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The nitrogen, potassium, phosphorus, calcium, magnesium, sodium, manganese, iron, copper, boron, zinc, molybdenum, and aluminum contents of tea leaves of increasing age



The nitrogen, potassium, phosphorus, calcium, magnesium, sodium, manganese, iron, copper, boron, zinc, molybdenum, and aluminum contents of tea leaves of increasing age



Tea Quart 36(3): 122-136



In many crops the nutrient contents of the leaves or other organs have been analyzed. This is done firstly to determine the actual contents of nutrients and secondly, to see whether fluctuations occur under the influence of differing environmental conditions and cultural practices. For instance, by analyzing the N, P and K contents of the leaves and branches of tea plants Eden (1958) was able to calculate how much N, P and K were removed in crop and prunings. In this study the contents of 13 elements have been determined in tea leaves of increasing age. It is well known that the content of elements like N, K and Mg in leaves of other plants decreases with increasing leaf age. The Mg figures were obtained by a spectrographic technique of which the details are not known. Assuming that they are valid then the tea bushes under investigation appear to accumulate Mg in the old leaves instead of in the young ones. This apparent trend will be studied further because it may be an indication that the plant takes up amounts of Mg in excess of its requirements. Such a condition is often referred to as luxury consumption and it may well be that too much Mg is applied in the fertilizer mixture.

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