EFFECT OF Ca IN THE MEDIUM ON ROOT GROWTH UNDER LOW pH CONDITIONS
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概要
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The effect of Ca in the medium on root growth was studied by using 15 cultivars under low pH conditions. The results are summarized as follows. (1) Soil culture-Root growth was analyzed by introducing the roots of each cultivar into two soils differently treated (combination of CaCO_3-soil and -Ca-soil or CaSO_4-soil and -Ca-soil). Roots generally grew well in the CaCO_3-soil. Under similar soil pH conditions (4.3-4.6) and with a high content of exchangeable Al in the combination of CaSO_4-soil and -Ca-soil, the root of many cultivars grew well in the CaSO_4-soil. These results suggest that in acid soil the presence of Ca in the medium exerts a beneficial effect on root growth. However, peanut and soy bean grew better in the -Ca-soil. (2) Solution culture-In the medium at a low pH (3.5) and/or at a low Ca concentration, the plants in which root growth was adequate usually contained large amounts of K in their roots. The relative root growth of all the plants improved with the increase of the Ca concentration in the medium at a low pH. The K contents in the roots generally increased with the increase of the Ca concentration in the medium at a low pH. In the medium at a low pH, the value of the relative root growth correlated with the index of the K content in the roots of the dicotyledons and with the index of the Ca content in the roots of the gramineous crops at the 0.1 and 5% levels, respectively. (3) In both the soil and solution cultures under a low pH condition, the root growth of many plants was ameliorated by the increase of the Ca content in the medium, however, the roots of a few plants grew better in a medium with a low content of Ca.
- 一般社団法人日本土壌肥料学会の論文
著者
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Inoue Koichi
Hiroshima Agricultural College
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YOKOTA Hiroshi
Hiroshima Agricultural College
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YAMADA Yoshio
Institute of Postgraduate Studies in Agriculture