Penetration resistance, tangential shear strength, bulk density and temperature in a soil planted with coffee, Juan Viñas, Costa Rica
Bulk density, tangential shear strength, resistance to penetration (with two types of penetrometer), gravimetric moisture and temperature at the surface and 15 cm deep, were determined in a soil planted with coffee. Three points were georeferenced inside a 0.4 ha lot in a Dystrudept located in Juan...
| Autores: | , , , , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2010 |
| País: | Costa Rica |
| Recursos: | Universidad de Costa Rica |
| Repositório: | Portal de Revistas UCR |
| Idioma: | espanhol |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/6693 |
| Acesso em linha: | https://revistas.ucr.ac.cr/index.php/agrocost/article/view/6693 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Propiedades físicas del suelo compactación densidad penetrabilidad Physical soil properties compaction density penetrability |
| Resumo: | Bulk density, tangential shear strength, resistance to penetration (with two types of penetrometer), gravimetric moisture and temperature at the surface and 15 cm deep, were determined in a soil planted with coffee. Three points were georeferenced inside a 0.4 ha lot in a Dystrudept located in Juan Viñas, Costa Rica. By comparing the 2 depths, significant differences were found only for the variables resistance to penetration (1.60 and 0.73 MPa with the penetrometer “Chatillon”; and 0.30 and 0.15 MPa with the penetrometer “Soil Test” ) and gravimetric moisture content (30.37 and 42.08%, respectively). Although higher values were also found on the surface for both the tangential shear strength (0.028 and 0.025 MPa) and for bulk density (0.98 and 0.93 Mg.m-3 respectively), these differences were not significant. The values of resistance to penetration of both types of penetrometer correlated positively with each other (0.65**). Bulk density and penetration resistance measured with the device “Chatillon” kept a positive correlation (0.41+), which agrees with the fact that both variables are used to diagnose compaction problems. There was also a negative correlation between penetration resistance and moisture content (-0.68**) and a positive correlation between the latter variable and temperature (0.41+). Based on the results of this study, it could be verified that the surface had a higher compaction that the 15 cm-depth, which can be related to the frequent human traffic on the plantation, as a result of farming practices carried out in the crop, and also because of the lower soil humidity values found there. |
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