<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Townsend,  C.R.</style></author><author><style face="normal" font="default" size="100%">Costa, N.L.</style></author><author><style face="normal" font="default" size="100%">Magalhaes, J. A.</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">asb@cgiar.org</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Caracteristicas Quimicas De Solo Sob Pastagens Degradadas De Brachiaria Brizantha Cv Marandu.</style></title><secondary-title><style face="normal" font="default" size="100%">Pasturas Tropicales</style></secondary-title><translated-title><style face="normal" font="default" size="100%">Chemical Characteristics of Soil in degraded pastures of Brachiaria brizanthacv. Marandu.</style></translated-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">brizantha cv. Marandu</style></keyword><keyword><style  face="normal" font="default" size="100%">Fertilizer</style></keyword><keyword><style  face="normal" font="default" size="100%">Phosphorus</style></keyword><keyword><style  face="normal" font="default" size="100%">potassium</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2003</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://webapp.ciat.cgiar.org/forrajes/pdf/pasturas_tropicales_2003/pt_25_3_18_23.pdf</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">25</style></volume><pages><style face="normal" font="default" size="100%">18-23</style></pages><language><style face="normal" font="default" size="100%">Portuguese</style></language><abstract><style face="normal" font="default" size="100%">The effect of the application of lime and fertilizers (N, P, K) on the rehabilitation of a degraded pasture of Brachiaria brizantha cv. Marandu, grown on a dystrophic Yellow Latosol of clayey texture, was studied under field conditions at the Empresa Brasileira de Pesquisa Agropecuária (Embrapa-Rondônia) in Porto Velho, Brazil, over a 3-year period. A randomized block design was used, arranged in a 2 x 2 x 2 x 2 factorial for levels of liming (base saturation of 20% and 40%) and doses of nitrogen (50 and 100 kg N/ha as urea), phosphorus (50 and 100 kg P2O5/ha as triple superphosphate) and potassium (30 and 60 kg K2O /ha as potassium chloride) and in a 3 x 2 x 2 x 2 factorial for fertilization frequencies (annual, biennial, and triennial) and levels. The lime and fertilizers were applied after native vegetation was controlled and light plowing. Soil samples were taken at a depth of 0-15 cm and 15-30 cm to determine the effect of the treatments on soil physical properties. Cations and exchangeable Al decreased significantly, while soil pH and exchangeable
bases increased. At both depths, total P increased with the P doses applied fractionated every 2 years. When lime was applied to correct bases up to 20%, the best responses to P in samples taken between 0 and 15 cm were found when 60 kg K2O /ha were applied, which did not occur at 40% base saturation. Treatments did not affect K or OM contents. P content was only affected by frequency of application. Under these study conditions, it is recommended that lime be applied to increase base content to 40% and NPK fertilization rates of 100, 50, and 60 kg/ha at a minimum frequency of 2 years.</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue></record></records></xml>