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. I.
Forms of Nitrogen Fertilizer and Kinds of pH Adjusting Agent
E. YUDAS. OKAMOTO
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1965 Volume 34 Issue 3 Pages 177-186

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Abstract

1) The suitable soil pH for the growth of Citrus unshiu was observed with one-year-old trees of Sugiyama strain, by growing them on soils of various pH values and by giving them nitrogen fertilizer in the form of NH4-N or NO3-N. For the adjustment of soil pH, two different combinations of agents such as calcium hydroxide and dusting sulfur (Ca-S), and barium hydroxide and sulfuric acid (Ba-SO4) were used.
2) The growth of citrus plants grown on any soil adjusted by Ca-S were better than that of by Ba-SO4. Those received NH4-N generally made a better growth than those received NO3-N in both combinations of pH adjusting agents. The suitable pH for the growth of the former is a little higher than that of the latter.
3) Exchangeable Ca and Mg in the soil decreased as the soil pH values decreased, but there were no marked differences with respect to other elements as a result of the treatments.
4) The pH values for the highest accumulations of N, P, K, Ca and Mg were higher in the plants received NH4-N than those received NO3-N. Mn in the plants was mostly found in leaves and roots, especially, in fine roots. The accumulation of this element in both NH4-N and NO3-N became greater as the soil pH values decreased.

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