Crescimento e produtividade da cana-de-açúcar submetida à aplicação de torta de filtro e substâncias húmicas

Abstract

This study aimed to evaluate the growth, agroindustrial yield and nutritional status of sugarcane subjected to the application of filter cake and commercial humic substances. The experiment was conducted on Sugar Mill Santa Clotilde, Rio Largo, AL, from the 21st of December, 2013 untill the 27th of October, 2014. The experiment was conducted in a randomized complete block design with four replications in a 3x4 factorial. The treatments consisted of three filter cake doses (0, 16 and 32 t ha-1), and different commercial products based on humic substances: Humitec WG®, Fertiactyl Sweet®, Agrisolo®. The following variables were evaluated: tillering, plant height, leaf area index (LAI), stem diameter, nutrient uptake, and agro-industrial yield. The results were then submitted to an analysis of variance with the application of the F-test (p <0.05). The Skott-Knott test (p <0.05) was used in order to compare the means of the qualitative treatments. A regression analysis was used for the quantitative treatments. Tillering was influenced only at 30 DAP for the application of filter cake. The plant height significantly responded to the application of commercial humic substances at 120 DAP. Stem diameter, LAI, TCH and technological variables did not show statistically significant results with the application of filter cake and commercial humic substances. Calcium and magnesium nutrients showed significant differences for quadratic regression as a function of the different filter cake doses. The nutrients potassium, phosphorus, sulfur and micronutrients copper, iron, zinc, manganese and boron did not show significant influence with the application of filter cake and commercial humic substances.