Fertirrigação com fontes alternativas de potássio no cultivo do Capim Tifton 85.

Abstract

Agricultural production has been the target of several researches aimed at the reuse of solid and liquid waste, to minimize the costs of this activity and reduce possible environmental impacts. Fertigation, for example, it is a technique that can be used to reuse this waste and pastures have favorable characteristics for being fertigated with effluents. In light of the above, The objective was to evaluate potassium fertigation management with manipueira and plant biomass ash in the cultivation of Tifton 85 grass. Para tanto, o experimento foi conduzido em ambiente protegido at the Semiarid Sustainable Development Center of the Federal University of Campina Grande, Sumé Campus PB between November 2021 and April 2022. The experimental design was completely randomized with a split-plot scheme, the plots were the grass cuts and the subplots were the combinations of sources (manipueira, vegetable and mineral biomass ash) and doses of potassium (60%, 80%, 100% and 120% of the recommended dose). At the time of the cuts, growth variables were analyzed, production and chemical analysis of the aerial part of Tifton 85, and at the end of the experiment, the effects of treatments on the soil were analyzed based on physical-chemical characteristics. The results showed that fertigation with manipueira and plant biomass ash promoted greater growth, mass production and better nutritional quality of Tifton 85 grass, indicating the dose of 100% (100 kg ha-1 of K) as the most viable in the use of mineral fertilizer and alternative sources of potassium in the production of this grass. In addition to ensuring positive effects on the physical-chemical characteristics of the soil at the end of the experiment.