Person: Tim Landgraf
Growing tomatoes in the high tunnel gives farmers an early jump on the tomato market, and can help protect the plants from some environmental stressors. Two farmers (Tim Landgraf at One Step at a Time Gardens and Mark Quee at Scattergood Friends School) conducted replicated variety trials in high tunnels of two determinate tomato varieties, Mountain […]
December 2, 2016
Two farms conducted replicated
variety trials in high tunnels of two determinate
tomato varieties, Mountain
Fresh Plus and Rebelski.
• Yield at both farms was lower than
yields reported in other published high
tunnel variety trials.
• Rebelski yield was higher at Landgraf’s,
with 1.4 lb/plant difference.
• Rebelski yield was also higher at
Quee’s, with 2.1 lb/plant difference.
November 22, 2016
Since joining Practical Farmers of Iowa in 1999, Jan Libbey and Tim Landgraf have participated in 15 on-farm research trials. The importance of on-farm research for farm profitability was the center feature of their field day on August 14 in Kanahwa. Said Jan, “Partnerships we’ve found through PFI have a lot to do with the success we’ve […]
September 15, 2016
August 3, 2016
In a Nutshell
• Five farmers compared two bell pepper
varieties, Olympus and Revolution,
to determine which produces better in
• Each farm planted four randomized
pairs of research plots, each pair with
10-20 plants of each variety.
• Pepper yield was significantly different
by farm, but treatment (variety) also
had a significant effect on yield. Revolution
yield was significantly higher
than Olympus when all farms were
• Revolution produced more pounds
and number of peppers per ft2 and
per plant than Olympus at three of
five farms. The remaining two farms
saw no difference in yield between the
• Average plant yield of green bell peppers
across all farms was 4.3 lb/plant
for Revolution and 4.03 lb/plant for
• Plant spacing was different by farm,
but end-of-season yield for green bell
peppers ranged from 1.82 – 2.66 lb/ft2.
December 7, 2015
Objectives: 1. Determine which pepper variety, Olympus or Revolution, produces more marketable fruits and total yield in side-by-side field trials in Iowa.
July 5, 2015
June 11, 2013
January 29, 2013
January 3, 2013