<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Puerto Martín, A</style></author><author><style face="normal" font="default" size="100%">Puerto, A</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">FITOMASA SUBTERRÁNEA Y AÉREA EN PASTOS DE DEHESA</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">España</style></keyword><keyword><style  face="normal" font="default" size="100%">fitomasa</style></keyword><keyword><style  face="normal" font="default" size="100%">Grasslands</style></keyword><keyword><style  face="normal" font="default" size="100%">influencia del arbolado</style></keyword><keyword><style  face="normal" font="default" size="100%">ladera</style></keyword><keyword><style  face="normal" font="default" size="100%">pastos</style></keyword><keyword><style  face="normal" font="default" size="100%">phytomass</style></keyword><keyword><style  face="normal" font="default" size="100%">Salamanca</style></keyword><keyword><style  face="normal" font="default" size="100%">Salamanca (Spain)</style></keyword><keyword><style  face="normal" font="default" size="100%">slope</style></keyword><keyword><style  face="normal" font="default" size="100%">tree canopy ¡nfluence</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1992</style></year></dates><volume><style face="normal" font="default" size="100%">22</style></volume><pages><style face="normal" font="default" size="100%">3-19</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A study has been conducted on the spatial variations undergone by root biomass, aerial phytomass and the root/shoot ratio in grassland communities (dehesa systems). These variations are governed by the prevailing gradients: topographic and the effect of the tree canopy. The greatest biomass, both underground and aerial, and the lowest root/shoot ratio are usually found in the more fertile sites (deposition sector of slope) and shaded áreas (under the crowns of the trees), in contrast to the results of some researchs performed in cultures or at the laboratory. In the case of natural or semi-natural groupings of herba- ceous species in severe environments, the adaptive responses of each species appear to predomínate over any generalized type of response. Key</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Olea, L</style></author><author><style face="normal" font="default" size="100%">Verdasco, M P</style></author><author><style face="normal" font="default" size="100%">Paredes, J</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Características y producción de los pastos de las dehesas del SO de la Península Ibérica</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">fertilización</style></keyword><keyword><style  face="normal" font="default" size="100%">leguminosas anuales</style></keyword><keyword><style  face="normal" font="default" size="100%">mejora de pastos</style></keyword><keyword><style  face="normal" font="default" size="100%">pastos</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1990</style></year></dates><volume><style face="normal" font="default" size="100%">21</style></volume><pages><style face="normal" font="default" size="100%">131-156</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">La producción de los pastos naturales de zonas semiáridas del S. O. de la Península Ibérica (DEHESA) es limitada tanto en cantidad como en calidad, siendo sus valores medios anuales de 1.440 kg/ha de M. S. con 10,3 % de Vroteina Bruta (P. B.) y 55,2 % de Digestibilidad de la Materia Orgánica (D.M.O.). Cuando se mejoran los pastos, con fertilizaciones fosfóricas o con introducción de especies más fertilizaciones fosfóricas, las producciones aumentan llegando a alcanzar los 2.500 kg/ha de M.S., con 12,6 % de P.B. y 60,7 % de D.M.O. La calidad de los pastos mejorados, aun estando secos, y su gran producción de semillas permite aprovecharlos en verano, consiguiendo sistemas de producción que duplican, al menos, la carga ganadera</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">de Muslera Pardo, E</style></author><author><style face="normal" font="default" size="100%">Cruz Guzmán, E</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Algunas consideraciones sobre la explotación de la dehesa extremeña, su problemática y posibles soluciones</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Dehesa</style></keyword><keyword><style  face="normal" font="default" size="100%">ganado</style></keyword><keyword><style  face="normal" font="default" size="100%">manejo (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">pastoreo</style></keyword><keyword><style  face="normal" font="default" size="100%">pastos</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1980</style></year></dates><volume><style face="normal" font="default" size="100%">10</style></volume><pages><style face="normal" font="default" size="100%">71-86</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The dehesa is the most characteristic type of extensive livestock farm in the S.W. of Spain. The past and present productive situation of these farms are described in this paper. New demand trends in the last years require a great change in the structure of their different activities of animal production. For their development an ordenated plan of invest- ments is necessary, requiring also a long term financing. Methods of clearing and pasture improvement are emphasised as the better way to increase carrying capacity. Is concluded about the need of farm improvement as a whole, and the possible solutions to develop the dehesa área, through livestock development programs.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Olea, Leopoldo</style></author><author><style face="normal" font="default" size="100%">Gallardo, D</style></author><author><style face="normal" font="default" size="100%">Paredes, J</style></author><author><style face="normal" font="default" size="100%">Martínez, a</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Resultado de los estudios regionales de introducción y adaptación de especies y variedades pascícolas en zonas semiáridas del SW español</style></title><secondary-title><style face="normal" font="default" size="100%">Pastos</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">fertilización</style></keyword><keyword><style  face="normal" font="default" size="100%">pastos</style></keyword><keyword><style  face="normal" font="default" size="100%">persistencia</style></keyword><keyword><style  face="normal" font="default" size="100%">suelo (voyant)</style></keyword><keyword><style  face="normal" font="default" size="100%">variedades recomendadas</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1977</style></year></dates><volume><style face="normal" font="default" size="100%">7</style></volume><pages><style face="normal" font="default" size="100%">210-222</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Results from a series of triáis conducced in S.W. Spain between 1972-1976 using different species and varieties of grasses and legumes indicated the advantages from fertilizer applications in all the áreas studied with the exceptions of &quot;La Serena&quot; and &quot;Palomas-Hornachos&quot;. Soil deph was also a major factor determining the success of pasture establishment and subsequently persistence and production. The Australian subclover cultivare used in these triáis did not generally persist adequately. It is tberefore concluded that there is a need to select &quot;local&quot; ecotypes of this species and of others species that are more adapted to the environmental conditions of the zone. More information is also required on the environmental factors, managerial practicas and agro- nomic characteristics that contribute to persistence of annual legumes. It is believed that persistence is the major determinant of success in pasture improvement involving the use of annual legumes; with perennial grasses in S.W. Spain, establishment appears to be major determinant. 222</style></abstract></record></records></xml>