January 2021 - 31

RESEARCH
To ensure that each pot received
the same amount of fertilizer,
containers were first filled with
1 gallon of substrate consisting
of pine bark and sand only at
the aforementioned ratio. This
substrate was then removed from
the container and placed in a
larger plastic container. Fertilizer
(36.5 g) was then weighed out
individually for each container
and added to the substrate, and
then thoroughly mixed before the
substrate was placed back into the
nursery container.
Topdressing was accomplished
by adding the entire allotment of
fertilizer to the substrate surface
after fully filling the container
with the substrate. Subdressed
containers were first filled with
the pine bark/sand substrate up
to 2 inches from the soil surface.
Fertilizer was weighed individually
for each container, and then
the entire allotment of fertilizer
was then applied evenly to the
substrate surface in a single layer.
After the addition of fertilizer,
the remaining 2 inches depth
of substrate was added so the
containers were completely filled.
Fertilizer was dibbled by first fully
filling the container with substrate.
A plastic pipe was used to make a
small hole in the substrate surface
that was 1 inch wide by 2 inches
deep. The entire allotment of
fertilizer was then added to this
hole, and substrate was placed
on top. Regardless of fertilizer
placement, each pot received
36.5 g of fertilizer.
A separate set of control pots
filled with only the pine bark/
sand substrate and containing no
fertilizer were used for comparison
to determine growth of each
species in the absence of fertilizer.
After being filled, all containers
were placed in the greenhouse
maintained between 70° and
95° F immediately after filling
and received 0.3 inches irrigation
daily for the remainder of the
experiment.
On June 18, 2018, 25 seeds
of eclipta [Eclipta prostrata (L.)
L.], large crabgrass [Digitaria
Figure 2. Eclipta growth in containers at 8 weeks after seeding at four different fertilizer placements.
sanguinalis (L.) Scop.] and
spotted spurge (Euphorbia
maculata L.) were surface sown
to containers fertilized using
one of the methods described
previously (incorporated,
topdressed, subdressed, dibbled
or no fertilizer). The experiment
was completely randomized
with four single-pot replications
per treatment, and each weed
species was grouped and analyzed
separately. The study was repeated
following the same methodology
and timeline on Aug. 22, 2018.
Weed counts in each pot were
recorded at three and eight weeks
after seeding (WAS). Studies were
terminated at nine WAS. Weed
counts were recorded for each
pot by first counting the total
number of emerged plants (mature
and cotyledon stage) and then
separately counting plants in the
cotyledon to 2-leaf stage of growth
(two or fewer fully formed leaves).
At nine WAS, shoot and root
20_2386_Greenhouse Product News_JAN Mod: November 16, 2020 11:53 AM
Print: 12/09/20 9:37:18 AM page 1 v7
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GREENHOUSE PRODUCT NEWS 31

http://www.a-vinternational.com

January 2021

Table of Contents for the Digital Edition of January 2021