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KMID : 0903619770180020162
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Journal of the Korean Society for Horticultural Science
1977 Volume.18 No. 2 p.162 ~ p.172
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Influences of Ca++ , Mg++ , and pH in solution on growth and uptakes of N , P , K , Ca , and Mg in garlic plants (Allium sativum L.)
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Abstract
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Effects of Ca, Mg, and pH in solution on growth and ion uptake in late garlic (Allium satium L.) were investigated by waterculture.
Ca deficiency symptom such as necrotic spots and Mg deficiency symptom such as chlorosis started to appear at the stages of 5-6 and 6-7 leaf blades respectively. Increase of Ca concentation to 12 meq. /1 accelerated plant growth and produced higher yield, but that of Mg to 8meq. /1 decreased plant growth and yield. pH from 5.0 to 7.0 showed little effect on plant growth and yield.
Plants grown in Mg depleted solutions showed increases of total N, P, and K uptakes, but in the Mg supplied solutions their uptakes were decreased. Ca had no effect on their uptakes when Mg was supplied, but decreased their uptakes in case of Mg non-supply.
The increase of Ca concentration accelerated the Ca uptake, but Mg depressed it. Mg uptake increased with the increase of Mg^(++) in solution, but it was not affected by Ca. Increase of solution pH from 5.0 to 7.0 showed decrease of Ca uptake, but little effect on the uptakes of other ions.
The accumulations of N and P in the Mg deficient plants strikingly increased, and that of K showed a little difference. Ca and Mg reduced the accumlations of Mg and Ca respectively in some parts of the plant, but not in others. All parts of the Mg deficient plants showed a similar Mg content of 0.04% on dry weight basis.
The pH had no influence on the accumulations of N, P, K, and Mg, but Ca accumulation increased with the increase of the pH from 5.0 to 6.0, and decreased with the increase of it from 6.0 to 7.0.
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