Adubação potássica sob diferentes densidades de plantio na cana-de-açucar

Abstract

Brazil is the world's largest producer of sugarcane, with this crop having great importance for Brazilian agribusiness. In Paraíba, the area for the production of sugar cane, in this harvest, is 121.3 thousand hectares, varying 1.4% in relation to the 119.6 thousand hectares used last season. The objective of this work was to evaluate the yield of sugarcane in the second leaf, under the use of potassium in cover and in 5 different planting densities. The work was carried out in the experimental area of Chã de Jardim, located in the city of Areia. The experimental design adopted was in randomized blocks following the factorial 5x2, which assesses the condition of 5 planting densities (5,10,15,20,25 buds per meter) under potassium fertilization and without top dressing. The parameters analyzed were: Height of plant, Height of stem, Diameter of stem, number of nodes, Grade brix and Productivity (TCH). The data obtained were subjected to analysis of variance, using the Sisvar software. As a result of the analysis of variance, the variables plant height, stem height, stem diameter and number of internodes were influenced by the application of potassium, the planting density, there was a statistical difference in the regression analysis, only for the plant height variables and TCH when potassium was applied in coverage. Among the variables analyzed, only ° Brix was not influenced by any of the factors tested and had an average of 16.72. The application of potassium in cover was efficient in improving the variables of plant height, stem height, stem diameter, number of internodes and TCH, thus, it is essential to fertilize with this nutrient for sugarcane.