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Available Nitrogen for Corn and Winter Cereal in Spanish Soils Measured by Electro‐ultrafiltration, Calcium Chloride, and Incubation Methods

AuthorsQuemada, Miguel; Díez López, José Antonio
KeywordsAerobic incubation
Available N CaCl2, EUF, N mineralization rate
N mineralization rate
Issue Date2007
PublisherTaylor & Francis
CitationCommunications in Soil Science and Plant Analysis, 38: 2061–2075, (2007)
AbstractComparison of methods is necessary to develop a quick and reliable test that can be used to determine soil-available nitrogen (N) in an attempt to increase the efficiency of N fertilizers and reduce losses. The objectives of this research were to compare the fractions extracted by the calcium chloride (CaCl2) and the electroultrafiltration (EUF) methods and to correlate them to the mineralization rate (k) obtained from a 112-d incubation of 61 soil samples. Thirty-five soil samples were collected from cornfields and 26 from winter cereal fields. Subsamples were either aerobically incubated to calculate k or extracted by the EUF and CaCl2 methods to identify three fractions: nitrate (NO3 2)-N, ammonium (NH4þ)-N, and Norg-N. The Norg-N extracted by both methods was larger in soils from cornfields than in soils from winter cereal fields. In samples from cornfields, the Norg-N fraction obtained by the EUF method was correlated to the Norg-N measured by the CaCl2 method (r ¼ 0.46). Soil N content was related to k in samples from cornfields (r ¼ 0.40) but not in samples from winter cereal fields. Also, k was correlated to inorganic N content extracted by both chemical methods. The CaCl2 method was a reliable alternative for laboratories to determine soil-available N for corn but not for winter cereal
Description15 páginas, 1 figura y 2 tablas estadísticas
Publisher version (URL)http://dx.doi.org/10.1080/00103620701548795
ISSN0010-3624 print/1532-2416 online
Appears in Collections:(ICA) Artículos
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