01316naa a2200229 a 450000100080000000500110000800800410001910000200006024501380008026000090021852006960022765000180092365000070094165300070094865300060095565300180096165300070097965300060098665300060099270000190099877300690101716468471995-08-24       1977    bl ---       0--  u    #d1 aANDERSON, C. A.  aSeasonal changes in the relationships between macronutrientes in orange (C. Sinensis OSB) Leaves and soil analytical data in Florida.  c1977  aLeaf (spring flush) and soil sample were collected periodically duringthe spring and summer for 4 years (1973-1976) from commercial orange groves planted on deep sandy soils (Typic Quartizipsaments) in Florida. The chronological leaf contents of Ca increased while K decreased after reaching a maximum in 3-month-old leaves. Leaf N and Mg contents increased significantly to a plateau in 4-month-old leaves and leaf P decreased, reching a constant value at 4 to 6 months of age. Subsurface (15-91 cm) soil pH was about 1 unit lower than in the surface layer (0-15 cm ), while extractable Ca, Mg, K, and P were approximately 16, 25, 49, and 48% lower, respectively, than in the surface layer.  asoil analysis  aPh  aCa  aK  aLeaf analysis  aMg  aN  aP1 aALBRIGO, L. G.  tReprinted from Proc. Int. Soc. Citriculturegv.1, p.20-25, 1977.