TY - JOUR
T1 - Leaching Methods Can Underestimate Mineralization Potential of Soils
AU - Mulvaney, Richard L.
AU - Otto, Rafael
AU - Griesheim, Kelsey L.
AU - Su, Kai
AU - Trivelin, Paulo Cesar Ocheuze
N1 - Publisher Copyright:
© 2016 Taylor & Francis.
PY - 2016/8/5
Y1 - 2016/8/5
N2 - Aerobic incubations to estimate net nitrogen (N) mineralization typically involve periodic leaching of soil with 0.01 M calcium chloride (CaCl2), so as to remove mineral N that would otherwise be subject to immobilization. A study was conducted to evaluate the accuracy of leaching for analysis of exchangeable ammonium (NH4 +)-N and nitrate + nitrite (NO3 −+ NO2 –)-N, relative to conventional extractions using 2 M potassium chloride (KCl). Ten air-dried soils were used, five each from Illinois and Brazil, that had been amended with NH4 +-N (1 g kg−1) and NO3 –-N (0.6 g kg−1). Both methods were in good agreement for inorganic N analysis of the Brazilian Oxisols, whereas leaching was significantly lower by 12–48% in recovering exchangeable NH4 +-N from Illinois Alfisols, Mollisols, and Histosols. The potential for underestimating net N mineralization was confirmed by a 12-wk incubation experiment showing 9–86% of mineral N recoveries from three temperate soils as exchangeable NH4 +.
AB - Aerobic incubations to estimate net nitrogen (N) mineralization typically involve periodic leaching of soil with 0.01 M calcium chloride (CaCl2), so as to remove mineral N that would otherwise be subject to immobilization. A study was conducted to evaluate the accuracy of leaching for analysis of exchangeable ammonium (NH4 +)-N and nitrate + nitrite (NO3 −+ NO2 –)-N, relative to conventional extractions using 2 M potassium chloride (KCl). Ten air-dried soils were used, five each from Illinois and Brazil, that had been amended with NH4 +-N (1 g kg−1) and NO3 –-N (0.6 g kg−1). Both methods were in good agreement for inorganic N analysis of the Brazilian Oxisols, whereas leaching was significantly lower by 12–48% in recovering exchangeable NH4 +-N from Illinois Alfisols, Mollisols, and Histosols. The potential for underestimating net N mineralization was confirmed by a 12-wk incubation experiment showing 9–86% of mineral N recoveries from three temperate soils as exchangeable NH4 +.
KW - Biological N availability index
KW - N fertilizer requirement
KW - mineral N production
KW - net mineralization
KW - soil incubation
UR - https://www.scopus.com/pages/publications/84986237900
UR - https://www.scopus.com/pages/publications/84986237900#tab=citedBy
U2 - 10.1080/00103624.2016.1206561
DO - 10.1080/00103624.2016.1206561
M3 - Article
AN - SCOPUS:84986237900
SN - 0010-3624
VL - 47
SP - 1701
EP - 1708
JO - Communications in Soil Science and Plant Analysis
JF - Communications in Soil Science and Plant Analysis
IS - 13-14
ER -