5. Treatments
• 0 control
• 0.5 annual (total: 1.5 t)
• 1 t annual (total: 3 t)
• 2 t annual (total: 6 t)
• 2 t in year one, no other applications
• High rates typical for soil improvement,
not plant nutrients
• Some discussion about whether non‐
sodic soils can benefit from FGD gypsum
Buckley and Wolkowski. 2012. Crop Management doi:10.1094/CM‐2012‐0925‐01‐RS.
Norton and Dontsova. 1998. Advances in GeoEcology 31:581‐587.
(1 ton gypsum contains 372 lbs S)
13. Soil physical properties
• Double ring infiltration
– Inner ring 30 cm (12”), outer ring 75 cm (30”)
– Apply 20 cm (8”) 12 hours before measurement
period
• Ottawa fall 2013 average is 12.3 cm per hr
– The spring 2015 and fall 2015 averaged out to
about 3 cm per hr
• Goessel Spring 2014 and Spring 2015 averaged
0.7 cm per hr
– Fall 2015 averaged 2.7 cm per hr
• Goessel < Ottawa, would have guessed that
• This much variability is often observed
18. Haney Number Ottawa
Rate Fall 2013
t ac-1 yr-1 Haney No.
0 9.9
0.5 7.3
1 9.2
2 9.2
2 t once 7.8
p-value 0.55
Fall 2015
Haney No.
12.2
12.1
11.5
11.4
12.9
0.63
As of 1/26/16 there were no peer-
reviewed articles that define or
explain the relevance of the Haney
number.
21. PLFA Ottawa
Rate Fall 2013
t ac-1 yr-1 PLFA Diversity Index1
0 1.5
0.5 1.4
1 1.2
2 1.3
2 t once 1.5
p-value 0.53
Fall 2015
PLFA Diversity Index
1.5
1.4
1.4
1.5
1.3
0.45
1.6+ excellent
1.5+ to 1.6 very good
1.4+ to 1.5 good
1.3+ to 1.4 slightly above average
1.2+ to 1.3, average
1.1+ to 1.2, slightly below average
Frostegård, Å., A. Tunlid, A., and E. Bath. 2010. Use and misuse of
PLFA measurements in soils. Soil Biol. Biochem. 43:1621-1625.