Colorado State University

Greenhouse Research
On the benefits of ODC (Organically Derived Colloidals)
Nature's natural Plant Growth Promoter and Enhancer

Potting Soil and Treatment Preparations
Fungus pathogens are added to the soil prior to the potato plantings ODC treatments are measured and applied to the innoculated pots containing potatoes
Under the direction of Dr. Jim Linden the pathogen (Verticillium Dahlae) is added to potting soil used for the ODC experiments. Certified Russet Burbankminitubers are planted in pots containing sterile and infected soil at CSU's greenhouse.  Dr. Linden directs students as how to measure and apply the exact ODC treatments to the pots. The table on the left contains pots with the infected soil. The table on the right contains normal sterile potting soil. Both received ODC treatments. The control group, center row of each table receives water only. No nutrients or insecticides are used during the experiment.


Potato (minituber) Plantings
 Potato plants after several weeks. On the front table all pots are infected with a soil pathogen, Verticillium Dahlae. The white tag is control group while the blue & green tags both indicate ODC treated rows. The center row of each table contain the control groups. Controls receive water only. The rows on either side are watered with an ODC solution.  See close up --> Close up: A side view of the two outside rows of ODC treated plants. The control group is seen in the third row back.   Each plant  receives the same level of moisture & light. Plants are allowed to grow until maturity.  Samples are taken weekly.


Daughter Potato Harvest
By the end of the season the plants from both tables are combined for this comparison photo. The group in the rear,
next to Dr. Linden, contain the pathogen infected pots. The test layout is the same as the previous photos, i.e., ODC treated plants are in each of the two outside rows - on either side of the controls (center row).
The potato plants are carefully pulled from the pots exposing the daughter tuber harvest.  Note: Yellowing of
the leaves indicates the potato plants are at the end of their
normal growing season. 
Daughter tubers from each pot are counted. The data from the treatments and controls from both the infected and normal soil are statistically analyzed (see table below). Each sample is placed into a paper bag for pathogen analysis.


Results of ODC Treatments

In the normal soil ODC treated plants had a 27.84% 
increase in daughter tuber yields over the control group.
(*Values are statistically different at P=0.01) 
ODC treated plants grown in infected soil had a 35.37%
increase in daughter tuber yield vs the control group.
(^Values are statistically different at P=0.01)



A statisical comparison was also made of the how the
plants performed between those grown in the normal 
soil and those grown in infected soil.  The control groups of 
from the infected soil produced 24.29% less daughter
tubers than those harvested from the normal soil.
(Values are statistically different at P=0.01)

Also see  related :
ODC treatments on vegetables and flowers
Biocontrol Brochure
Order ODC for your garden and houseplants 

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