火山灰土壌に生育する果樹に対する珪カルの肥効について-3-表層の黒色土ならびに下層の黄褐色土に植えられたリンゴおよびモモの幼樹に対する珪カルの肥効
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Effects of application of slag, lime and magnesia on the pH, the content of available phosphoric acid, and the absorption coefficient of phosphoric acid of black soil and yellowish brown soil both originated from allitic volcanic ash were investigated. Effects of these fertilizers on the tree growth and the nutrient content in leaves of apples and peaches planted in the pots with these soils were also observed. 1. Soil pH values in each treatment were higher in the yellowish brown soil than in the black soil. In the both soils, the soil pH in the slag treatment was lower than in the lime plus magnesia treatment, though the same amounts of lime and magnesia were supplied in the both treatments. By application of slag, lime and magnesia, content of available phosphoric acid in the soil was increased, but absorption coefficient of phosphoric acid was slightly decreased. 2. In the both soils, tree growth of apples and peaches, and flower bud formation of peaches were most superior in the slag treatment. In the trees of the control, to which no lime and magnesia were supplied, and in those of the lime treatment, to which no magnesia was supplied, considerable defoliation occurred in summer owing to magnesium deficiency in the both species. In the lime and the lime plus magnesia treatments to the yellowish brown soil, shoot growth of the both species was retarded owing to boron deficiency. 3. As the result of leaf analysis in apples, it was found that when magnesium was not supplied magnesium content of leaves was remarkably low in the both soils. Also, it seemed that boron content decreased with the rise of soil pH. Especially, it was very low in the lime and the lime plus magnesia treatments to the yellowish brown soil.
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