Produtividade agrícola e industrial da cana-de-açúcar sob diferentes fontes e doses de fósforo

Abstract

Sugarcane yield increases each day on Brazil. Due to its high biomass production, there is a large removal of soil nutrients, requiring a proper use of fertilizers to replace them. The use of phosphorus sources and filter cake come as an alternative to replace this loss. The following work was developed, aiming to evaluate the growth, agricultural and industrial yield of the sugarcane variety RB92579 under different sources and levels of phosphorus. The experiment was carried out on sugar mill industry Sumaúma, located in Marechal Deodoro – AL. The experimental design used was a randomized block design with four replications, arranged in a 3x5 factorial, totaling 15 treatments, corresponding to three sources of phosphate (control, single super phosphate and filter cake) and different levels of phosphorus (Triple Super Phosphate – 0, 80, 120, 160 and 200 kg ha-1). The levels of P (Triple Super Phosphate) were applied on the bottom of the grove. The filter cake and phosphate were applied to the total area. Each plot consisted of eight furrows, 20 m long. The spacing used was a combination of 1.50 x 0.90 m between rows. During the development of this work, the following biometric analysis were made: height, diameter and number of plants per linear meter. At harvest, the following analysis were made: stalk production (TCH) and technological analysis (Brix, Fibra, Pol, ARC, PC, ART and ATR). The analysis of variance and mean test of Scott-Knott at a 5% level of probability was made after gathering the data of all variables. The critical levels found in this work raised the P content of both soil and leaf to the recommended values. The different levels of P applied on the bottom of the grove influenced the % of fiber. The different sources and level of P applied did not influence the height, diameter and number of plants per square meter. kg ha-1. The different sources and level of P applied influenced the agricultural and industrial yield. The treatment with filter cake applied to the total área increased the MCA.