2.2.2. Chilean Journal (Ex- Agricultura Técnica)
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Examinando 2.2.2. Chilean Journal (Ex- Agricultura Técnica) por Autor "Acuña P., Hernán"
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- [Contenido de taninos condensados en germoplasma de tres especies del género Lotus en diferentes ambientes]
Serie Documental: Chilean Journal of Agricultural Research
N° Documento: v. 68(1) p. 31-41
Los taninos condensados (TC) presentes en Lotus spp., dependiendo de su concentración en la planta, pueden evitar el meteorismo y favorecer la absorción de proteína en rumiantes. Con el objetivo de conocer la variabilidad de esta característica se determinó por el método del butanol-HCl la concentración (% base materia seca) de TC en 13 cultivares de Lotus corniculatus L. (Lc) introducidos de Norteamérica, Sudamérica y Oceanía, 11 accesiones de Lotus tenuis Waldst. y Kit. ex Willd. (Lt) y 22 accesiones de Lotus uliginosus Schkuhr. (Lu), colectadas en Chile entre los 32 grados y 38 grados lat. S, y 36 grados y 46 grados lat. S, respectivamente. Los experimentos, en un diseño de bloques completos al azar con dos repeticiones, fueron establecidos en otoño de 1998 en cinco diferentes ambientes en la zona centro sur de Chile (suelo arcilloso, suelo arenoso y tres suelos volcánicos con diferentes niveles de humedad disponible).Enlace permanente: https://hdl.handle.net/20.500.14001/36877
Acuña P., Hernán, Concha, Alex, Figueroa, Marcos , (Ene-Mar 2008) - Nitrogen, phosphorus, and potassium use efficiency for perennial ryegrass and white clover cultivar mixtures
Serie Documental: Chilean Journal of Agricultural Research
N° Publicación: v. 81(3) p. 456-466
The nutrient use efficiency of perennial ryegrass (Lolium perenne L.) (PR) and white clover (Trifolium repens L.) (WC) cultivars can affect the grass-legume compatibility of different cultivar combinations, thus impacting the sustainability of animal production systems, especially on marginal soils. The objective of this work was to evaluate N, P, and K absorption efficiency (NAE, PAE, and KAE) and use efficiency (NUE, PUE, and KUE). This study included two experiments with the same full factorial treatment structure (4 PR cultivars × 3 WC cultivars) in a randomized complete block design under field conditions and a completely randomized pot design. The field cutting experiment was carried out on sites with two contrasting soil depths and the pot experiment was conducted under shade conditions. Results showed nonsignificant (P > 0.05) factor interactions for DM yield and both nutrient absorption and use efficiency. The NAE and PAE of PR ‘Extreme’ and ‘Bealey’ were higher under field conditions than pot conditions. In the field experiment, NAE of WC ‘Will’ (2.33 kg DM ha-1/mg N kg-1) tended to be similar (P < 0.05) to other cultivars in deep soil, but was significantly higher (P < 0.001) than ‘Ladino’ and ‘Bounty’ in shallow soil (0.70 kg DM ha-1/mg kg-1). The evaluation of NUE and PUE under field conditions and KUE under pot conditions showed that PR ‘Bealey’ and WC ‘Ladino’ reached higher values. In conclusion, results showed a cultivar effect on nutrient use efficiency in PR/WC mixtures, which had an impact on PRWC compatibility, mainly due to the higher absorption efficiency of PR ‘Bealey’ and WC ‘Will’, both of which exhibited the highest degree of compatibility for total DM yield.Enlace permanente: https://hdl.handle.net/20.500.14001/68682
Sánchez, María Paulina, Acuña P., Hernán, Inostroza F., Luis, Zagal V., Erick , (2021-07)