The Importance of Soil Quality Indices for Fighting against Microsphaera Abbreviata in Durmast Seedlings

Satisfactory soil fertility is a suitable premise for supplying plants satisfactory development. The aim of this paper was the identification of the role of the most important soil indicators involved in durmast seedlings resistance against powdery mildew attack. A durmast nursery located in Transylvanian Plain was monitored in 2008. Basic statistic and correlations were calculated using STATISTICA v. 7.0. In 2008, a non linear dependence between analyzed parameters was reported. Weak negative correlations between the powdery mildew attack degree and humus (- 0.339), nitrogen (0.346) and phosphorus (- 0.313) were reported. They are representative only in a reduced sample share (11.40%, 11.0% and 9.70%, respectively) and not significant, all characterized by non linearity. By entire experimental period, the correlation between the powdery mildew attack degree and potassium content of soil, apart the other studied correlations, is linear, negative, and very weak, not representative (R2 = 0.004).