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Aggregation agents and structural stability in soils with different texture and organic carbon contents Scientia Agricola
Carrizo,María Eugenia; Alesso,Carlos Agustín; Cosentino,Diego; Imhoff,Silvia.
The flat pampas in the state of Santa Fe in Argentina have soils with high silt content, variable carbon content, and diverse degrees of structural degradation. Aggregate stability has been used as an indicator of the structural condition of the soil. This study aimed to quantify the effect of the addition of crop residues and root activity on the agents of aggregation and mechanisms of aggregate breakdown in soils with different carbon contents and textures cultivated under no-till. An experimental trial was conducted on a loamy soil (Typic Hapludoll, Santa Isabel series) and a silty soil (Typic Argiudoll, Esperanza series) under controlled conditions for 112 days with the following treatments: (i) with and without wheat plant growth and (ii) with and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glomalin; Carbohydrates; Crop residues; Active roots.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000100075
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Estimating Sample Size of Soil Cone Index Profiles by Bootstrapping Rev. Bras. Ciênc. Solo
Alesso,Carlos Agustín; Masola,María Josefina; Carrizo,María Eugenia; Imhoff,Silvia Del Carmen.
ABSTRACT Measurements of the soil cone index are widely used to assess soil resistance to root penetration (SR) and to monitor the soil compaction status of agricultural fields. However, soil sampling for SR estimation is a rather challenging task in view of the high spatial and temporal variability of the soil. This study proposed a bootstrapping method to determine the minimum sample size required to estimate the vertical profile of mean soil cone index (CI) values at different levels of precision and confidence. For this purpose, CI data from a Typic Argiudoll under no-tillage before and after chiseling was used. A total of 151 CI profiles were recorded before and after chiseling in a 3,200 m2 (40 × 80 m) no-tillage area at sampling points distributed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sampling; Soil resistance; Bootstrap procedure; Soil variability.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100429
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