חיפוש מתקדם
Journal of Horticultural Science

Aloni, B.,
B. Bar‑Yosef,
B
. Sagiv
E. Pressman

The experiment was carried out in a greenhouse on a tuffgrowth medium, the tfeatments being: (i) 3 levels of NPK in the irrigating solution, with constant N: P: K ratios; (ii) transient nutrient starvation for various periods; (iii) transferring the plants from a.low to a high fertilization regime. The percentage of N, P and K in the plants’, leaves 102 days after planting was directly related to the final yield. However, the percentage of- “these elements at which pithiness was initiated due to nutrient starvation depended on the level of the nutrient supply prior to the starvation. The maximal celery yield was obtained when the N concentration in the irrigating solution was 50 ppm during the first 80 days from planting, followed by irrigation with 200 ppm N until the end of the experiment. Petiole pithiness in the trimmed plants was completely eliminated under these conditions. When N was applied at a concentration of 200 ppm throughout the experiment a similar yield was obtained, but 16.5% of the petioles were pithy. It is suggested that low fertilization during the first two-thirds of the growth period followed by rich fertilization until harvest produces celery heads of high quality.

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The effect of nutrient solution composition and transient nutrients starvation on the yield and petiole pithiness in celery plants
58

Aloni, B.,
B. Bar‑Yosef,
B
. Sagiv
E. Pressman

The effect of nutrient solution composition and transient nutrients starvation on the yield and petiole pithiness in celery plants

The experiment was carried out in a greenhouse on a tuffgrowth medium, the tfeatments being: (i) 3 levels of NPK in the irrigating solution, with constant N: P: K ratios; (ii) transient nutrient starvation for various periods; (iii) transferring the plants from a.low to a high fertilization regime. The percentage of N, P and K in the plants’, leaves 102 days after planting was directly related to the final yield. However, the percentage of- “these elements at which pithiness was initiated due to nutrient starvation depended on the level of the nutrient supply prior to the starvation. The maximal celery yield was obtained when the N concentration in the irrigating solution was 50 ppm during the first 80 days from planting, followed by irrigation with 200 ppm N until the end of the experiment. Petiole pithiness in the trimmed plants was completely eliminated under these conditions. When N was applied at a concentration of 200 ppm throughout the experiment a similar yield was obtained, but 16.5% of the petioles were pithy. It is suggested that low fertilization during the first two-thirds of the growth period followed by rich fertilization until harvest produces celery heads of high quality.

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