Mineral composition of two populations of leaves - green and iron chlorotic - of the same age all from the same tree
Since carefully washed Fe chlorotic leaves often contain more total Fe on the dry weight basis than do green leaves, a population of leaves of the same age representing chlorotic leaves from each of two lemon trees and green leaves also of the same age and from the same two trees were analyzed individually for mineral elements to determine, especially, the frequency distribution of Fe in the various groups of leaves (n = 47, 48, 71, 48). The chlorotic leaves from one tree had mineral composition typical of lime-induced chlorosis. The chlorotic leaves for this tree were, on the average, higher in P, K, and Fe and lower in Ca than the green leaves. For the other tree the chlorotic leaves appeared to be truly Fe deficient; P was not higher in these leaves but the mean K and Ca showed the same pattern as in the first tree. Zinc was higher in the deficient leaves than in the green ones on this tree which can be expected for true Fe deficiency. Mean zinc levels were below the critical levels. Mean manganese was below the critical level for all groups. The coefficient of variation for each element in each group was usually around 30%. Maximum-minimum data indicated that many individual leaves did not fit the patterns just described. Correlation coefficients indicated that most major patterns were consistent in spite of the variability, although there were some differences. The frequency distribution for each of most elements was much like a normal curve with usually a three-fold range for each of the elements. Many of the Fe-deficient leaves had more Fe than some of the green leaves. Analysis of an individual leaf, therefore, cannot result in accurate description of lime-induced chlorosis.
- Research Organization:
- California Univ., Los Angeles (USA). Lab. of Biomedical and Environmental Sciences
- DOE Contract Number:
- AC03-76SF00012
- OSTI ID:
- 5608283
- Report Number(s):
- UCLA-12-1342; CONF-8108109-2; ON: DE82005445
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
553000 -- Agriculture & Food Technology
59 BASIC BIOLOGICAL SCIENCES
60 APPLIED LIFE SCIENCES
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
DATA
ELEMENTS
EXPERIMENTAL DATA
FRUIT TREES
INFORMATION
IRON
LEAVES
METALS
NUMERICAL DATA
NUTRITIONAL DEFICIENCY
PLANTS
TRANSITION ELEMENTS
TREES
VARIATIONS