Person: Tim Sieren

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Various green manure cover crop mixes can successfully be established following the harvest of a small grain crop in mid-summer. Following cereal rye seed harvest in July 2015, farmer-cooperator Tim Sieren seeded a brassica mix into one field and a legume mix into another field. He then compared 2016 corn yields resulting from a Low […]

November 21, 2016 

BLOG POST

Various green manure cover crop
mixes can successfully be established
following the harvest of a small grain
crop in mid-summer.
• Following cereal rye seed harvest
in July 2015, farmer-cooperator Tim
Sieren seeded a brassica mix into one
field and a legume mix into another
field. He then compared 2016 corn
yields resulting from a Low and High N
fertilizer rate that followed the green
manure mixes in the separate fields.
Key Findings
• Regardless of the green manure mix it
followed, corn yields were significantly
greater with the 145 lb N/ac (High) rate
compared to the 95 lb N/ac (Low) rate.
• Wet summer months likely contributed
to the superiority of the High N rate
in terms of both yield and financial
returns in 2016.

November 18, 2016 

RESEARCH REPORT

• Two farmers tested Spray strips and
No-Spray control strips of cereal rye for
fungicide residue.
• This project was a secondary project
within “Fungicide and Plant Growth
Regulator Effect on Cereal Rye
Production” (Gailans et al., 2016).
Key Findings
• At Sieren’s farm, no propiconazole
residue was found above the
detectable limit of 0.05 ppm in No-
Spray control strips.
• At Sloan’s farm, metconazole residues
of 0.02 ppm were found in both control
strip samples, compared to the 1.30
ppm baseline residue level in the
sprayed sample.

October 20, 2016 

RESEARCH REPORT

In recent years, a growing number of farmers have become interested in raising their own cereal rye seed to use as cover crop seed. However, fungal diseases and lodging can present challenges to raising small grain crops, like cereal rye, in Iowa. Warm and humid conditions during heading and grain fill periods are conducive to fungal […]

October 10, 2016 

BLOG POST

In a Nutshell
• Fungal diseases and lodging can
present challenges to raising small
grain crops, like cereal rye, in Iowa.
• Farmer-cooperators investigated the
use of fungicides and plant growth
regulators on cereal rye seed crops
to determine effects on yield and
germination rate.
Key Findings
• Across four fields at three farms, in only
one instance, when a fungicide was
paired with a growth regulator, were
cereal rye seed yields and financial
returns improved.
• Germination percentage of harvested
seed was generally greater than 90%
regardless of treatment.

September 30, 2016 

RESEARCH REPORT

Cultivation of cereal rye for cover crop seed offers the possibility of frost-seeding a legume into the standing rye crop in early spring, where the legume can produce biomass and fix N following rye harvest. In 2014, farmer-cooperators Tim Sieren and Dick Sloan grew corn in rotation following cereal rye frost-seeded with red clover and […]

December 16, 2015 

BLOG POST

In a Nutshell
• Cultivation of cereal rye for cover crop
seed offers the possibility of frost-seeding
a legume into the standing rye crop
in early spring, where the legume can
produce biomass and fix N following
rye harvest.
• Farmer-cooperators Tim Sieren and
Dick Sloan grew corn in rotation following
cereal rye frost-seeded with
red clover and compared this to corn
grown using synthetic N fertilizer applications.
• Tim and Dick invited Iowa State University
graduate student Will Osterholz
on to their farms to quantify N uptake
by corn as well as two measures of N
release from soil organic matter: net N
mineralization and gross ammonification.
Key findings
• Red clover did not improve corn
growth, N content or grain yield compared
to synthetic N fertilizer.
• Soil N mineralization rates in August
tended to be higher with red clover
compared to synthetic N fertilizer, but
differences were not statistically different.
• Fertilization with supplemental N at
planting could provide corn with early
season N before clover decomposition
can provide sufficient N to the corn
crop in late summer.

November 30, 2015 

RESEARCH REPORT

Objective: Quantify the persistence and biomass production of a cereal rye cover crop that is seeded into standing corn at the same time as side-dressing nitrogen fertilizer (early June).

July 6, 2015 

RESEARCH PROTOCOL

Learn management tactics critical to success with cereal rye. Greg Roth of Penn State University will discuss his experiences and research with rye, including new hybrid rye originally developed in Europe that is yielding well in U.S. trials. Iowa farmer Tim Sieren will share some of his experiences – both good and bad – growing cereal rye for seed. He will also discuss some of the equipment he uses for seeding, harvesting, storage and seed cleaning.

February 18, 2015 

FARMINAR

Applying manure or fertilizer with a
nitrogen stabilizer has been identified
as a practice farmers can use to reduce
the potential for nonpoint source pollution
of surface waters.
• Farmer-cooperator Tim Sieren assessed
the effect on corn yields of liquid swine
manure and anhydrous ammonia
applied with commercially available
nitrogen stabilizers.
KEY FINDINGS
• Corn yields were the same with and
without a nitrogen stabilizer.
• The amount spent on N per bushel of
corn produced was significantly greater
when a nitrogen stabilizer was used

December 7, 2014 

RESEARCH REPORT