NDLI: Interactions between ammonium and pH of the nutrient solution supplied to gerbera (Gerbera jamesonii) grown in pumice

Content Provider	Springer Nature Link
Author	Savvas, D. Karagianni, V. Kotsiras, A. Demopoulos, V. Karkamisi, I. Pakou, P.
Copyright Year	2003
Abstract	The interactions between the NH$_{4}$-N/total-N supply ratio (N $_{r}$) and the pH of the nutrient solution delivered to the plants regarding the nutrient availability and its influence on plant growth and yield were investigated in a gerbera crop grown in pumice. Four treatments obtained by combining a low and a high N $_{r}$ (0.02 and 0.13 on a molar basis, respectively) with two different levels of nutrient solution pH (5.0 and 5.8, respectively) were compared in a long-term glasshouse experiment. The low N $_{r}$ resulted in significantly higher pH levels in the rhizosphere, as indicated by the values measured in the drainage water. A high nutrient solution pH further increased pH in the root zone at low N $_{r}$ but had no influence on it at the higher N $_{r}$ level. The high pH in the root zone restricted significantly the Cu, Mn, and Zn uptake as indicated by both analytical results and visual symptoms, which were typical for Cu- and Mn-deficiencies. Mn-deficiency was induced only when a low N $_{r}$ was combined with a high nutrient solution pH. The Cu-deficiency symptoms appeared earlier, were more severe and occurred also when the low N $_{r}$ was combined with a low nutrient solution pH, but to a lesser extent. As a result of these nutrient deficiencies, both the growth and the flower yield were severely restricted when N $_{r}$ was low. These results indicate that gerbera is prone to Cu- and Mn deficiencies at pH values above 6 in the rhizosphere. The maintenance of root zone pH below this level in soilless culture is most successfully attained by properly adjusting the NH$_{4}$-N/total-N supply ratio rather than the pH of the nutrient solution delivered to the plants.
Starting Page	393
Ending Page	402
Page Count	10
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	254
Issue Number	2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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