Table 1. Medium formulation comparison of DCR vs. mDCR.
| Macronutrient | |||
|---|---|---|---|
| Molecular formula | Compound name | Amount to add (mg/L) | |
| DCR | mDCR | ||
| KNO 3 | Potassium nitrate | 340.000 | 1000.000 |
| (NH 4) 2SO 4 | Ammonium sulfate | - | 200.000 |
| KCl | Potassium chloride | - | 300.000 |
| MgSO 4 · 7H 2O | Magnesium sulfate heptahydrate | 370.000 | 250.000 |
| CaCl 2 · 2H 2O | Calcium chloride dihydrate | 85.000 | 150.000 |
| NaH 2PO 4 · H 2O | Sodium phosphate monobasic monohydrate | - | 90.000 |
| Na 2HPO 4 · 7H 2O | Sodium phosphate dibasic heptahydrate | - | 30.000 |
| Ca(NO 3) 2 · 4H 2O | Calcium nitrate tetrahydrate | 556.000 | - |
| KH 2PO 4 | Potassium dihydrogen phosphate | 170.000 | - |
| NH 4NO 3 | Ammonium nitrate | 400.000 | - |
| Micronutrient | |||
| ZnSO 4 · 7H 2O | Zinc sulfate heptahydrate | 8.600 | 3.000 |
| H 3BO 3 | Boric acid | 6.200 | 3.000 |
| CuSO 4 · 5H 2O | Cupric sulfate pentahydrate | 0.250 | 0.125 |
| FeSO 4 · 7H 2O | Ferrous sulfate heptahydrate | 27.800 | 13.900 |
| MnSO 4 · H 2O | Manganous sulfate monohydrate | 22.300 | 5.300 |
| C 10H 14N 2Na 2O 8 · 2H 2O | EDTA disodium salt dihydrate | 37.300 | 18.700 |
| KI | Potassium iodide | 0.830 | 0.375 |
| CoCl 2 · 6H 2O | Cobalt chloride hexahydrate | 0.025 | 0.125 |
| Na 2MoO 4 · 2H 2O | Sodium molybdate dihydrate | - | 0.125 |
| NaMoO 4 · 2H 2O | Sodium molybdenum oxide dihydrate | 0.250 | - |
| NiCl 2 | Nickel(II) chloride | 0.025 | - |
| Vitamin | |||
| C 6H 12O 6 | myo-Inositol | 200.000 | 1.000 |
| C 6H 5NO 2 | Nicotinic Acid | 0.500 | 0.100 |
| C 12H 17ClN 4OS · HCl | Thiamine HCl | 1.000 | 1.000 |
| C 8H 11NO 3 · HCl | Pyridoxine HCl | 0.500 | 0.100 |
| NH 2CH 2COOH | Glycine | 2.000 | - |
Note: Douglas-fir cotyledon revised media (DCR, Gupta & Durzan, 1985, Gupta & Durzan, 1987a); modified Douglas-fir cotyledon revised media (mDCR)