The cation exchange number of an established lawn will not change significantly with time. In addition, it cannot be adjusted by adding fertilizer or chemicals. There is no reliable soil test for nitrogen. Therefore, other factors should be considered in planning a nitrogen program. The nitrogen program is the key to a successful turfgrass fertility program.
Soil test results lb.
To increase the amount of phosphorus applied whilemaintaining the same amount of nitrogen applied, use a fertilizer high in phosphorus for the late fall application. Soil test results lb. Only apply the muriate of potash for one year. Issued in furtherance of the acts of May 8 and June 30, 1914.