Agabbio, Mario Carlo Salvatore and Frau, Antonio Maria and Ortu, Salvatore (1976) Variazioni annuali dell'azoto, fosforo e potassio negli organi epigei delle drupacee in ambienti di coltura meridionali: nota 3.: mandorlo «Rachele». Studi sassaresi: organo ufficiale della Società sassarese di Scienze mediche e naturali. Sez. 3: Annali della Facoltà di Agraria dell'Università di Sassari, Vol. 24 , p. 43-55. ISSN 0562-2662. Article.
Some observations were conducted on «Rachele» almond variety in order to evaluate annual changes of N, P, K in various tree organs (flower-buds. flowers and fruits: leaves and shoots). 55 Total amount of N. P. K in flower-buds, flowers and fruits increased progressively during growth season. As percent of dry matter, on the contrary, mineral content of these organs in the some period decreased. N and P leaf content (as percent af dry matter) decreased from springflush to leaf fall: while an increasing of such elements was recorded in the shoot during late summer, followed by a decreasing from early fall to spring flush, flowering and fruit growth. Leaf K changes were not clear, as well the relations betweeen changes on mineral content of various organs and shoot and fruit growth.
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