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פותח על ידי קלירמאש פתרונות בע"מ -
Rhizosphere pH as a result of nitrogen levels and NH4/NO 3 ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)
Year:
2004
Source of publication :
Plant and Soil
Authors :
זילבר, אבנר
;
.
Volume :
262
Co-Authors:
Silber, A., Institute of Soils, Water and Environmental Sciences, Agric. Res. Org., Volcani Ctr., B., Israel
Yones, L.B., Southern RandD, Besor Exp. Stat., Mobile Post Negev 4, 85400, Israel, Israel
Dori, I., Southern RandD, Besor Exp. Stat., Mobile Post Negev 4, 85400, Israel, Israel
Facilitators :
From page:
205
To page:
213
(
Total pages:
9
)
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 NH4/NO3-N ratio in the irrigation water. In the second the rhizosphere pH was modified solely by altering the NH4/NO3-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 NH4/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.
Note:
Related Files :
crop adaptation
fertigation
Growth
Mn toxicity
nitrogen
Ozothamnus diosmifolius
pH
rhizosphere
rice
Zinc
Zn deficiency
עוד תגיות
תוכן קשור
More details
DOI :
10.1023/B:PLSO.0000037042.32687.95
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
28354
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:38
Scientific Publication
Rhizosphere pH as a result of nitrogen levels and NH4/NO 3 ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)
262
Silber, A., Institute of Soils, Water and Environmental Sciences, Agric. Res. Org., Volcani Ctr., B., Israel
Yones, L.B., Southern RandD, Besor Exp. Stat., Mobile Post Negev 4, 85400, Israel, Israel
Dori, I., Southern RandD, Besor Exp. Stat., Mobile Post Negev 4, 85400, Israel, Israel
Rhizosphere pH as a result of nitrogen levels and NH4/NO 3 ratio and its effect on zinc availability and on growth of rice flower (Ozothamnus diosmifolius)
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 NH4/NO3-N ratio in the irrigation water. In the second the rhizosphere pH was modified solely by altering the NH4/NO3-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 NH4/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.
Scientific Publication
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