Micronutrientes e reação de um latossolo cultivado com cana-de-açúcar fertirrigada - DOI: 10.7127/rbai.v8n400239

The use of fertigation on sugar-cane can promote changes in soil chemistry. Thus, the aim of this study was to evaluate changes in soil micronutrients and soil reaction in sugar cane plantation with nitrogen and potassium fertigation at different levels. This experiment was carried out in an Oxisol from the experimental area of Federal Institute of Education, Science and Technology Goiano – Goias State. Was used RB 85-5453 sugar cane variety and irrigated with different levels (0, 25, 50, 75 and 100 % of the crop water requirement), with and without nitrogen (0 and 100 kg N ha -1 ). Sugar cane productivity was evaluated, as well as, the levels of boron, zinc, copper, iron, manganese, hydrogen + aluminum, soil organic matter, cation exchange capacity, base saturation and soil pH, after nitrogen fertilizer application in surface (0 to 0.30 m) and subsurface (0.30 0.60 m). Fertigation combined with different irrigation levels caused soil chemical changes, both soil reaction and soil micronutrient content. Irrigation levels factor had significant effect on changing the of cation exchange capacity, hydrogen + aluminum, copper and iron contents. Fertigation factor influenced significantly zinc, hydrogen + aluminum, base saturation and soil pH, and caused soil acidity. The biggest changes in soil chemical properties were due to soil layers analyzed. Fertigation increased the sugar cane productivity.