Journal of the Japanese Society for Horticultural Science
Online ISSN : 1880-358X
Print ISSN : 0013-7626
ISSN-L : 0013-7626
The effect of soil reaction on the growth of young citrus plants. III
Level of phosphorus application
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1968 Volume 37 Issue 1 Pages 45-50


1. In order to determine the effect of phosphorus application in connection with soil reaction, an experiment, which consisted of factorial combinations of three levels of phosphorus (Ca(H2PO4)2) and four levels of soil pH, was carried.
2. Regardless of the level of phosphorus application, the favorable soil pH for the growth of plant based on shoot growth and net increase of fresh weight was around 6.
3. With increasing the P-level, the P2O5 concentration in the soil increased naturally, especially at lower pH 4-5.
4. Shoot growth was not affected by the phosphorus application, while net increase of fresh weight was only slightly increased by it.
5. However, insoluble and soluble organic-P in a whole plant, and soluble-N and especially insoluble-N (mainly protein-N) in the leaves were increased by raising the P-level.
6. Therefore, though the phosphorus application did not affect the external growth of plant, it seemed to be related to syntheses of organic N and P compounds.

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