Manejo da aplicação de fertilizantes minerais mistos na cultura da cana-de-açúcar

Abstract

Sugarcane is important both from an economic and social point of view, with the generation of jobs and income in all production systems. This culture has multiple uses and can be used for the production of ethanol, sugar, electricity, products used in human and animal food. Sugarcane productivity is regulated by several production factors, such as the proper application of fertilizers. Various mineral fertilizers have been developed to supplement the high demands of crops. Researches are being carried out in the area of soil fertility and sugarcane nutrition, with the aim of generating information to guide the proper management of sugarcane, so that it can express its maximum potential and increase profits. The aim of this research was to evaluate the application of mixed mineral fertilizers and their influence on sugarcane yield in the first cycle. The work was carried out in the experimental area Chã de Jardim, Centro de Ciências Agrárias – CCA, Campus II, Universidade Federal da Paraíba - UFPB, Areia – PB. The experiment was carried out in a randomized block design with six treatments and four replications, totaling 24 plots. Three products with the following composition were used: Product A: 6% P2O5 + 1% Mo + 2% Zn; Product B - 8% N + 25% P2O5 + 0.1% B + 0.1% Cu + 0.2% Mn + 0.02% Mo + 0.2% Zn; Product C - 4% N + 8% P2O5 + 2% K + 0.3% Mg + 1.0% S + 0.3% B + 0.5% Ca + 0.2% Cu + 2.0% Mn + 0.4% Mo + 0.5 Zn. The treatments consisted of a combination of these three products: T1 - absolute witness; T2 - 0.5 L ha-1 Product A (0 DAP) + 2.0 L ha-1 Product B (0 DAP); T3 - 1.0 L ha-1 Product A (0 DAP) + 2.0 L ha-1 Product B (0 DAP); T4 - 1.0 L ha-1 Product A (0 DAP) + 1.0 L ha-1 Product B (0 DAP) + 1.0 L ha-1 Product C (0 DAP); T5 - 1.0 L ha-1 Product A (0 DAP) + 1.0 L ha-1 Product B (0 DAP) + 1.0 L ha-1 Product C (90 DAP); T6 - 0.5 L ha-1 Product A (0 DAP) + 2.0 L ha-1 Product B (0 DAP) + 1.0 L ha-1 Product C (90 DAP). The evaluations performed were stalk height; number of stems per linear meter; stem diameter; number of internodes, degree ºBrix and TCH. The T3 treatment, which consists of combinations of 1.0 L ha-1 of 6% P2O5 + 1% Mo + 2% Zn + 2.0 L ha-1 of 8% N + 25% P2O5 + 0.1% B + 0.1% Cu + 0.2% Mn + 0.02% Mo + 0.2% Zn provided the largest increments for sugarcane in the first cycle. The need to carry out research in different agricultural years is evident, in order to obtain results that can prove the potential of the fertilizers used in the tested conditions.