| 摘要 |
In the manufacture of a fertiliser for hydroponics which contains plant nutrient salts and calcium sulphates, a mixture of water-soluble plant nutrient salts, which in addition to the principle nutrients N, P, K and Mg, also contain the trace nutrients Fe, Mn, Cu, Zn, Co and under 20 per cent by weight of calcium sulphate relative to 100 per cent by weight of plant nutrient salts, and of a binder is compressed into tablet form. |
