<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>3</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Carmona, E</style></author><author><style face="normal" font="default" size="100%">Ordovas, J</style></author><author><style face="normal" font="default" size="100%">Ortega, M C</style></author><author><style face="normal" font="default" size="100%">Aguado, M T</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Roeber, RU</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Nitrogen availability in composted cork</style></title><secondary-title><style face="normal" font="default" size="100%">INTERNATIONAL SYMPOSIUM ON GROWING MEDIA AND PLANT NUTRITION IN HORTICULTURE</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Bark</style></keyword><keyword><style  face="normal" font="default" size="100%">growing media</style></keyword><keyword><style  face="normal" font="default" size="100%">N immobilization</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1997</style></year></dates><publisher><style face="normal" font="default" size="100%">INTERNATIONAL SOCIETY HORTICULTURAL SCIENCE</style></publisher><pub-location><style face="normal" font="default" size="100%">PO BOX 500, 3001 LEUVEN 1, BELGIUM</style></pub-location><pages><style face="normal" font="default" size="100%">349-352</style></pages><isbn><style face="normal" font="default" size="100%">90-6605-988-5</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Previous studies showed that plants grown in fresh cork (Quercus suber&lt;br/&gt;L. bark) had a reduced growth compared with peat and low rates of N. In&lt;br/&gt;composted cork, however, plant growth was similar with those in peat,&lt;br/&gt;but the N content of plants was still slightly lower.&lt;br/&gt;The purpose of this study was to investigate N availability in fresh and&lt;br/&gt;composted cork during 4, 5.5 and 7 months, using peat as control medium.&lt;br/&gt;The substrates were also incubated at 25 degrees C during 60 days after&lt;br/&gt;adding 0.25, 1.0, 1.75 or 3.0 g ammonium nitrate per 1 of substrate.&lt;br/&gt;Samples were taken periodically to measure NO3-N, NH4-N and total N.&lt;br/&gt;Also the Nitrogen Drawdown Index (NDI) for the addition of 75 mg.l(-1) N&lt;br/&gt;and 150 mg.l(-1) N was measured after incubation at 25 degrees C.&lt;br/&gt;N immobilization rates were well correlated to NDI. NH and soluble N&lt;br/&gt;drawed down rapidly in cork substrates while total N stayed constant.&lt;br/&gt;High rates of ammonium nitrate should be added to maintain a constant&lt;br/&gt;level of available N to plants in cork.</style></abstract></record></records></xml>