Seasonal changes in potassium, and other macronutrients in petioles and leaf blades of the vine cultivar Sultanina (Thompson Seedless) with symptoms of temporary potassium deficiency
Perez Harvey, J.; Leigh Nielsen, F.
Ciencia e Investigacion Agraria 17(1-2): 3-12
Studies were carried out with 90 vines of uniform growth, good development and productivity but showing symptoms of temporary K deficiency. Leaves without symptoms and those showing moderate or severe symptoms were sampled on 7 dates between 14 Nov. and 15 Feb. The K concentration in both blades and petioles increased gradually from bloom to veraison and decreased towards harvest.