Wheat tiller number and survival and ear and grain production as affected by nitrogen supply were studied in cv.Embrapa 16 in three field experiments at Estação Experimental Agronômica (UFRGS), in Eldorado do Sul, RS, during 1995, 1997 and 1998.The first-year treatment consisted in applying 40kgha-1 of N in different plant stages (emergence to 5th leaf stage), followed or not by an extra N-supply at the 7th leaf stage. In 1997 and 1998, different N rates were applied at plant emergence, […]

This study compares the chemical composition of the solution and exchange complex of soil in a 3-year-old irrigated vineyard (Vitis vinifera L., Red Globe cultivar) with that of adjacent clearing in the native hyperxerophyllic ‘caatinga’ vegetation. The soils are classified as Plinthic Eutrophic Red-Yellow Argisol; according to Soil Taxonomy they are isohyperthermic Plinthustalfs. Detailed physiographic characterization revealed an impermeable gravel and cobble covering the crystalline rocks; the relief of this layer was more undulating than the level surface. Significant higher […]