Sulfur (S) Fertility Management
the past 15 to 20 years, considerable research with sulfur fertilization
has been conducted in Kansas. Positive yield responses have been noted
on wheat - particularly where grown on low organic matter, sandy soils.
Sulfur requirements depend on the difference between soil additions of
this nutrient from precipitation, irrigation water, soil organic matter
the amount of sulfur required by the wheat crop. The following equation
may be used to help develop KSU sulfur fertilization guidelines for
Rec = (YG x 0.6) – (2.5 x % SOM ) – Irrigation Water S – Manure S
– Soil Test S
is yield goal (bushel per acre)
is crop factor (0.6 pounds of S per bushel)
SOM is percent soil organic
matter (2.5 pounds of S per % Soil Organic Matter)
Sulfur deficient fields exhibit a general yellowing and stunting of wheat
plants. Sulfur deficiency may easily be confused with nitrogen deficiency.
On wheat, older leaves tend to exhibit more yellowing than upper leaves
for nitrogen deficiency. Sulfur deficiency generally results in the lower
leaves remaining a more pale green. It is difficult to distinguish
nitrogen deficiency from sulfur deficiency on wheat.
For a more detailed look at sulfur see "Sulfur in Kansas: Plant, Soil and Fertilizer Considerations," MF-2264.