אסיף מאגר המחקר החקלאי

Effects of supplied nitrogen form and quantity on growth and postharvest quality of Ranunculus asiaticus flowers

Year:

2005

Source of publication :

Authors :

Volume :

40

Co-Authors:

Bernstein, N., Institute of Soil Water and Environmental Science, ARO, Volcani Center, POB 6, Bet Dagan, 50250, Israel
Ioffe, M., Institute of Soil Water and Environmental Science, ARO, Volcani Center, POB 6, Bet Dagan, 50250, Israel
Bruner, M., Extension Service, Ministry of Agriculture, Israel
Nishri, Y., Extension Service, Ministry of Agriculture, Israel
Luria, G., Extension Service, Ministry of Agriculture, Israel
Dori, I., Havat Habsor, R and D South, MP Negev, 4, 85400, Israel
Matan, E., Havat Habsor, R and D South, MP Negev, 4, 85400, Israel
Philosoph-Hadas, S., Department of Postharvest Science of Fresh Produce, ARO, Volcani Center, Bet Dagan 50250, Israel
Umiel, N., Institute of Horticulture, ARO, Volcani Center, Bet Dagan 50250, Israel
Hagiladi, A., Institute of Horticulture, ARO, Volcani Center, Bet Dagan 50250, Israel

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Abstract:

The form of N supplied to the plant (NH 4 + or NO 3 -) affects growth, morphology and a range of physiological processes in the plant. Little information is available concerning the effects of N form on development, production or quality of cut-flowers. The present study investigated for the first time the effects of N form and quantity on growth, flower production and flower quality of Ranunculus asiaticus L. The plants were cultivated in an inert mineral soilless medium (perlite) and were exposed to two levels of nitrogen fertilization (50 or 100 ppm) and three levels of NH 4 + (10%, 20%, or 30%, under 100 ppm nitrogen fertilization). Larger shoots and increased shoot/root ratios were obtained in the lowest (50 ppm) N treatment. This treatment also excelled in flower yield production, resulting in higher numbers of total flower produced as well as higher numbers of long flowers. The results demonstrate an effect of N ferlilization treatments on cut-flower quality. Flowers grown under 50 ppm N application characterized by almost double vase life duration compared to flowers grown under the various 100 ppm N treatments. However, flower quantity and quality were not affected by the level of NH 4 applied. The R. asiaticus L root was less sensitive to the N fertilization treatments than its shoot. Contents of organic N, NO 3 -, P, K, Ca, Mg, Na, Cl, Fe, Cu, Zn, B, and Mo in the leaves were not affected by the fertilization treatments. Taken together, our results suggest a low requirement of R. asiaticus L. for N fertilization, and insensitivity to ammonium concentrations in the range of 10 to 30 ppm, 10% to 30% of the total N supplied. Detrimental effects in terms of growth, production and cut flower quality were apparent already under 100 ppm N supply.

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