ISHS Acta Horticulturae 579: II Balkan Symposium on Vegetables and Potatoes
GENOTYPIC DIFFERENCES IN CRITICAL NITRATE RANGE FOR DIAGNOSING NITROGEN NUTRITION STATUS OF POTATOES |
| Authors: | I. Papastylianou, S. Gregoriou |
| Keywords: | Potato, Petiole Nitrate, Critical Nitrate Range |
| Abstract:
The nitrate concentration in petioles (PNC) throughout the growing season of three potato cultivars (Cara, Nicola, Spunta) was used to examine the genotypic differences in Critical Nitrate Range (CNR). The crops were grown under non-water stress conditions in Terra Rosa soil in Cyprus. Four fertilizer rates (0, 80, 160 and 240 kg N/ha) were applied in three methods (a) at sowing, (b) 60 days after planting and (c) split between the two times of application. CNR is defined as the range of PNC in plants giving optimum and just below optimum tuber yield. The results showed distinct differences in CNR among cultivars. It is therefore necessary to establish the CNR for each specific cultivar before diagnosing the nitrogen nutrition status of the crop. | |
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