Foliar diagnosis in the orchard: review of a 20 years study | Le diagnostic foliaire en arboriculture: bilan de 20 ans d'etude
2007
Neyroud, J.A., Station de recherche Agroscope Changins-Waedenswil ACW, Nyon (Switzerland) | Amiguet, S. | Andrey, G. | Evequoz, Ch.
This study presents a review of experiments made during 20 years with the foliar diagnosis method. Leaves samples of apricot, cherry, pear and apple trees have been collected at prescribed dates on healthy and productive orchards and analysed for their N, P, K, Mg and Ca-contents. Reference values were calculated according to average contents and statistical distributions of the results. In some cases, specific reference values had to be defined for some varieties, nutrient elements or years. Any other sample can then be analysed and compared to the proper reference values; differences from reference values are interpreted in terms of nutrient availability, equilibrium in nutrient uptake and tree vigour. Results obtained so far confirm the interest of the foliar diagnosis approach; this method might be further improved by a more precise definition of sampling time and by a more elaborate evaluation of nutrient contents and ratios, as realised in the DRIS model.
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