Articles
THE INTERACTION BETWEEN CALCIUM CHLORIDE AND AMMONIUM-NITROGEN ON GROWTH, NITROGEN UPTAKE AND TRANSLOCATION IN APPLE AND SOUR ORANGE
Article number
721_20
Pages
159 – 164
Language
English
Abstract
There are reports indicating that Ca enhances N uptake and the growth of plants when N is supplied in the form of ammonium ion or as urea.
The purpose of the present studies was to elucidate the effect of Ca on foliar N absorption and growth of Red Delicious (RD) apple seedlings (Malus x domestica Borkh.), which were foliar-sprayed with urea.
Also, the effect of Ca: NH4 ratio in the rhizosphere of hydroponically-grown sour orange seedlings (SO) (Citrus aurantium L.) was studied in relation to the plants vegetative growth and N uptake.
Eight applications of 83 mM urea containing 0, 10.4, 20.8, or 41.5 mM CaCl2 were applied as a foliar spray to RD seedlings at 10 d intervals.
Control plants were sprayed with nanopure water.
Although foliar treatments with urea resulted in increased total leaf area, and leaf, stem, and root dry weight, the addition of CaCl2 did not increase the response.
However, the presence of CaCl2 in the spray solution significantly increased concentrations of N in stems and roots suggesting that CaCl2 enhanced translocation of foliar-applied nitrogen to these tissues.
The calculation of total N uptake by plants provided no evidence, however, of stimulated N uptake due to CaCl2 presence in the foliar spray solution.
SO seedlings were grown for six weeks in nutrient solutions in which all N was exclusively provided as ammonium ion with CaCl2:NH4 molar ratios of 1.0, 1.3, 1.6, 1.9, 2.2 and 2.5. The level of Ca: NH4 ratio had no effect on SO vegetative growth as measured by total leaf area, as well as leaf, stem, and root dry weight.
At the Ca: NH4 ratio of 1.3, however, the plants tended to have higher N concentrations in lateral and tap roots compared to those exposed to Ca:NH4 ratios of 1:1, 1.6, 1.9, 2.2, or 2.5. Since the growth of these plants was equal to that in the other treatments, this result may also suggest the enhanced N uptake.
The purpose of the present studies was to elucidate the effect of Ca on foliar N absorption and growth of Red Delicious (RD) apple seedlings (Malus x domestica Borkh.), which were foliar-sprayed with urea.
Also, the effect of Ca: NH4 ratio in the rhizosphere of hydroponically-grown sour orange seedlings (SO) (Citrus aurantium L.) was studied in relation to the plants vegetative growth and N uptake.
Eight applications of 83 mM urea containing 0, 10.4, 20.8, or 41.5 mM CaCl2 were applied as a foliar spray to RD seedlings at 10 d intervals.
Control plants were sprayed with nanopure water.
Although foliar treatments with urea resulted in increased total leaf area, and leaf, stem, and root dry weight, the addition of CaCl2 did not increase the response.
However, the presence of CaCl2 in the spray solution significantly increased concentrations of N in stems and roots suggesting that CaCl2 enhanced translocation of foliar-applied nitrogen to these tissues.
The calculation of total N uptake by plants provided no evidence, however, of stimulated N uptake due to CaCl2 presence in the foliar spray solution.
SO seedlings were grown for six weeks in nutrient solutions in which all N was exclusively provided as ammonium ion with CaCl2:NH4 molar ratios of 1.0, 1.3, 1.6, 1.9, 2.2 and 2.5. The level of Ca: NH4 ratio had no effect on SO vegetative growth as measured by total leaf area, as well as leaf, stem, and root dry weight.
At the Ca: NH4 ratio of 1.3, however, the plants tended to have higher N concentrations in lateral and tap roots compared to those exposed to Ca:NH4 ratios of 1:1, 1.6, 1.9, 2.2, or 2.5. Since the growth of these plants was equal to that in the other treatments, this result may also suggest the enhanced N uptake.
Authors
D. Swietlik
Keywords
Ca/N interaction, foliar N absorption, foliar urea, calcium chloride sprays CaCl2:NH4 soil ratios
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