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Kacjan Marsic, N. (Lubiana Univ. (Slovenia). Inst. for Growing, Viticulture and Vegetable Growing); Osvald, J. (Lubiana Univ. (Slovenia). Inst. for Growing, Viticulture and Vegetable Growing)
Agrochimica, (Jan-Apr 2005), Volume: 49, Issue: 1-2Journal Article
Two successive experiments were conducted, during Summer and Autumn 1999, with young lettuce plants (Lactuca sativa L. var. capitata) in a closed hydroponic system. In order to monitor the nitrogen dynamics within the plant, 15N was used as a tracer. The treatments were: 13.0, 0.5, 0.1 and 0.0 mM NO3N. Growth of lettuce plants decreased progressively as the level of N supply decreased and at the lower treatment the shoot growth was more affected than root growth. In the highest treatment (13.0 mM) there was little net movement of 15N into or out of the roots, but under more deficient conditions (0.5, 0.1 and 0.0 mM) 15N increasingly accumulated in the roots Sono stati effettuati due esperimenti successivi, nel corso dell´estate e dell´autunno del 1999, con piante giovani di lattuga (Lactuca sativa L. var. capitata) in un sistema idroponico chiuso. Allo scopo di controllare la dinamica dell´azoto nell´ambito della pianta, è stato utilizzato 15N come tracciante. I trattamenti sono stati: 13,0, 0,5, 0,1 e 0,0 mM di NO3N. La crescita delle piante di lattuga diminuiva progressivamente al calare del livello di disponibilità di N e al livello più basso di trattamento la crescita del germoglio era influenzata maggiormente rispetto al germoglio. Nel trattamento più alto (13,0 mM) si riscontrava un leggero movimento netto di 15N dentro e fuori dalle radici, ma in condizioni di maggiore carenza (0,5, 0,1 e 0,0 mM) l´15N si accumulava progressivamente nelle radici.
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