Artículos de revistas
A rapid method for estimating labile carbon and nitrogen pools in Mollisols under no-tillage
Fecha
2017-12Registro en:
Martinez, Juan Manuel; Galantini, Juan Alberto; Duval, Matias Ezequiel; A rapid method for estimating labile carbon and nitrogen pools in Mollisols under no-tillage; Taylor & Francis; Archives of Agronomy and Soil Science; 12-2017; 1-7
0365-0340
1476-3567
CONICET Digital
CONICET
Autor
Martinez, Juan Manuel
Galantini, Juan Alberto
Duval, Matias Ezequiel
Resumen
The objective of this study was to adapt the partial chemical digestion method for estimation of labile soil organic matter pools by evaluating the effect of different digestion times in Mollisols of the Argentine Pampas. The soils were sampled from nine agricultural fields under no-tillage at the 0–20 cm depth. A chemical method was performed through partial soil digestion with dilute sulphuric acid at 100°C on the basis of four digestion times: 1 (Nd1), 2 (Nd2), 4 (Nd4) and 6 (Nd6) hours. Soil organic carbon (C) and nitrogen (N) fractions were determined. The extracted organic N (Nd) ranged from 0.076 g kg−1 to 0.273 g kg−1, with a mean of 0.154 g kg−1. Statistically, the means for each digestion time indicated highly significant differences (P = 0.008). High correlations were found between Nd for different times and labile C and N fractions. However, the best fit prediction was observed between Nd2 and soil total carbohydrates (CHt), with a high coefficient of determination (R2 = 0.94). Partial chemical digestion for 2 h can be used as a rapid indicator to accurately predict CHt. Because of its speed and simplicity, this method may also be useful for rapid soil quality assessments.