'Chardonnay' grape juices from different types of phosphorus fertilizer treatments

On the vine, phosphorus deficiency causes a reduction in the development of the root system and growth retardation. This study aimed to define the best option in phosphorus fertilization of vines 'Chardonnay' as well of the quality of grape must. The experiments it was carried out by for the Core for Study, Research and Extension in Enology (NEPE²)/UNIPAMPA - Campus Dom Pedrito, RS, Brazil, with grapes harvested in the region of “Dom Pedrito” in season 2014/2015. The treatments were: T1 - control (phosphorus absence); T2 - producer match plant (NPK); T3 - triple superphosphate plant and; T4 - natural phosphate plant. The work was analysed by infrared spectrometry Fourier transform (FTIR) were evaluated: total soluble solids, total acidity, potassium content, pH and density. The results show that treatment 1 had fewer total soluble solids (19.2 °Brix), since the treatments containing phosphorus obtained better results (T2=19.4 °Brix, T3=19.75 °Brix and 
T4=19.85 °Brix). Moreover, the amount of potassium was found higher in treatment 1 than in the treatments containing phosphorus. Overall, it can be concluded that fertilization with phosphorus acid reduces the possibility of loss in the tartaric stabilization process due to having smaller amounts of potassium.