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Nitrogen fertilization in citrus, 1: absorption and distribution in calamondin trees (Citrus mitis Bl.) during flowering, fruit set and initial fruit development periods  [1982]

Legaz, F. Primo-Millo, E. Primo-Yufera, E. Gil, C. et al.

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Abstract
The absorption rate of nitrogen (N) fertilizer labelled with ('15)N was studied during the flowering and fruit set periods in Citrus mitis Bl., trees grown in sand culture. The absorbed N was concentrated preferentially in ovaries, young fruits, new flush leaves and new flush twigs, but N supplied to these organs comes mostly from the N reserve in old leaves, old twigs and stem, and roots, and less than 3% of the absorbed N reached ovaries and young fruits. Nitrogen translocation to young fruits was higher during the fruit set period. Spring leaves were an essential organ since they received a large portion of the absorbed N and were quickly converted into a supplying organ. Old leaves, old twigs and stem, and roots supplied a great deal of N to developing organs; during fruit set, their N supply was replenished with N coming from fertilizer. During flowering, trees absorbed 30 mg per 1000 g of whole tree (dry weight) and per day. During fruit set, this amount increased considerably.
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Plant and Soil (Netherlands)

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