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Foliar nutrient status and nutritional relationships of young Pinus radiata D. Don plantations in northwest Spain

AutorZas Arregui, Rafael ; Serrada, Rafael
Palabras claveNutritional status
Soil analysis
Foliar analysis
Deficiency diagnosis
Pinus radiata
Fecha de publicaciónfeb-2003
CitaciónForest Ecology and Management 174 (1–3): 167–176 (2003)
ResumenFifty-four plots of young Pinus radiata D. Don plantations on abandoned agricultural land in Galicia (northwest Spain) were selected for nutritional diagnosis. Nutritional status was assessed by foliar analysis using the critical levels method. The relationships between foliar nutrient concentrations and the plantation’s growth and survival and the topsoil physical and chemical properties were also analyzed. The most common deficiencies among plots were P and Mg. Foliar N concentrations were relatively high and generally they were above the critical level. Foliar N:P, N:K and N:Mg ratios were significantly unbalanced in 31, 44 and 17 out of 54 studied plots. Foliar P levels were significantly higher on sites with previous herbaceous land use and on soils with a finer texture, whereas foliar Mg levels were higher at low altitudes. Foliar nutrient levels were not significantly correlated with their respective soil levels except in the case of K. Foliar Ca and Mg concentrations correlated positively with topsoil pH. Growth correlated positively with foliar K and Mg concentrations and negatively with foliar N:P, N:K and N:Mg ratios. Percentage of dead and poor state plants were negatively correlated with foliar P, K and Ca levels and positively correlated with foliar N:P and N:Mg ratios. These results suggested that nitrogen may be in excess and may condition the uptake of other nutrients. Foliar N level was considered as an unfavorable parameter, whereas foliar P, K, Ca and Mg concentrations were considered as favorable parameters for P. radiata establishment in Galicia.
Versión del editorhttp://dx.doi.org/10.1016/S0378-1127(02)00027-0
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