Crescimento e produtividade da cultura da cana-de-açúcar cultivada sob condições de adubação silicatada e lâminas de irrigação.

Abstract

The experiment was conducted under field conditions in the area belonging to the farm situated on the Ponta da Serra City Queimadas, PB, located by geographical coordinates: 7 0 22 '00 "south latitude, 36 * 00'06" longitude. It considers that the application of steel industry residues in doses that reflect the growth of silicon as a nutrient and not as a corrective of soil acidity leads to the saturation, to form an extra layer in the cell providing greater slice to the ceil wall, making the plant more resistant to mechanical damage and to water stress. The objective, for both, to assess the effects of silicate, present in steel industry waste, and water blades on the sugarcane plants development. The treatments were the combinations of five irrigation levels concerning water replacement of 50, 75, 100, 125% and 150 % ETc of crop evapotranspiration, with four doses of calcium silicate and magnesium corresponding to 0, 300, 600 and 900kg ha"1 of silicon. The experimental design was in a randomized block in split plots, and the irrigation water divided into tracks and silicon levels composing subplots. It was found that the growth variables such as plant height, length stem diameter, leaf area and shoot dry weight and the root were implemented by irrigation water and/ or silicate fertilization Sugrcane yield was significantly influenced by the doses of silicate and water blades, it was obtained the largest grain production with the silcate dosage of 900 kg ha"' and irrigation 125% of the ETc blade replacement.