The effect of nitrogen on the formation of the anisophylly on the terminal shoots of apple trees

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Abstract
The anisophylly on the terminal shoots of apple trees has been widely observed in various varieties (4) and it has been recognized that the normal form of this anisophylly is independent of soil moisture in natural conditions(3). This form is expressed as follows : there appears the 1st maximum leaf at about the 9th leaf numbered from the base of the shoot, the very small leaf at about the 13th leaf, and 2nd maximum leaf at about the 17th leaf, and plotting leaf-area/leaf-position curve the form makes a double-peak-curve. The authors presumed from the seasonal cycle of nutriments in the trees, that the appearance of this normal form which had the small leaf at the middle of the shoot, might have been attributed to the conversion of nutrient supply sources, viz., conversion from the so-called 1st to the 2nd-growth stage, the former controlled mainly by the reserved nutriments in the previous year, and the latter controlled by the nutriments supplied in the current year (2).

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