INFIVE   05416
INSTITUTO DE FISIOLOGIA VEGETAL
Unidad Ejecutora - UE
artículos
Título:
Fertilization with phosphorus increases soil nitrogen absorption in young plants of Eucalyptus grandis
Autor/es:
CORINA GRACIANO; JUAN FRANCISCO GOYA; JORGE LUIS FRANGI; JUAN JOSÉ GUIAMET
Revista:
FOREST ECOLOGY AND MANAGEMENT
Referencias:
Año: 2006 vol. 236 p. 202 - 202
ISSN:
0378-1127
Resumen:
Nitrogen (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 soil 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. 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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