The species that can be used as cover plants are many, which makes it difficult to make a choice, since there is no ideal plant, and it is necessary to make a survey of the most favorable species. The objective of thi...The species that can be used as cover plants are many, which makes it difficult to make a choice, since there is no ideal plant, and it is necessary to make a survey of the most favorable species. The objective of this study was to evaluate the biomass productivity of cover crops in autumn and winter (Poaceaea and Fabaceae), and their effects on soil physical properties at different depths. The experimental design was of randomized blocks with subdivided plots, with six replications. The plots consisted of four cover crops in autumn and winter;two Poaceae (black oats and brachiaria) and two Fabaceae (fried pea and white lupine). The subplots were at different depths of evaluations;0 - 0.05;0.05 - 0.10 and 0.10 - 0.15 m to determine the pore volume and soil density;and 0 to 0.40 m to resistance to penetration. Were evaluated: dry mass yield;soil surface cover index;volume of macropores, micropores, total porosity;soil density;and soil resistance to penetration. It was verified that the family of plants Fabaceae showed higher dry matter yield (4400 kg·ha-1), however, the lower soil cover rate (68.71%). The highest volume of macropores (0.05 m3·m-3) and the lowest soil resistance to penetration were observed in the soil cultivated with Poaceae family cover plants, in the respective depths of 0 - 0.10 m and 0.05 - 0.20 m.展开更多
This study aimed to assess the population density of nematodes and mycorrhizal soil fungi, in areas cultivated with oats, brachiaria, forage and white lupine, as well as in maize and soybean crops in succession, in or...This study aimed to assess the population density of nematodes and mycorrhizal soil fungi, in areas cultivated with oats, brachiaria, forage and white lupine, as well as in maize and soybean crops in succession, in order to generate a microbiological indicator of soil quality. In order to assess nematode and arbuscular mycorrhizal fungi (AMF) population densities, the experiment was performed in two stages: the first assessment was performed in the area where different cover crops were planted, in five seasons (0, 60, 90, 120, 150 days after sowing—DAS). In the second stage, soybean and maize crops in succession were assessed. According to the results, free-living nematodes and arbuscular mycorrhizal fungi population densities were not affected by the cover crop species used and, therefore, these can be grown prior to soybean and corn crops, without impact to free-living nematodes and AMF. The largest population of saprophyte nematodes and AMF occurred at 90 days. The cultivation of soybean and corn did not influence the number of free-living nematodes, but influenced the number of arbuscular mycorrhizal fungi. The highest numbers of mycorrhizal fungi Gigaspora margarita and Glomus macrocarpum were found in maize.展开更多
文摘The species that can be used as cover plants are many, which makes it difficult to make a choice, since there is no ideal plant, and it is necessary to make a survey of the most favorable species. The objective of this study was to evaluate the biomass productivity of cover crops in autumn and winter (Poaceaea and Fabaceae), and their effects on soil physical properties at different depths. The experimental design was of randomized blocks with subdivided plots, with six replications. The plots consisted of four cover crops in autumn and winter;two Poaceae (black oats and brachiaria) and two Fabaceae (fried pea and white lupine). The subplots were at different depths of evaluations;0 - 0.05;0.05 - 0.10 and 0.10 - 0.15 m to determine the pore volume and soil density;and 0 to 0.40 m to resistance to penetration. Were evaluated: dry mass yield;soil surface cover index;volume of macropores, micropores, total porosity;soil density;and soil resistance to penetration. It was verified that the family of plants Fabaceae showed higher dry matter yield (4400 kg·ha-1), however, the lower soil cover rate (68.71%). The highest volume of macropores (0.05 m3·m-3) and the lowest soil resistance to penetration were observed in the soil cultivated with Poaceae family cover plants, in the respective depths of 0 - 0.10 m and 0.05 - 0.20 m.
文摘This study aimed to assess the population density of nematodes and mycorrhizal soil fungi, in areas cultivated with oats, brachiaria, forage and white lupine, as well as in maize and soybean crops in succession, in order to generate a microbiological indicator of soil quality. In order to assess nematode and arbuscular mycorrhizal fungi (AMF) population densities, the experiment was performed in two stages: the first assessment was performed in the area where different cover crops were planted, in five seasons (0, 60, 90, 120, 150 days after sowing—DAS). In the second stage, soybean and maize crops in succession were assessed. According to the results, free-living nematodes and arbuscular mycorrhizal fungi population densities were not affected by the cover crop species used and, therefore, these can be grown prior to soybean and corn crops, without impact to free-living nematodes and AMF. The largest population of saprophyte nematodes and AMF occurred at 90 days. The cultivation of soybean and corn did not influence the number of free-living nematodes, but influenced the number of arbuscular mycorrhizal fungi. The highest numbers of mycorrhizal fungi Gigaspora margarita and Glomus macrocarpum were found in maize.
