explant types. This experimental design is similar to the most common farmingpractices, where the combined fertilization of both nutrients is used to increase forage production and quality (Camembert, 2002; Ostrander et al., 2004; Lopes da Silva et al., 2011).

Forage products are essential to feed cattle and be used as animal feed. They are passed to dairy and beef cattle. Pasture grasses are the major component of forage in the cattle diets, the most important species being Deenias scarparia, Sida acuta, Hortonia coracoides, and Matocephala platycarpa (Taiz & Zeiger, 2013). 7211a4ac4a