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How many mineral nutrients does a hazelnut orchard take up annually from the soil?

Roversi, A.
Acta horticulturae 2014 no.1052 pp. 201-206
algorithms, alternate bearing, boron, calcium, chemical analysis, copper, harvesting, hazelnuts, iron, magnesium, manganese, mineral content, mineral fertilizers, nitrogen, nutrients, orchards, phosphorus, piedmont, planning, potassium, soil, sulfur, zinc
The knowledge on the amount of mineral nutrients an orchard takes up from the soil, seems to be an essential pre-requisite to plan the annual mineral fertilizers supply to this orchard. Unfortunately data on this topic, are not easily available, so, starting from 2002, my Institute began some experimental investigations in this regard. In the Langhe district, Piedmont, in 2 orchards (Montelupo and Rodello), for 10 years, the yield was recorded and nut samples were taken for determination of macro- and micro-nutrients contents. For each orchard, 5 representative hazelnut plants were chosen and considered for all the years to check yield and to harvest samples for chemical analysis. N, P, K, Ca, Mg, Fe, Mn, Zn, Cu, S and Boron, were determined on the dry matter of the whole fruit. The results (kg and g for macro- and micro-elements respectively) are expressed by hectare and by ton of production. Alternate bearing characterized the yield in the both orchards of which Rodello was the most productive. The whole fruit mineral composition was not so affected by off/on years even if in the off years the contents were a little higher for N, P, K, Ca, S, B, Fe, Cu, Zn. As expected the annual uptake related to hectare and especially to fruit t/ha, were highly influenced by the year productivity. The larger amount of extracted elements appeared to be nitrogen, followed by K for the macro, and iron, followed by Zn for the micro-nutrients. These results could be very interesting to estimate the amount of mineral fertilizers annually required by the hazelnut orchard, through the Szücs algorithm.