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Fertilization with phosphorus increases soil nitrogen absorption in young plants of Eucalyptus grandis.Author(s): Corina Graciano; Juan F. Goya; Jorge L. Frangi; Juan J. Guiamet
Source: Forest Ecology and Management 236 :202–210
Publication Series: Miscellaneous Publication
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DescriptionNitrogen (N) and phosphorus (P) are the nutrients that most commonly limit tree growth. Interactions between fertilization and soil type are well known, and in soils with moderate or low N availability, N-fertilization is frequently recommended to improve tree nutrition. The aim of this paper was to analyze how different doses of P and N applied in three different types of soils affect dry mass and nutrient accumulation and partitioning in Eucalyptus grandis young plants, and if fertilization with P may increase N uptake. Fertilization was applied as 1, 2 and 4 g of urea (46% of N) or 6, 12 and 24 g of triple superphosphate (20% of P) per plant. Dry mass and nutrient partitioning were analyzed 44, 72 and 84 days after transplanting (DAT). Interactions between soil type and fertilization were observed. Root:total mass ratio decreased with P-fertilization in all soils. Fertilization with P promoted growth and improved N and S absorption even more than N-fertilization, although some of the soils used have very low N-contents (0.03%). Our data suggest that fertilization with P increased N absorption through a mechanism that was not related to increased N demand by enhanced growth.
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CitationGraciano,Corina; Goya, Juan F.; Frangi,Jorge L.; Guiamet, Juan J. 2006. Fertilization with phosphorus increases soil nitrogen absorption in young plants of Eucalyptus grandis. Forest Ecology and Management 236 :202–210
KeywordsNutrient uptake, Soil/fertilization interaction, Growth, Tissue nutrient concentration
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