| Composting turns household wastes into valuable fertilizer and soil organic matter. |
| Add additional nutrients throughout the growing season by dissolving a water-soluble fertilizer in the watering can once every week or two. |
| Seven grams of fertilizer were applied once every two weeks to each flat and all seedlings were maintained in the greenhouse. |
| Farms use chemical fertilizers, hybrid seeds and artificial insemination and weedicides. |
| The chief sources of phosphorus in river water are the weathering of rocks and the leaching out of fertilizers from agricultural land. |
| We also account for the disposal of waste water polluted by fertilizers, as well as by pesticides and herbicides. |
