PRODUÇÃO DE CANA-DE-AÇÚCAR COM USO DE DEJETO LÍQUIDO DE SUÍNOCULTURA: NUTRIÇÃO E QUALIDADE DA MATÉRIA PRIMA

Abstract

The main objective of using mineral and organic fertilizers is to correct, conserve or recover soil fertility, providing nutrients to plants, thus increasing the qualitative and quantitative yields of crops. Mineral fertilizer is derived from products of natural mineral origin, and its use is of utmost importance for the growth and development of sugarcane, so fertilization is a high component of the production cost. Organic fertilizers derived from natural animal waste, which release nutrients into the soil during mineralization, are a common waste product. A common waste product is pig slurry (SWL), which is often disposed of inappropriately and impacts the environment. However, if used as fertilizer, it is possible to meet production demands by providing nitrogen (N), phosphorus (P), potassium (K), and some micronutrients such as zinc (Zn) and copper (Cu). The general objective was to evaluate the potential of SWL as a source of P and K for sugarcane, verifying its effects on productivity, foliar accumulation of P and K, and sugar yield (ATR and TAH). In this sense, we carried out an experiment in a sugarcane field with the RB966928 variety in the fifth cut, with the application of increasing doses of SWL (0, 20, 40, 60, 80, and 100 m3/ha). The experimental design was DBC distributed in four blocks. The variables analyzed were: leaf P and K contents, TCH, ATR, TAH. The 100 m3/ha treatment favored greater accumulation of P in leaves, in addition to increasing stalk productivity by 27%, a fact that also led to an increase in tons of sugar per hectare. Thus, we demonstrated the viability of using DLS to meet P and K requirements with increased productivity and reduced production costs.