Each lawn is an individual problem, so that slight modifications of the following methods may have to be made. The old. lawn may be full of long tap rooted weeds which have crowded out the grass. In such instances, it may be best to spade the lawn, remove all of the weeds and add composted ('decomposed) stable manure or some other fertilizer . Twenty-five pounds of bone meal or superphosphate plus three pounds Ammonium sulphate per 1,000 square feet of lawn area will pay rich dividends in the form of a thick green turf.
Agricultural Experiment Station, South Dakota State College
McCrory, S.A., "Essentials of Lawn Care" (1948). Agricultural Experiment Station Horticulture Pamphlets (1943-1950). 10.