Relation between the Saturation Degree of Exchangeable Calcium, Potassium and Magnesium of Soil and the Growth of the Tea Plant (Part 4):Effect of Saturation Degree of Exchangeable Calcium of Soil on the Mineral Contents of New Leaf, Mature Leaf Old Leaf
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The effects of saturation degree of exchangeable Ca of soil on the mineral contents of new leaf, mature leaf, old leaf and young stem of tea seedlings were investigated by a pot experiment.<BR>The seedlings (Yabukita variety) were planted in Makinohara plateau yellow soil having, various saturation degree of Ca (2.3, 25, 50, 100%), K (5%), and Mg (5%).<BR>The order of N and K contents of each part was new leaf> mature leaf> old leaf>younj stem and that of P was new leaf> young stem mature leaf > old leaf.<BR>The effects of saturation degree of exchangeable Ca on the N, P and K contents of each part were not clear.<BR>The order of Mg content of each part was old leaf >new leaf >mature leaf>young stem in the range from 2.3% to 25% of the saturation degree of exchangeable Ca in the soil, but in the soils having more than 5000 exchangeable Ca, the order was new leaf> mature leaf> old leaf>young stem.<BR>Increasing saturation degree of exchangeable Ca decreased Mg content of each part. The order of Ca, Mn and Al contents of each part was old leaf > mature leaf > new leaf > young stem.<BR>Increasing saturation degree of exchangeable Ca remarkably increased Ca content of the old and mature leaves and slightly increased Ca content of the new leaf, but remarkably decre-ased Mn and Al contents of the old leaf and slightly decreased Mn and Al contents of new leaf.
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