Efeitos da adubação silicatada e lâminas de irrigação na cultura do milho.

Abstract

The experiment was conducted under greenhouse conditions from the Department of Agricultural Engineering Technology Center and Natural Resources, Universidade Federal de Campina Grande, Campina Grande, PB, located at the geographical coordinates: 7° 15' 18" south latitude, 35° 55' 28" west longitude, average elevation of 550m. 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 of sites of adsortion of phosphorus in the soil, making phosphorus more absorbable by the plants. Another point of importance is that silicon tends to form an extra layer in the cell providing greater slice to the cell wall, making the plant more resistant to mechanical damage and to water stress. So the objective, for both, to assess the effects of silicate, present in steel industry waste, and water blades on the corn plants development. The treatments were the combinations of four irrigation levels concerning water replacement of 50, 75, 100 and 125% of crop évapotranspiration, 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 length and stem diameter, leaf area and shoot dry weight were implemented by irrigation water and/ or silicate fertilization. Corn yield was significantly influenced by the doses of silicate and water blades, it was obtained the largest grain production with the silcate dosage of 600kg ha"1, and higher irrigation. The highest efficiency of water use for grain production was with the treatments of 600kg. ha"1 combined with the 125% blade replacement of the ETc.