Abstract

LUGO SOTO, Maria et al. Effect of height and frequency cutting on production of dry matter and crude protein of Tithonia diversifolia (Hemsl) A. Gray. Zootecnia Trop. [online]. 2012, vol.30, n.4, pp.369-382. ISSN 0798-7269.

In order to evaluate the effect of height and frequency of cutting on dry matter production and crude protein Tithonia diversifolia, an trial was carried in the Campo Experimental Ciudad Bolivia the Instituto Nacional de Investigaciones Agrícolas (INIA) located in Ciudad Bolivia, Barinas state a 08º 22` N and 70º 36´ and 186 m.a.s.l. A completely randomized blocks design was used, with three replications in a factorial split plot treatments arrangement. In the main plot, heights of cutting (20 and 50 cm) were randomized and in the secondary plots the frequencies of cutting (30, 60 and 85 days). The variable: dry matter total (TDM), dry matter of edible (MSC) that resulted from the addition of dry matter of leaves (MSH) and dry matter of fresh stems with diameter <6mm (MCP), thick stems dry matter with diameter> 6mm (MSNC), the proportion of leaf and stem components and crude protein (CP) were evaluated. The MST, MSC and MSNC significant differences (P<0.05) only for the frequency of cutting, the highest production was obtained for 85 days, with values of 2.58, 0.53 and 2, 05 kg/ plant, respectively. The ratio of leaf: tender stems: 18:3:78 thick stems, both up to the frequency of cutting, during evaluations. The crude protein was affected (P<0.05) by the height and of cutting, with average values of 24.16% for 20 cm and 26.35% for 30 days. We conclude that with of 85 days you get the highest dry matter production and protein crude of 19.77%.

Keywords : Tithonia diversifolia; dry matter yield; crude protein; forage legume; height of cutting; frequency of cutting.

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