Fertilisation azotée, phosphatée et potassique dans la production du bleuet nain sauvage

Abstract

Several studies have shown how nitrogen (N) fertilizers can increase blueberry productivity. However, available information on phosphorus (P) and potassium (K) is limited. This study evaluated the impact of NPK fertilizers on the soil chemical properties and agricultural factors. Plots received four rates of N (0–90 kg N ha−1), two rates of P (0 and 20 kg P2O5 ha−1), and four rates of K (0–90 kg K2O ha−1). A randomized complete blocks design was used at six sites in Saguenay-Lac-St-Jean. Following fertilizer application, pH decreased 0.1 unit in the surface soil and 0.2 units in the 5–30 cm deep soil layer. P and K accumulations were measured in the surface soil. Yield also increased 43% after the N application. Application of 20 kg P2O5 ha−1 appeared necessary to maximize yield when N fertilization was over 50 kg ha−1. Application of over 30 kg K2O ha−1 decreased the fruit yield up to 24% when combined with a >60 kg N ha−1. [Translated by the Editor]