NDLI: Rhizosphere pH as a result of nitrogen levels and NH$_{4}$/NO$_{3}$ ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)

Content Provider	Springer Nature Link
Author	Silber, A. Yones, L. Ben Dori, I.
Copyright Year	2004
Abstract	The effect of modification of the rhizosphere pH, via solution-N concentration and source, on rice flower (Ozothamnus diosmifolius, Astraceae) growth was investigated in two different experiments. In order to simulate a wide range of pHs easily, the plants were grown in an inert artificial substrate (perlite). In the first the rhizosphere pH was modified through variation of N concentrations and the NH$_{4}$/NO$_{3}$-N ratio in the irrigation water. In the second the rhizosphere pH was modified solely by altering the NH$_{4}$/NO$_{3}$-N ratio while irrigation-N concentration was held at the level found to be optimal in the first experiment. Cultivation of rice flower, a new crop in Israel, is hampered by lack of knowledge on its Zn nutrition. Because availability of soil Zn largely depends on pH we investigated in the second experiment the effect of Zn foliar application. The growth of rice flower plants under low-N fertilization or low NH$_{4}$/NO$_{3}$-N ratio was poor and the plants exhibited growth disorders such as tipburn, severe chlorosis and necrosis. These growth disorders could not be ascribed to any direct effect of N nutrition therefore it was suggested that the indirect effect of the treatments, e.g., the rhizosphere pH dominates rice flower growth through its effect on nutrient availability. The only nutrient that was significantly correlated with pH and yield parameters in both experiments was Zn. All irrigation-nutrients concentrations were within the recommended range for hydroponically grown plants; however, the leaf-Mn concentration of plants grown in pH above 7.5 was in the toxic range while that of Zn was deficient. The high preferential uptake of Mn over Zn by rice flower plants and the question of whether high Mn uptake induced Zn deficiency remain open.
Starting Page	205
Ending Page	213
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	262
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
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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