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Details van artikel 129 van 164 gevonden artikelen
| Titel: |
Soil variables vs. mineral analyses of citrus |
| Auteur: |
El-Gazzar, A. M. Wallace, A. Naguib, M. Romney, E. M. Alexander, G. V. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 8 (1977) nr. 2 pagina's 115-124 |
| Jaar: |
1977 |
| Inhoud: |
Leaf and root samples from 120 citrus trees, representing four species from each of six different locations in Egypt, were assayed for mineral elements with an emission spectrograph. The areas represented newly reclaimed lands as well as established orchards in the Nile River Delta. There were symptoms of Zn, Mn, and Fe deficiencies at some, but not all, of the locations. There was a negative correlation between root and leaf concentrations for Mg and positive correlations for B, Fe, P, and K. There were strong positive and negative correlations between plant concentrations of some nutrients and certain soil characteristics (percent soil organic matter, pH in paste, electrical conductivity on a saturation extract, and percent CaCO3). Stepwise regression analyses were therefore made among the soil and plant variables. This test indicated that the soil CaCO3 level was responsible for most of the variation in Fe, Mn, and Al in leaves. Soil organic matter or electrical conductivity of the saturation extract was responsible for most of the variability in major cation levels in leaves. Most of the variability in leaf P was due to soil pH rather than percent CaCO3. The stepwise regression suggested that the concentration of leaf Al accounted for some of the variability in leaf Mn; otherwise, no other element in leaves appeared in the stepwise regressions indicating that they were related to the soil variables and were not the result of nutrient interactions. Some fertilization and leaf analysis experiments have been conducted in Egypt in the past1,6; however, they did not give a complete picture in terms of areas and nutritional elements. Furthermore, citrus acreage in Egypt has been greatly expanded in recent years into newly reclaimed areas19,20. Citrus, therefore, is grown on a wide range of soil conditions which makes possible a study of leaf nutrient levels in relation to a range of soil conditions. The major purpose of this study was to use data collected from a wide range of citrus orchards to evaluate relationships between plant mineral analyses and soil analyses. A secondary purpose was to obtain data on the composition of citrus leaves and roots at the test locations which were not previously available. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 129 van 164 gevonden artikelen
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