Efectos del componente arbóreo (Gliricidia sepium y Erythrina berteroana) sobre características físicas, químicas y biológicas del suelo bajo un sistema silvopastoril asociado a Brachiaria brizantha CIAT 26110 CV. Toledo en la zona húmeda baja de Costa Rica
2011
Instituto Tecnológico de Costa Rica. Escuela de Agronomía. ICE.
5402-2151-8201
Silvopastoral systems, including the proper use of tree species, especially the family
Leguminaceae as enabling elements of an integrated system (grass-tree-animal), where
trees trigger the cycling and pump of nutrients in the soil, add organic matter and can
improve forage production and species population of macro-and micro-organisms
involved in the dynamics of nutrient cycling, are considered as an alternative for the
sustainable development of tropical farming systems. This work was conducted in order
to evaluate some physicochemical characteristics in the soil, the earthworm population
density, production and nutritional value of forage produced where three production
systems were evaluated T1 (Gliricidia sepium associated Brachiaria brizantha CV
Toledo CIAT 26110), T2 (Erythrina berteroana associated with Brachiaria brizantha CV
Toledo CIAT 26110) and T3 (Brachiaria brizantha CV Toledo brizantha CIAT 26110 as a
monoculture). The research was developed in the farm of Mr. Ronald Meléndez, located
in Los Angeles, San Isidro district, Canton of San Ramon, Alajuela Province.
Under the conditions this work was developed, no differences were found in the soil for
pH values (5.53, 5.50 and 5.60 for T1, T2 and T3, respectively), however, differences
were found for the percentage of organic matter (1.23, 1.70 and 1.20, for T1, T2 and T3,
respectively) and the number of worms in the soil (215, 314 and 263 m2
worms, for T1,
T2 and T3 respectively). With respect to dry matter production of Brachiaria brizantha,
no differences were found among treatments, being the production statistically similar in
any of the systems studied (average 33 t ha-1 yr-1 in cuts every 30 days). Biomass
production of tree components was evaluated only in Erythrina berteroana as Gliricidia
sepium did not survive the system. The biomass production was berteroana Erythrina
2724 kg DM ha-1 yr-1 with cuts every six months. For the nutritional value of forage
component of Brachiaria brizantha, no significant differences between treatments
(average of 10.40% CP, 33% FAD, 56% NDF).
Changes are evident when comparing the values of soil organic matter, earthworm
population density and total biomass production (grasses and trees) obtained at the end
of the experimental period versus what was reported before establishing the treatments.
It confirms a large increase of these variables, so it can be concluded in general that the
change of land use under a monoculture pasture grass Ratana (Ischaemun indicum)
silvopastoral systems (Erythrina berteroana - Brachiaria brizantha; Gliricidia sepium -
Brachiaria brizantha) and / or improved pasture (Brachiaria brizantha) represents a very
positive change to improve the production of biomass and some physical and chemical
conditions of the soil.
Instituto Tecnológico de Costa Rica
Lidia Gómez
Cartago - 300m Este del Estadio Fello Meza. Apartado 159-7050.
2550-2263, 2550-2365