Adsorcao de nitrato em Latossolos sob vegetacao de cerrado
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Instituto Interamericano de Cooperación para la Agricultura (IICA)
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Adsorption of nitrate by nine oxisols collected in cerrados (savannah) from Brazil was measured in solutions containing graded amounts of KNO, Nitvate adsorp-tion for B-horizons varied from 0.11 mmol/100 g for soil suspensions of pH values ranging from 4.4 to 5.0. The amount adsorbed increased with decreasing pH. At given pH, adsorption was concentration-dependent in a manner consistent with the Langmuir equation
In soils with similar chemical and mineralogical compositions in the Ap and B horizons, the lower nitrate adsorption of the Ap horizons was attributed to the dif-ferences in the organic matter content
To determine the nitrate vemaining in the supernatant liquid, the nitrate elec-trode method and the spectrophotometric method using the ultraviolet range (200 mm) were used, which were checked against the phenoldisulfonic method.
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Suelo, Nitrato||nitrates||nitrato||nitrate, Ferralsol||Ferralsols||ferralsolo||ferralsol, Nitrato de potasio||potassium nitrate||nitrato de potássio||nitrate de potassium, Absorción||absorption||absorção||absorption, pH del suelo||soil pH||pH do solo||pH du sol, Materia orgánica del suelo||soil organic matter||matéria orgânica do solo||matière organique du sol, Experimentación en laboratorio||laboratory experimentation||experimentação em laboratório||expérimentation en laboratoire, Técnica analítica||analytical methods||técnica analítica||technique analytique, Brasil||Brazil||Brasil||Brésil, Sede Central