EFFECT OF N:K MOLAR RATIO IN FERTIGATION ON QUALITY OF GREENHOUSE-GROWN STRAWBERRIES IN BRAZIL
The goal of present study was to evaluate the yield and quality of two cultivars of strawberry grown on soil mulches, in a greenhouse, with five different fertigation. The experiments were carried out in Embrapa, Brasilia, DF, and were set as a 5×2 factorial split block design with 4 replicates. The whole-plot treatments consisted of four different N:K molar ratios (3:0.5, 3:1, 3:1.5, and 3:3), plus the control (without potassium), applied in fertigation along the whole production period. The split-plot treatments were two different cultivars, Diamante and Oso Grande. The experiment was developed under greenhouse conditions and grown on soil mulches (white polyethylene). Fruits were harvested from September through December, and pH, total soluble solids (°Brix), weight, firmness, colour, titratable acidity and total phenolic compounds were analyzed. Total phenolic content determination was based on a Folin-Ciocalteu modified method. In both cultivars and in both sampling dates, the N:K ratio influenced the total soluble solids contents, titratable acidity levels and total phenolic. There was no significant difference among the applied fertigation treatments on colour and firmness. However, the lower N:K ratio, increases the quality of strawberry fruits, which confirms the importance of potassium nutrition in the quality of strawberry fruits.
Maldonade, I.R., Guedes , I.M.R., Michereff Filho, M. and Ferreira, N.A. (2012). EFFECT OF N:K MOLAR RATIO IN FERTIGATION ON QUALITY OF GREENHOUSE-GROWN STRAWBERRIES IN BRAZIL. Acta Hortic. 927, 291-294
protected cultivation, phenolic compounds, yield, antioxidant