| Revista: | Ciencia rural |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000276658 |
| ISSN: | 0103-8478 |
| Autores: | Silva, Vanderlei Rodrigues da1 Reinert, Dalvan Jose1 Reichert, Jose Miguel2 |
| Instituciones: | 1Universidade Federal de Santa Maria, Centro de Ciencias Rurais, Santa Maria, Rio Grande do Sul. Brasil 2Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul. Brasil |
| Año: | 2000 |
| Periodo: | Sep-Oct |
| Volumen: | 30 |
| Número: | 5 |
| Paginación: | 795-801 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental |
| Resumen en inglés | The increase of soil mechanical resistance may limit plant growth and productivity. The objective of this paper was to evaluate the effects of wheel traffic caused by a grain harvester (combine) on penetration resistance for two soil tillage systems. The treatments were: no tillage, no wheel traffic and wheel traffic by a soybean harvester; tillage, no wheel traffic and at wheel traffic by a soybean harvester. Soil penetration resistance with a cone penetrograph with electronic readings for each 0.15cm depth, and soil moisture were determined down to a depth of the 40cm, at two soil conditions (dry and wet), on a clayey Haplortox (LE). The combine front-axle load was 5.0Mg and the wheel contact area was 0.283m², yielding a ground pressure of 0.0884MPa. For high soil moisture the soil resistance difference between treatments was low (smaller than 2,0MPa), not limiting to root growth. However, for the second evaluation, about 30 days after the first, when the soil was drier, soil compaction in the layer from 5 to 17cm caused by wheel traffic was observed. Soil water content influenced the values of soil resistance. Critical values, considered as penetration resistance greater than 2MPa, were mainly observed for the no tillage system, specially for the 7.5 to 17.0cm layer. The no tillage system had a greater state of compaction than the tilled soil, because of yearly load accumulations. Soybean yield was not different between the tillage systems, with an average of 3.15Mg ha-1 yield |
| Resumen en portugués | resistência mecânica à penetração considerados como críticos ao desenvolvimento das plantas (maiores que 2,0MPa) foram observados, principalmente, para o sistema de plantio direto. Os maiores valores de resistência à penetração foram encontrados no sistema de plantio direto que apresentou maior estado de compactação na camada de 7,5 a 17,0cm. O sistema de plantio direto possui um estado de compactação mais elevado, causado pelo acúmulo de pressões mecânicas a que o solo é submetido anualmente. Entretanto, a produtividade da cultura da soja não diferiu entre os sistemas de manejo do solo, permanecendo em torno de 3,15Mg ha-1 |
| Disciplinas: | Agrociencias |
| Palabras clave: | Fitotecnia, Suelos, Compactación del suelo, Siembra directa, Humedad del suelo, Rendimiento, Soya, Maquinaria agrícola |
| Keyword: | Agricultural sciences, Crop husbandry, Soils, Soil compaction, Direct sowing, Soil moisture, Yield, Soybean, Agricultural machinery |
| Texto completo: | Texto completo (Ver HTML) |
