<?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%">GARCÍA CIUDAD, A.</style></author><author><style face="normal" font="default" size="100%">MORENO DOMÍNGUEZ, A.</style></author><author><style face="normal" font="default" size="100%">GARCÍA CRIADO, B.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Variación estacional de la composición mineral en pastizales 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%">composición mineral</style></keyword><keyword><style  face="normal" font="default" size="100%">Dehesa</style></keyword><keyword><style  face="normal" font="default" size="100%">pastizales</style></keyword><keyword><style  face="normal" font="default" size="100%">variación estacional (voyant)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1981</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1981///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://polired.upm.es/index.php/pastos/article/view/1575</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">11</style></volume><pages><style face="normal" font="default" size="100%">217 - 233</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The seasonal variations in the concentrations of sahes, N, P, K, Ca, Mg, Na, Fe, Mn, Cu and Zn in the pasture lands of a dehesas in the Pro- vince of Salamanca are studied. The sampling was monthly and took place during the period from September 1978 to October 1979. In general, the contení of ashes, N, P and K evolves in a similar ma- nner, reaching highest valúes in spring and lowest valúes in summer. Ho- wever, the concentrations of Ca, Mg and Mn show sharp oscilations at zone or fasture-type level. Those of Na, Cu and Zn are totally different from eteach other, but while in the Na concentration there are scarce fluc- tuations throughout the seasons, there are marked variations in the other tvvo. The elements Mg and Na are outstanding due to their relatively low concentrations which lie between 0 03 and 0.15% and 0.02 and 0.14% for the former and the latter, respectively. In the pasture land of the dehesa studied, it is usual to find deficien- cies in the elements Na, Cu and Zn throughout the year, while it is only in spring that the concentrations of N, P, Ca and Mg rise above the cri- tical levéis of an adequate nutrition for rumiants.</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue></record></records></xml>