Effect of Continuous Agriculture of Grassland Soils of the Argentine Rolling Pampa on Soil Organic Carbon and Nitrogen

Table 1

Description of study sites used for the validation model during T and NT periods.

Soil series	Symbol	Soil type	Agriculture time	Slope	Sampling date	Location	Fait
			years	%	year
T period
Pergamino	Pe	Typic Argiudoll	0	<1.0	1990	34°10′S∣60°40′W	Calibration/validation
Correa	Cr	Typic Argiudoll	0	<1.0	1990	32°49′S∣61°20′W	Validation
Urquiza	Ur	Typic Argiudoll	0	<1.0	1990	33°55′S∣60°25′W	Validation
Rojas	Ro	Typic Argiudoll	2	<1.0	1990	33°56′S∣60°55′W	Validation
Peyrano	Py	Vertic Argiudoll	5	1.5–3	1990	33°31′S∣60°25′W	Validation
Rojas 5	Ro5	Typic Argiudoll	8	<1.0	1990	33°55′S∣60°50′W	Validation
Pergamino	Pe	Typic Argiudoll	10	<1.0	1990	33°57′51.35′′S∣60°34′39,34′′W	Calibration
Pergamino	Pe	Typic Argiudoll	13	<1.0	1993	33°57′51.35′′S∣60°34′39,34′′W	Calibration
Pergamino	Pe	Typic Argiudoll	23	<1.0	2004	33°57′51.35′′S∣60°34′39,34′′W	Calibration
Pergamino	Pe	Typic Argiudoll	27	<1.0	2008	33°57′51.35′′S∣60°34′39,34′′W	Calibration
Pergamino	Pe	Typic Argiudoll	31	<1.0	2010	33°57′51.35′′S∣60°34′39,34′′W	Calibration
Pergamino	Pe	Typic Argiudoll	33	<1.0	2012	33°57′51.35′′S∣60°34′39,34′′W	Calibration
Las gamas	LG	Aeric Argialboll	34	<1.0	1990	33°44′S∣60°48′W	Validation
Rojas	Ro	Typic Argiudoll	35	<1.0	1990	34°02′S∣60°47′W	Validation
Pergamino 6 o Peyrano 2x	Pe6 o Py2x	Typic Argiudoll	40	1.5–3	1990	33°39′S∣60°42′W	Validation
Villa Eloisa	Ve2	Typic Argiudoll	55	1.5–3	1990	33°00′S∣61°10′W	Validation
Las gamas	LG	Aeric Argialboll	60	<1.0	1990	33°45′S∣60°50′W	Validation
Arroyo dulce 2	AD2	Typic Argiudoll	64	<1.0	1990	34°08′S∣60°22′W	Validation
Arroyo dulce 2	AD2	Typic Argiudoll	70	<1.0	1990	34°15′S∣60°17′W	Validation
Urquiza	Ur	Typic Argiudoll	72	<1.0	1990	33°55′S∣60°25′W	Validation
Arrecifes 2	Ar2	Typic Argiudoll	72	1–1.5	1990	33°52′S∣60°17′W	Validation
Correa 1	Cr1	Typic Argiudoll	75	1–1.5	1990	32°49′S∣61°20′W	Validation
Pergamino	Pe	Typic Argiudoll	80	<1.0	1990	33°46′S∣60°38′W	Calibration/validation
Rojas 4	Ro4	Typic Argiudoll	80	1–1.5	1990	34°14′S∣60°35′W	Validation
Arroyo dulce 2	AD2	Typic Argiudoll	83	<1.0	1990	34°10′S∣60°30′W	Validation
Peyrano	Py	Vertic Argiudoll	84	<1.0	1990	33°22′S∣60°47′W	Validation
Peyrano 1 o Peyrano 2x	Py1 ó Py2x	Vertic Argiudoll	87	1–1.5	1990	33°32′S∣60°46′W	Validation
Pergamino	Pe	Typic Argiudoll	100	<1.0	2010	33°46′S∣60°38′W	Calibration
Pergamino	Pe	Typic Argiudoll	102	<1.0	2012	33°46′S∣60°38′W	Calibration
Peyrano 2x	Py2x	Vertic Argiudoll	112	1.5–3	1990	33°35′S∣60°48′W	Validation
Casilda 1	Ca1	Vertic Argiudoll	113	1–1.5	1990	33°07′S∣61°20′W	Validation
NT period
Pergamino	Pe	Typic Argiudoll	0	<0.3	1979	33°57′36,26′′S∣60°33′50,25′′W	Validation
Pergamino	Pe	Typic Argiudoll	0	<0.3	1987	33°57′32,06′′S∣60°33′41,58′′W	Validation
Pergamino	Pe	Typic Argiudoll	0	<0.3	1987	33°57′31,54′′S∣60°33′44,85′′W	Validation
Pergamino	Pe	Typic Argiudoll	17	<0.3	2004	33°57′32,06′′S∣60°33′41,58′′W	Validation
Pergamino	Pe	Typic Argiudoll	17	<0.3	2004	33°57′31,54′′S∣60°33′44,85′′W	Validation
Pergamino	Pe	Typic Argiudoll	21	<0.3	2008	33°57′32,06′′S∣60°33′41,58′′W	Validation
Pergamino	Pe	Typic Argiudoll	21	<0.3	2008	33°57′31,54′′S∣60°33′44,85′′W	Validation
Pergamino	Pe	Typic Argiudoll	25	<0.3	2004	33°57′36,26′′S∣60°33′50,25′′W	Validation
Pergamino	Pe	Typic Argiudoll	25	<0.3	2012	33°57′32,06′′S∣60°33′41,58′′W	Validation
Pergamino	Pe	Typic Argiudoll	25	<0.3	2012	33°57′31,54′′S∣60°33′44,85′′W	Validation
Pergamino	Pe	Typic Argiudoll	29	<0.3	2008	33°57′36,26′′S∣60°33′50,25′′W	Validation
Pergamino	Pe	Typic Argiudoll	33	<0.3	2012	33°57′36,26′′S∣60°33′50,25′′W	Validation

T: tillage; NT: no tillage.