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Evansville, WI | In silt loam soils with pH of 6 to 6.3 and OM of 3 to 3.5%, what soil test level of Copper in ppm do you like to see? This is in a corn/sobyean rotation with very high yields, 230+ corn and 75 soybeans. Current test shows 1 ppm Copper and 140 ppm Iron. I am wondering if these are in the ballpark or if this is something we need to spend some time working on trials etc. Wisconsin hasn't established soil test levels for copper or iron. The entire soil test levels are shown below (I think the soil test K levels are coming back about 25% low due to drought):
pH: 6.2
OM: 3.0%
P(bray 1): 52 ppm
K: 105 ppm
Ca: 1931 ppm
Mg: 435 ppm
B: 0.5 ppm
Mn: 22 ppm
S: 4 ppm
Zn: 5 ppm
Fe: 141 ppm
Cu: 1.0 ppm
CEC: 14
Currently apply 160#N, 20#P, 150#K, 24#S, 0.25#Zn to corn in a no-till or strip till corn and notill soy rotation. Thanks in advance!
Edited by nviney 11/7/2012 17:47
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soil test Copper and Iron levels
