Abstract
Abstract Field experiments were conducted to study the 15N-utilization of cucumbers (Cucumis sativus L.) grown on sandy loam under black mulch film. With the progress of the ontogenetic development the plants took up rising 15N-amounts, which were increasingly transferred to the fruits after the beginning of flowering. At the end of the vegetation period more than 55% of the applied 15N-labelled fertilizer was found in the plants, and from this portion more than 70% in the fruits. Up to 13% of the total plant nitrogen were derived from the fertilizer. In the top soil layer (0–30 cm) the 15N-content was strongly reduced during plant growth. Though most of the 15N was taken up by the plants, a 15N transfer to deeper soil layers (30–60 cm, 60–90 cm) was observed. Balancing the amount of applied 15N-fertilizer indicates a loss of 11% during the experimental period.
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