Utilização de torta de filtro em cana-soca nos tabuleiros costeiros da Paraíba

Abstract

The use of sugarcane in its entirety is a primordial factor for the sustainability of the production process of the sugar-alcohol complex. The large volumes of waste generated (such as filter cake) can be reused as a source of nutrients, reducing environmental contamination and spending on mineral fertilizer. Thus, the objective was to evaluate the response of fertilization with filter cake on the productivity of ratoon cane in the Coastal Tablelands of Paraíba. The experiment was conducted at Usina Monte Alegre S/A, Mamanguape - PB in the period 2021/2022 and the experimental design was in randomized blocks, with 12 treatments (T1 – Pie, T2 – Pie + Monoammonium Phosphate (MAP), T3 – Pie + Agricultural Gypsum, T4 – Pie + Natural Phosphate, T5 – Pie + Sugarcane Bagasse, T6 – Pie + MAP + Agricultural Gypsum, T7 – Pie + MAP + Natural Phosphate, T8 – Pie + MAP + Sugarcane Bagasse, T9 – Pie + Agricultural gypsum + Natural phosphate, T10 – Pie + Agricultural gypsum + Sugarcane bagasse, T11 – Pie + Natural phosphate + Sugarcane bagasse, T12 – Control (only MAP)), with four replications, totaling 48 plots. The commercial cultivar RB 041443 was used, planted semi mechanized, with conventional soil preparation, in alternating double spacing of 1.6 x 0.8 m. The performance of ratoon cane was evaluated in terms of growth and productivity. A significant effect was verified at 5% probability for the variables plant height, number of leaves, stem diameter and number of tillers up to 180 days after cutting. Also, a significant effect was observed for the variable number of internodes at 240 days after cutting. Likewise, there was also a significant effect at 5% probability by the Scott-Knott test for the TCH variable, with the best results obtained in treatments T2, T4, T7, T8, T10, T11 and T12 with yields greater than 130 t ha-1. The results show that the fertilizations with filter cake enriched with organic and mineral fertilizers influenced the vegetative variables and the productivity of the first ratoon.