Substrate pH ranges for greenhouse crops grown in a soiless substrate (Bailey, D.A., Fonteno, W.C., Nelson, P.V. Greenhouse substractes and fertilization. Department of Horticultural Science, NCSU).
Species |
pH |
Why? |
Celosia |
6.0 to 6.8 |
Prevent Fe & Mn toxicity |
Dianthus |
6.0 to 6.8 |
Prevent Fe & Mn toxicity |
General crops |
5.4 to 6.8 |
pH tolerant |
Geranium |
6.0 to 6.8 |
Prevent Fe & Mn toxicity |
Marigold (African) |
6.0 to 6.8 |
Prevent Fe & Mn toxicity |
Pansy |
5.4 to 5.8 |
Prevent B & Fe toxicity |
Petunia |
5.4 to 5.8 |
Prevent Fe & B toxicity |
Salvia |
5.4 to 5.8 |
Prevent Fe & Btoxicity |
Snapdragon |
5.4 to 5.8 |
Prevent Fe & B toxicity |
Vinca |
5.4 to 5.8 |
Prevent Fe & B toxicity |