Article Figures & Data
Figures
- Fig. 1.
A pin oak showing advanced symptoms of chlorosis, or yellowing, of the foliage. Systemic treatment with an iron compound generally corrects the iron deficiency for about three years.
- Fig. 2.
A 3 ml plastic syringe with the tip end removed to facilitate loading with powdered ferric citrate.
Tables
- Table 1.
Response of six tree species on the University of Illinois campus to treatments with ferric citrate powder.
Tree species Number of trees Average dbh (inches) Color Rating3 Initial Final Difference Pin oak1 5 6 2.2 7.9 5.7 Control 3 6 2.2 2.8 0.8 Pin oak2 8 16 5.2 6.9 1.7 Control 10 15 3.8 3.6 — 0.2 Bald cypress2 5 18 4.3 7.7 3.4 Control 3 24 3.0 3.7 0.7 Red oak2 3 8 5.2 7.3 2.1 Control 2 10 7.0 7.0 0.0 Swamp white oak2 15 6 6.6 7.0 0.4 Control 13 6 7.1 6.1 — 1.0 Sweet gum2 7 10 6.5 8.4 1.9 Control 4 17 6.0 6.3 0.3 American sycamore2 2 12 5.0 6.3 1.3 Control 3 15 6.0 7.0 1.0 Treatment Number of trees Color rating1 Twing growth (inches) 1978 May 1977 July 1977 July 1978 July 1979 Ferric citrate2 32 4.5 7.4 7.7 6.5 6.8 Ferric ammonium citrate3 14 5.3 7.1 7.1 6.4 6.9 Ferric ammonium citrate + NPK4 14 4.6 7.0 7.1 7.2 6.6 Ferric ammonium citrate + N5 10 4.6 5.9 5.7 5.3 5.7 NPK6 10 6.2 6.6 7.1 6.6 4.6 NPK + slow-release N7 6 5.2 5.8 6.6 5.4 4.8 N (slow-release)7 11 6.0 6.1 6.2 5.9 4.3 Control 12 5.7 6.3 6.3 5.8 4.3 Average tree size: 13.2 in dbh (range 4-24 in).
↵1 Color code: 1-6, shades of yellow: 7-10, shades of green; 10, dark green.
↵2 Purified powder form, 1 ½ g/ho)e, holes 4 in (10 cm) apart.
↵3 Medicap Fe28, size 0, 3/8 in (1.1 cm), trees 4-11 in (10-28 cm) dbh; size 000,0.5 in (1.27 cm) in larger trees.
↵4 Medícap formulation of Fe + soluble NPK, size 000 in trees 4-11 in dbh and size 11/16 in (2.1 cm) in larger trees.
↵5 Medicap formulation of Fe28 and slow-release N, size 0 in trees 4-11 in dbh and size 000 in larger trees.
↵6 Medicap formulation with soluble NPK alone, size 0 in trees 4-11 in dbh and size 000 in larger trees.
↵7 Medicap formulation with slow-release N only, size 0 used in trees 4-11 in dbh and size 000 in larger trees.
8 Medicap formulation of slow-release N, size 000 used in trees 4-11 in dbh and 11/16 in cartridge in larger trees.
Treatment Number of trees Color rating1 Twig growth (inches) 1978 May 1977 July 1977 July 1978 July 1979 Ferric citrate2 11 6.3 8.7 8.3 7.4 9.0 Ferric ammonium citrate3 10 6.1 8.1 8.0 7.1 8.6 Ferric ammonium citrate + NPK4 10 6.7 8.3 8.0 7.8 7.8 Ferric ammonium citrate + N5 10 6.3 8.1 7.9 6.7 7.1 NPK6 10 6.6 8.3 8.1 7.3 6.4 NPK + slow-release N7 6 6.5 8.1 7.8 7.0 6.0 N (slow-release)7 9 5.7 7.1 6.8 6.6 5.5 Control 11 6.4 7.6 7.7 6.6 5.2 Average tree size: 12.0 in dbh (range 5-33 in).
↵1 Colorcode: 1-6, shades of yellow; 7-10, shades of green; 10, dark green.
↵2 Purified powder form, 1¼ g/hole, holes 4 in (10 cm) apart.
↵Medicap Fe28, size 0, 3/8 in (1.1 cm), trees 4-11 in (10-28 cm) dbh; size 000, 0.5 in (1.27 cm) in larger trees.
↵4 Medícap formulation of Fe + soluble NPK, size 000 in trees 4-11 in dbh and size 11/16 in (2.1 cm) in larger trees.
↵Medicap formulation of Fe28 and slow-release N, size 0 in trees 4-11 in dbh and size 000 in larger trees.
↵5 Medicap formulation with soluble NPK alone, size 0 in trees 4-11 in dbh and size 000 in larger trees.
↵7 Medicap formulation with slow-release N only, size 0 used in trees 4-11 in dbh and size 000 in larger trees.
8 Medicap formulation of slow-release N, size 000 used in trees 4-11 in dbh and 11/16 in cartridge in larger trees.
Treatment Number of trees Color rating Color increase 6/78 8/78 8/79 1st year 2nd year Ferric ammonium citrate 26 5.4 6.1 6.4 0.7 1.0 Manganese sulfate 7 5.6 6.2 6.4 0.5 0.8 Control 10 3.9 4.0 4.8 0.1 0.9 Average tree size: 20.8 in dbh (range 14-30 in).
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