期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Chemical Attributes of a Typic Acrudox Soil on Marandu Palisade Grass under Rotational Stocking, Liming and Nitrogen Fertilisation
1
作者 Valdinei T. Paulino Erika M. C. Teixeira +1 位作者 Keila M. R. Duarte Marcia A. C. Lucena 《American Journal of Plant Sciences》 2014年第7期1039-1048,共10页
Urochloa brizantha (synonymous of Brachiaria) is the most spread species of grass in the tropical world, primarily in regions with acid and low fertility soils. This study was conducted to investigate changes in the s... Urochloa brizantha (synonymous of Brachiaria) is the most spread species of grass in the tropical world, primarily in regions with acid and low fertility soils. This study was conducted to investigate changes in the soil chemical properties of a Typical Acrudox submitted to a strategy of grazing with rotational stocking, liming and nitrogen fertilisation. Treatments involved combinations of two pre-grazing heights (25 and 35 cm) with two rates of nitrogen (50 and 200 kg·ha-1·year-1). All combinations received lime, P and K fertilization and an untreated control group was allocated according to a complete randomised block design, five replications. Soil sampling was done in layers of 0-5, 5-10, 10-20, 20-30 and 30-40 cm deep in pastures of U. brizantha Marandu (Palisade grass). The samples were analysed for pH, H+ + Al3+, soil organic matter (SOM), P, K+, Ca2+, Mg2+, exchangeable and calculated CEC, BS% and aluminium saturation. Liming and fertilisation improve the soil fertility. The highest organic matter contents were obtained for the 0-5 cm layer, with a nitrogen fertilisation of 200 kg·N·ha-1. The management practice for the pre-grazing height of 25 cm, regardless of the nitrogen, is the best strategy for soil quality and livestock production. 展开更多
关键词 GRAZING HEIGHTS Rotational Stockings SOIL FERTILITY Urochloa brizantha
下载PDF
Alpha-Tomatin against Witches’Broom Disease
2
作者 Luiz Humberto Gomes Keila Maria Roncato Duarte +4 位作者 Felipe Gabriel Andrino Gildemberg Amorin Leal Jr Lia Matelli Garcia Antonio Figueira Simone Possedente de Lira 《American Journal of Plant Sciences》 2014年第5期596-604,共9页
Several plants use secondary metabolites against insects and pathogens attack. Among such metabolites known glycoalkaloids are the most studied. Plants from Solanaceae Family are the most abundant on those alkaloids. ... Several plants use secondary metabolites against insects and pathogens attack. Among such metabolites known glycoalkaloids are the most studied. Plants from Solanaceae Family are the most abundant on those alkaloids. Despite alfa-tomatine is a known glycoalkaloid, its specific action against Moniliophthora perniciosa, fungi responsible for witches broom disease in cocoa plantations was obtained in this work. Alfa-tomatine was infusion-extracted from Solanum lycopersicum leaves, and its action against the fungi growth was shown on the bioassays. In these tests, M. perniciosa growth was totally inhibited but other fungus tested, the inhibition was not totally, or did not present effect on growth, showing in this way, the specificity of alfa-tomatine to M. perniciosa. The advantages of work with a natural molecule for the fungi control is the stability of the molecule, its resistance to high temperature and pressure and for its use, the simple method of extraction used. The confirmation of the alfa-tomatine molecule was done by High Performance Liquid Chromatography and Mass Spectrometry in comparison to the Sigma standard. 展开更多
关键词 Cocoa GLYCOALKALOIDS SOLANACEAE
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部