Pedotransfer functions to estimate proctor test parameters under different tillage systems

Revista Brasileira de Ciência do Solo

Carina Rosa Álvarez²  Federico Guillermo Micucci¹  Carolina Bustingorri²  Miguel Angel Taboada² 

[1] ,Universidad de Buenos Aires Facultad de Agronomía Cátedra de Fertilidad y FertilizantesBuenos Aires,Argentina

关键词: soil organic carbon;    soil compaction;    soil texture;    carbono orgânico do solo;    compactação do solo;    textura do solo;   

DOI  :  10.1590/S0100-06832010000600002

来源: SciELO

【 摘 要 】

The Proctor test is time-consuming and requires sampling of several kilograms of soil. Proctor test parameters were predicted in Mollisols, Entisols and Vertisols of the Pampean region of Argentina under different management systems. They were estimated from a minimum number of readily available soil properties (soil texture, total organic C) and management (training data set; n = 73). The results were used to generate a soil compaction susceptibility model, which was subsequently validated using a second group of independent data (test data set; n = 24). Soil maximum bulk density was estimated as follows: Maximum bulk density (Mg m-3) = 1.4756 - 0.00599 total organic C (g kg-1) + 0.0000275 sand (g kg-1) + 0.0539 management. Management was equal to 0 for uncropped and untilled soils and 1 for conventionally tilled soils. The established models predicted the Proctor test parameters reasonably well, based on readily available soil properties. Tillage systems induced changes in the maximum bulk density regardless of total organic matter content or soil texture. The lower maximum apparent bulk density values under no-tillage require a revision of the relative compaction thresholds for different no-tillage crops.

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