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Thursday, January 8, 2009: 2:30 PM
Salon G (Marriott Rivercenter Hotel)
A soil fertility experiment on Alabama Blackland prairie soils has been
conducted since 2002 in an attempt to calibrate these soils for soil
test interpretation and recommendations for N, P and K. Weather-related
production problems have plagued this experiment since the beginning as
it has for producers on these soils. In 2008, a high yield potential
was reduced by late-season foliar diseases which were directly related
to K fertilization rates, the first dramatic yield response to K since
the experiment began. Surprisingly, cotton on these soils which test
"low" in P, do not respond to P fertilization. Current P and K
calibration for cotton on these soils may need adjusting based on this
experiment.
conducted since 2002 in an attempt to calibrate these soils for soil
test interpretation and recommendations for N, P and K. Weather-related
production problems have plagued this experiment since the beginning as
it has for producers on these soils. In 2008, a high yield potential
was reduced by late-season foliar diseases which were directly related
to K fertilization rates, the first dramatic yield response to K since
the experiment began. Surprisingly, cotton on these soils which test
"low" in P, do not respond to P fertilization. Current P and K
calibration for cotton on these soils may need adjusting based on this
experiment.