Sugarcane Technological Quality Cultivated in Different Sources of Fertilization Supplemented Soil, Using a Commercial Organic Compost.

This experiment aimed to assess the sugarcane technological quality grow in different sources of fertilization supplemented soil with or without use of the organic compost MICROGEO. The work was installed and conducted in Faculdade de Ciências Agrárias e Veterinárias/UNESP, Jaboticabal, São Paulo state, Brasil. The design was a randomized block design in a factorial 5x2 (5 forms of fertilization and 2 levels of application of organic fertilizer) with 3 replications. The experiment cultivation was on April 4th, 2009, with supplementation of the first factor, composed of the five sources of fertilization: T1 (liming); T2 (filter cake and vinasse); T3 (filter cake, vinasse and half of the recommended phosphate fertilization); T4 (filter cake, vinasse and complete recommended phosphate fertilizer); T5 (recommended mineral fertilization). The second factor studied was the use of organic fertilizer, applied on January 31, 2013. Close to experiment harvest, the tecnological quality of the materials were measured in laboratory, on October 13th, 2013, determinating the variants Brix, Pol, Reducing Sugar (RS), Total Reducing Sugar (TRS), Fiber, and Moisture, according to the method proposed by CONSECANA. In possession of this results, the Total Sugar Recoverable (TSR) was calculated. The obtained results were subjected to analysis of variance by F test, and when there was significance, the means were compared by Tukey test at 5% probability. For TRS, TSR and Pol, the sources of fertilization showed differences, with the liming tratament (T1) obtaining the higher values, explained by the longer period of sugar storage, due to the stress caused by lack of nutrients in the soil, including organic fertilization. There was a positive correlation between sources of fertilization and the organic compost for the variant Reducing Sugar, with the treatment with filter cake, vinasse and recommended phosphate fertilizer (T4) getting smaller value among the fertilization sources using the organic compost. Keywords: filTer cake; Pol; TSR