Berges, R., Rott, M. and Seemüller, E. (2000): Range of phytoplasma concentrations in various plant hosts as determined by competitive polymerase chain reaction. Phytopathology 90, 1145–1152.
Range of phytoplasma concentrations
A method is proposed by which the significance of the differences between trace element concentrations of sample and control
can be estimated without detailed knowledge of the distribution in the total population. Both sample and control are cut in
half and the trace element concentrations of all four pieces are determined. The concentration values of the two halves of
each sample are compared with each other and so are the concentration values of the two samples. This cross-comparison is
essentially the application of Student's t-test to the smallest possible number of data. The calculation is reduced to a simple
formula, and tables of confidence limits are not needed. The implications of lack of general background knowledge are discussed.
Since it cannot always be known whether a certain trace element follows a normal or log-normal distribution pattern, or whether
simultaneously determined concentrations of several trace elements are correlated with each other, the most cautious estimate
of the significance is recommended.
Authors:X. Lu, X. Tian, A. Zhao, J. Cui, and X. Yang
Kalayci, M., Torun, B., Eker, S., Aydin, M., Ozturk, L., Cakmak, I. 1999. Grain yield, zinc efficiency and zinc concentration of wheat cultivars grown in a zinc-deficiency calcareous soil in field and greenhouse. Field Crops Res. 63 :87
Authors:M. Rastija, V. Kovacevic, D. Rastija, and D. Simic
., Schnug, E., Haneklaus, S., Simic, D. (1997): Genetic and environmental influences on micronutrients concentrations in maize ( Zea mays L.) plants. pp. 209–214. In: van Cleemput, O., Haneklaus, S., Hofman, G., Schnug, E., Vermoesen, A. (eds
Rice plants were grown in an experimental field and separated at harvest into different components, including polished rice,
rice bran, hull, straw and root. The distribution of chlorine in these components was determined by instrumental neutron activation
analysis. The concentration of chlorine in the roots was the highest (4800 mg·kg−1 dry wt.) and that in the polished rice was the lowest (140 mg·kg−1 dry wt.) among the plant components. The content of chlorine in the polished rice was about 2% of the entire plant, and the
rest was present in the inedible portions; about 75% of the total chlorine content was in the straw. The percentage of chlorine
removed from the surface soil layer to the above ground biomass of the rice plants was calculated as 5% every year. The chlorine
concentrations in leaf blades of different positions collected from four growing stages varied by more than one order of magnitude,
and were well correlated with the sum concentrations of major cations (potassium + calcium + magnesium). This may be attributed
to the fact that the translocation rate of chlorine among the leaf blades with age depends on the concentrations of the major