| Revista: | Revista brasileira de ciencia do solo |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000314797 |
| ISSN: | 0100-0683 |
| Autors: | Leite, Gabriel Henrique Melo Nascimento1 Eltz, Flavio Luiz Foletto1 Amado, Telmo Jorge Carneiro Cogo, Neroli Pedro2 |
| Institucions: | 1Universidade Federal de Santa Maria, Departamento de Solos, Santa Maria, Rio Grande do Sul. Brasil 2Universidade Federal do Rio Grande do Sul, Departamento de Solos, Porto Alegre, Rio Grande do Sul. Brasil |
| Any: | 2006 |
| Període: | Jul-Ago |
| Volum: | 30 |
| Número: | 4 |
| Paginació: | 685-693 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | In Rio Grande do Sul state, the area cultivated with under no-till system now amounts to 60 % of the total rain-fed cultivated area. However, there are still doubts as to crop practices in this soil conservation system, such as liming and fertilization as well as regarding root growth and crop productivity. The objective of this study was to evaluate the effects of lime doses and application forms on corn root development. The experiment was carried out in 1999/2000, in the experimental area of the Soil Science Department of the Federal University of Santa Maria, state of Rio Grande do Sul, Brazil, in a random block design in split plots, with four replications. The soil under study was a typical Hapludalf with 2 % slope. Main treatments were: no lime (SC), incorporation of 100 % of the recommended dose (100I), and 25 % (25S), 50 % (50S) and 100 % (100S) of the recommended dose (6.8 t ha-1) distributed over the soil surface. Lime was incorporated with conventional tillage in February 1996. Using the "nail board" method, with dimensions of 0,20 x 0,30 m, 0,30 x 0,45 m and 0,45 x 0,70 m, monoliths were taken from the soil profile, parallel to the corn sowing furrow, at 20, 54 and 80 days after corn emergence (DAE). The monoliths were carefully washed and the roots counted to establish a corn rooting profile in each treatment. Increasing lime doses applied on the soil surface (25S, 50S and 100S) increased the depth at which elevations in pH, Ca2+ and Mg2+ concentration and Al3+ reduction were observed. In the treatment 100I there was an increase in pH, Ca2+ and Mg2+ and a decrease in the Al3+ concentration down to 0,20-0,30 m compared to the SC treatment. Even under adverse acid conditions, the root profile showed there was root development down to 0,45 m in all treatments. Treatment 100I showed greater root development down to a depth of 0,15-0,20 m than treatments with lower surface lime doses (50s and 25S), where roots were more concentrated down to |
| Disciplines | Agrociencias |
| Paraules clau: | Fertilización, Suelos, Maíz, Zea mays, Encalado, Propiedades químicas, Labranza cero, Rendimiento, Sistema radicular |
| Keyword: | Agricultural sciences, Fertilization, Soils, Corn, Zea mays, Liming, Chemical properties, No tillage, Yield, Root system |
| Text complet: | Texto completo (Ver HTML) |
