| In the 1840s they initiated the manufacture of superphosphate fertilizer, one of their inventions. |
| Mined rock phosphate may be used but its manufactured derivative superphosphate may not. |
| Work some superphosphate into the soil about a foot from the base of the plant. |
| As your sweet peas begin to grow, sprinkle a little superphosphate over the bed and water well in. |
| To give your Agapanthus a boost, sprinkle a handful of superphosphate around each clump in early spring. |
| It's because of the use of superphosphate that improves the pasture but discourages mushrooms. |
