HGRH Fertilizer Formulation
The following information can be cut/pasted into a publications with
very little modification. The units such as "mg/L" will need
to be rewritten to scientific notation, but this webpage does not support
superscript text. Also, your text may need to address how often plants
were fertilized. The formulation changed in 2009-2010, but remained
nearly identical in N-P-K and pH. Please note dates each formulation
was used:
8/1/10 - present
Plants were irrigated as necessary with acidified water supplemented
with a combination of two water-soluble fertilizers (3:1 mixture of
15N–2.2P–12.5K and 21N–2.2P–16.6K, respectively;
The Scotts Co., Marysville, OH) to provide the following (in mg/L):
200 N, 26 P, 163 K, 50 Ca, 20 Mg, 1.0 Fe, 0.5 Mn and Zn, 0.24 Cu and
B, and 0.1 Mo. Nitrate form was 76% of nitrogen provided. Irrigation
water was supplemented with 93% sulfuric acid (Brenntag, Reading PA)
at 0.08 mL/L to reduce alkalinity to 100 mg/L and pH to a range of 5.8
to 6.2.
10/15/09 – 5/31/10
Plants were irrigated as necessary with acidified water supplemented
with water-soluble fertilizer (15N–1.3P–13.3K; Greencare
Fertilizers, Kankakee, IL) to provide the following (in mg/L): 200 N,
17 P, 176 K, 40 Ca, 27 Mg, 1.0 Fe, 0.5 Mn and Zn, 0.24 Cu and B, and
0.1 Mo. Irrigation water was supplemented with 93% sulfuric acid (Ulrich
Chemical, Indianapolis, IN) at 0.08 mL/L to reduce alkalinity to 100
mg/L and pH to a range of 5.8 to 6.2.
6/1/10 – 7/31/10
Plants were irrigated as necessary with acidified water supplemented
with water-soluble fertilizer (21N–2.2P–16.6K; The Scotts
Co., Marysville, OH) to provide the following (in mg/L): 200 N, 20 P,
158 K, 1.0 Fe, 0.5 Mn and Zn, 0.24 Cu and B, and 0.1 Mo. Irrigation
water was supplemented with 93% sulfuric acid (Ulrich Chemical, Indianapolis,
IN) at 0.08 mL/L to reduce alkalinity to 100 mg/L and pH to a range
of 5.8 to 6.2.
3/1/98-10/14/09
Plants were fertilized as necessary with acidified water supplemented
with 15N–2.2P–12.5K water-soluble fertilizer (Excel Cal-Mag;
Scotts, Marysville, OH) to provide the following (in mg/L): 200 N, 29
P, 167 K, 67 Ca, 27 Mg, 1.0 Fe, 0.5 Mn and Zn, 0.24 Cu and B, and 0.1
Mo. Irrigation water was supplemented with 93% sulfuric acid (Ulrich
Chemical, Indianapolis) at 0.08 mL/L to reduce alkalinity to 100 mg/L
and pH to a range of 5.7 to 6.3.
Irrigation Solution Analyses
Substrate Analyses
Soil Labels
Fertilizer Labels