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Schmehl等人观察到,在一种酸性粉砂壤土上,表层施石灰后,植株体内约80％的钙来自复盖酸性土壤的石灰层。Blume等人发现,植株从无机盐肥料中所得的钙,仅占2—6％。Tirie等人指出,紫花苜蓿从碳酸盐态的钙中所吸取的钙较之从磷酸盐或硫酸盐态的钙盐中所吸取的钙更多一些。本研究的目的在于根据应用不同数量标记的钙盐被作物所吸收的放射性的钙,来评不同钙沅的优点。
Schmehl et al. Observed that on an acidic silty loam soil, about 80% of the calcium in the plant body comes from the lime layer that covers the acidic soil after the surface lime is applied. Blume et al. Found that only about 2-6% of the calcium is obtained from inorganic fertilizer in plants. Tirie et al. Point out that alfalfa draws more calcium from carbonate calcium than calcium from phosphate or sulfate salts. The purpose of this study was to evaluate the advantages of different calcium salts based on the use of radioactive calcium absorbed by the crop with varying amounts of labeled calcium salts.