Study Concerning the Influence of Soil Fertility upon Powdered Mildew Attack Degree in Durmast Seedlings

摘要

The present paper focuses a series of issues concerning the identification of the influence of the soil quality, from the point of view of the most important components for durmast development (nitrogen, phosphorus, potassium, humus, pH), upon the powdered mildew attack degree. The trial was conducted during two consecutive years, 2008 - 2009, and placed in a€?Mihai Viteazua€? nursery, located at. 4 km distance from Turda municipality, county of Cluj. The Microsphaera abbreviata attack degree was monitored, simultaneously with soil fertility. The experimental data were processed using STATISTICA v.7.0 programme. The averages of soil indices demonstrate good soil quality and fertility, during experimental period, 2008, and 2009, respectively. Even some influence of soil quality upon the powdered mildew attack degree was reported, it has small influence. It decrease in a small share with higher humus and nitrogen soil content (20.80, and 20.770, respectively), and in a light higher share with increase of phosphorus and potassium soil content (28.60% and 26.60%, respectively). So we can conclude that the increase of phosphorus and potassium soil content will contribute in a bigger share compared to humus and nitrogen, in reducing the powdery mildew attack degree against durmast seedlings from nurseries.