In this article:
Foliar diagnosis is widely used as a guide to optimum fertilizer practices for a range of horticultural crops but the value of analytical data is dependent on knowledge of three factors: the change in composition of each element during the season for the particular foliage tissue sampled, the relative distribution between tissues, and some standards on which to base a comparison.
Foliar diagnosis of mineral deficiencies in Vitis spp. is limited because not all elements have been studied adequately and because sampling procedures have not been standardized between workers in this field.
This study using Sultana vines was initiated to determine which leaf tissue was the most suitable for foliar diagnosis of nutrient deficiencies in the spring growth period. Contents of P, K, Ca, and Mg in basal and recently matured laminae and petioles, and of N in laminae are discussed in relation to the choice of sampling tissue for diagnostic purposes.
It is concluded that the most satisfactory single tissue for diagnosing deficiencies of P, K, Ca, or Mg is basal petioles.
Chemical Composition of Leaf Tissue of Sultana Vines Grown in Nutrient Solutions Deficient on Macroelements
1970, Sonderdruck aus der Zeitschrift ‘Vitis’, vol 9, pages 207 – 217
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