Magnesium content in the leaves of winter wheat in a long-term fertilization experiment

Long-term experiments facilitate the observations of changes in soil properties affected by agricultural activity as well as the reactions of crops to those properties. The aim of the study was the assessment of the relationship between the soil pH as well as contents of organic carbon, total nitrogen, available forms of phosphorus, potassium (K-av), magnesium (Mg-av) and the magnesium content in flag leaves (Mg-fl) in winter wheat. There was also determined the correlations between the Mg-fl content and the nitrogen (N-fl), phosphorus, potassium (K-fl) and calcium (Ca-fl) contents in those leaves. The Mg-fl content was at-the-highest-level linearly positively correlated with soil pH and its richness in Mg-av. The dependence of the Mg-fl content on soil properties and the wheat leaves chemical composition was best described by polynomial equations of the 2nd degree, except for the K-av and K-fl contents. The Mg-fl content depending on the Mg-av content x soil pH and Mg-av x K-av interaction. The winter wheat containing more N-fl and Ca-fl and less K-fl, accumulated more Mg-fl.