| 摘要 |
1509894 Plaster of Paris foam STEETLEY CO Ltd 4 July 1975 [5 April 1974] 15141/74 Headings C1A and C1B A growing medium comprises a solid plaster of Paris foam with N, P, K sources dispersed therein, e.g. nitrates, urea, NH 4 <SP>T</SP> salts, dried blood, hoof and horn, phosphates, bone meal, basic slag and phosphoric acid. The foam may be cast to a desired shape, and may be contained by a receptacle, e.g. a wire basket. |
