| Revista: | Revista brasileira de ciencia do solo |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000314827 |
| ISSN: | 0100-0683 |
| Autors: | Aita, Celso1 Port, Odair Giacomini, Sandro Jose |
| Institucions: | 1Universidade Federal de Santa Maria, Departamento de Solos, Santa Maria, Rio Grande do Sul. Brasil |
| Any: | 2006 |
| Període: | Sep-Oct |
| Volum: | 30 |
| Número: | 5 |
| Paginació: | 901-910 |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | The use of pig slurry before implanting cover crops in the fall/winter is becoming a common practice in southern Brazil, although its effects on crops and soil are still poorly investigated. The objective of the present study was to analyze the dynamics of soil N as well as to study the cover crop yields under use of pig slurry in the fall/winter. The study was developed in the growing season 2000 on an experimental area of the Soils Department of UFSM, RS. The experiment was set up in a randomized complete block design with split-plots and three replications. The main plots had black oat, black oat (30 %) + common vetch (70 %) mixture and spontaneous vegetation of the area (fallow). Four pig slurry rates (0, 20, 40 and 80 m³ ha-1) were applied on the split-plots. The mineral N contents (N-NH4+ and N-NO2- + N-NO3-) were evaluated at seven dates in the layers of 0-5, 5-15, 15-30 and 30-60 cm depth. The dry matter production and N, P and K concentration of cover crops and spontaneous vegetation were evaluated. Mineral soil N increased with liquid manure application, with similar N dynamics when applied on residues of oat/corn or on weeds/corn residues. After application of 80 m³ ha-1 there was evidence of N-NO3- leaching to depths below 60 cm, higher in weeds/corn system than oat/corn crop system. Dry matter production as well as the content of N, P and K in cover crops increased with the use of slurry. For single oat the increase of dry matter production with a slurry dose of 40 was 2.7 mg ha-1 compared to no-slurry treatment. In the oat + vetch mixture the increased slurry amount stimulated the development of oat in detriment of vetch and the dry matter production and N added were most in balance at a slurry rate of 20 m³ ha-1.This study demonstrates the efficiency of fall/winter cover crops in nutrient cycling trough application of pig slurry and shows the importance of using species with high dry matter production and N demand |
| Disciplines | Agrociencias, Biología |
| Paraules clau: | Suelos, Fisiología vegetal, Nitrógeno, Cobertura vegetal, Labranza cero, Fenología, Avena strigosa, Vicia sativa, Lixiviación |
| Keyword: | Agricultural sciences, Biology, Soils, Plant physiology, Nitrogen, Plant cover, Phenology, Avena strigosa, Vicia sativa, Lixiviation |
| Text complet: | Texto completo (Ver HTML) |
