| 摘要 |
The composition has a dry weight of 750 to 850 g/l, it assays 13.5-16.5% of urea nitrogen and 5.5-7.5% (by weight) of phosphorus. In a preferred form, it contains, in addition, certain proportions of ammonia nitrogen, sulphur, zinc, manganese, copper, iodine and cobalt. The composition is prepared by mixing, in the weight ratios corresponding to the above levels, urea phosphate and urea and by dissolving them in water; for the preferred composition, ammonium sulphate and the sulphates of the trace elements mentioned are added. The composition can be advantageously used with cellulosic vegetables low in nitrogen and phosphorus. |
