| 摘要 |
1,271,575. Fertilizers comprising alginic acid/ alginate. GALDONOST DYNAMICS (N.Z.) Ltd. 22 July, 1969 [24 July, 1968], No. 36749/69. Heading C1B. A fertilizing composition in the form of a liquid or gel comprises fertilizer chemicals dissolved or dispersed in an aqueous alginic acid/alginate system at a pH of from 4À2 to 8, and optionally containing buffering agents such as K 2 HPO 4 or KH 2 PO 4 . After application to the locus of a plant and depending on the acidity or alkalinity of the soil, an alkaline material (sodium or potassium carbonate) may be added to increase the rate of release of fertilizer chemicals, or a heavy metal salt (e.g. Ca salt) may be added to stabilize the gel and slow the release rate. The examples give the pH of compositions containing urea, H 3 PO 4 , KOH, alginate, (KNO 3 ) and water.
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