Potassium et magnésium: deux éléments limitant la croissance en hauteur du pin rouge au Québec

Publisher Website
Google Scholar
Abstract
Relations between the site index of red pine (Pinusresinosa, Ait.) and foliar concentrations in N, P, K, Mg, Ca, and Mn, the soil content in O.M., total N, available P, exchangeable K, HNO3 extractable K, exchangeable Mg and Ca, and the percentage of silt plus clay of 23 sample plots on fluvio-marine or associated deposits in the St-Lawrence plain were studied. The site index varies between 28 and 42 at 20 years b.h. There are significant and positive linear correlations between the site index and concentrations in K, Mg, and Ca in the needles. The linear correlation for Mn is significant but negative. However, multiple regression analysis indicate that only potassium and magnesium were significantly associated with the regressions.There are significant and positive linear correlations between the site index and the soil content in HNO3 extractable K, exchangeable K and Mg. However, multiple regression analysis indicate that only HNO3 extractable K has a significant contribution to variations of site index and the contribution of exchangeable Mg is almost significant at 0.05. There are also significant and positive linear correlations between the foliar concentrations of potassium and magnesium and the respective soil contents in HNO3 extractable K and exchangeable Mg. Height growth of red pine in St-Lawrence plain is closely related to the nutrient status of potassium and magnesium in the sites under investigation.
Keywords

This publication has 0 references indexed in Scilit: