Abstract

RINCON CASTILLO, Alvaro; LIGARRETO MORENO, Gustavo Adolfo  and  GARAY, Edwin. FORAGE PRODUCTION IN THE GRASSES Brachiaria decumbens cv. AMARGO AND Brachiaria brizantha cv. TOLEDO SUBJECTED TO THREE FREQUENCIES AND TWO OF DEFOLIATION INTENSITIES UNDER CONDITIONS OF COLOMBIAN PLAIN PIEDMONT. Rev. Fac. Nac. Agron. Medellín [online]. 2008, vol.61, n.1, pp.4336-4346. ISSN 0304-2847.

In an oxisol of colombian plain piedmont was made the experiment. During the first year of establishment and with an experimental design of complete blocks at random in split-plot arrangement, the grasses B. decumbens cv. Amargo and B. brizantha cv. Toledo were evaluated under three defoliation frequencies (14, 28 and 42 days) and two defoliation intensities. The leaf area and total available biomass didn't present significant differences in the two grasses, being obtained to an average of 2,5 and 2.036 kg MSxha^-1 respectively. Total residual biomass was greater in Toledo grass because with 3.284 kg MSx ha^-1, it overcame the pasto Amargo whose accumulation of residual biomass was of 1.944 kg MSxha^-1. The intensity of low defoliation favored the production of available and residual forage of evaluated grasses. An available forage of 2.056 kg MSxha^-1 was presented in the low intensity and 1.760 kg MSxha^{- 1 in the high intensity. The compound residual forage in its majority for stems was of 2.860 kg MSxha- 1 in the low intensity and of 2.216 kg MSxha- 1 in the high intensity. When defoliation was carried out to the 14 days, grasses presented good protein content (12,9%) but the availability of biomass was low ( 714 kg MSxha-1}), whereas, to 42 days it reaches to 2.760 kg MSxha^-1 with a protein of 9,8%. The reserve nutrients in the two grasses were conformed by soluble sugars in their majority, which were accumulated in more quantity in stems and the highest content was found to 28 days of regrow.

Keywords : Grasses; forage; yield; defoliation; intensity; frequency; biomass; reserve nutrients.

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