Person: Tim Sieren

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PFI research shows corn after a cover crop can be successful with proper managementFor Release: April 4, 2018 Dick Sloan, of Rowley Tim Sieren, of Keota Strip at Dick Sloan’s farm where the cover crop was killed three days before planting corn. Contact: Tamsyn Jones | Outreach and Publications Coordinator | Practical Farmers | (515) [...]

April 4, 2018 

NEWS RELEASE

Last fall was wonky. Harvest was late and many people didn’t make it into the fields until November to establish their winter small grains – a month or more after optimal planting dates for yield. On top of it we’ve had some bitterly cold stretches this winter with little snow cover, so some folks are […]

March 10, 2018 

BLOG POST

Small grains are a unique crop in the Midwestern system because they are harvested early – around July – leaving the field open for different field operations and cover crops. This longer window makes it possible to grow a legume cover crop that can synthesize nitrogen and offset purchased fertilizer costs for the following crop […]

February 19, 2018 

BLOG POST

A roller-crimper presents farmers the
opportunity to mechanically terminate
cover crops without chemicals or
tillage. This method is dependent on
a large amount of cover crop growth
and the cover crop reaching the
flowering stage before crimping.
• Farmer-cooperator Tim Sieren
compared soybean seeding dates
relative to cover crop termination
(before and after) as well as cover
crop termination techniques (chemical
vs. roll-crimp).
Key Findings
• Cover crop termination date had
the strongest effect on soybeans.
Soybeans yielded best when the cover
crop was chemically terminated on
May 5 and the soybeans were seeded
on Apr. 24 or May 7.
• Roll-crimp termination of the cover
crop was a challenge and this was
attributed to a thinned cover crop
stand resulting from drilling soybeans
on May 7 before roll-crimping on May
30.

November 30, 2017 

RESEARCH REPORT

Successfully raising corn after a
cover crop requires timely cover
crop termination and N fertilization.
Commonly, farmers terminate a cover
crop 2-3 weeks prior to planting corn
but generally do not need to apply any
more N than if they did not use a cover
crop.
• Farmer-cooperators Dick Sloan and
Tim Sieren compared terminating their
cover crops approx. 3 weeks prior to
planting corn with terminating their
cover crops within 3 days of planting
corn. They also investigated N fertilizer
timing and rates across the cover crop
termination dates.
Key Findings
• Delaying cover crop termination
until a few days before planting
corn increased cover crop biomass
production in the spring.
• Terminating the cover crop a few
days before planting corn generally
resulted in reduced yields at both farms
regardless of N strategy.
• Fall manure with 35 lb N/ac at corn
planting and 90 lb N/ac at side-dress
resulted in no yield drag at Sloan’s
when the cover crop was terminated 3
days before planting corn.

November 20, 2017 

RESEARCH REPORT

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