Lack of large sized suitable demonstration trials has prevented the adoption of improved pasture establishment technology at farm level in Ucayali. The aim of this experiment was to demonstrate the benefits of the mechanized pasture seeding and, particularly, the need for P fertilization and chemical weed control. The effect of three establishment treatments were evaluated using commercial size land areas. The treatments were: (A) conventional mechanized establishment, (B) conventional mechanized establishment plus P fertilization and (C) conventional mechanized establishment plus P fertilization plus chemical weed control, on seedling emergence, height and cover growth and dry biomass accumulation of a Brachiaria brizantha - Centrosema macrocarpum pasture. Unexpectedly, the effects of P fertilization and control weed with glyphosate were non significant, yet, in some cases, treatment (C...

La tecnología de establecimiento de pasturas en Ucayali no ha sido adecuadamente transferida, debido en parte a la ausencia de ensayos demostrativos de tamaño comercial. Con el objetivo de demostrar el potencial de la siembra mecanizada y la necesidad de la fertilización con P y el control de malezas, se estimó el efecto de los tratamientos (A) establecimiento mecanizado convencional, (B) establecimiento mecanizado más fertilización con P y (C) establecimiento mecanizado más fertilización con P y control de malezas con glyphosato, sobre la velocidad de emergencia de las plántulas, crecimiento en altura y cobertura y acumulación de biomasa seca de una pastura asociada de Brachiaria brizantha con Centrosema macrocarpum a escala comercial. Contrariamente a lo esperado, los efectos de la fertilización con P y la aplicación de herbicida sobre la emergencia, el crecimiento y la acu...

The purpose of this study was to evaluate the yield of dry matter (DM), crude protein (CP) and in vitro digestibility of dry matter (IVDMD) at four cutting heights and five maturity times of Pennisetum sp (Maralfalfa) during the periods of greatest and least precipitation in Pucallpa, Peru. Cuts were made at 0, 10, 20 and 30 cm height from the ground at 28, 35, 42, 49 and 56 days of regrowth. Plant height, number of stems, number, length and width of leaves, DM, CP and IVDMD yield were evaluated under a complete randomized design with a 4x5 factorial arrangement and 4 repetitions. The plant reached 120.5 cm in height at 56 days of regrowth. At the beginning of the growth period, it had 28 stems and 127 leaves, decreasing until it was established on 15 stems and 58 leaves after 56 days. In that same period the leaves grow up to 77.9 cm long and 2.3 cm wide. The DM performance increases wh...