54 



with brass cylinder, and equipped with a fine nozzle will be found 

 satisfactory; while for large lawns a sprayer mounted on wheels 

 is desirable. For very large areas (parks, roadsides, etc.) a power- 

 driven field or orchard sprayer will be found most practical. A 

 lead of hose at least 80 to 100 feet long should be used on the power 

 outfits. In any case, the nozzle should be capable of delivering 

 a fine mist-like spray which will drift evenly over the foliage, 

 and the area should be sprayed evenly, avoiding the drenching of 

 any particular part. One of the new type spray-guns attached 

 to a power sprayer will be found to facilitate the work very materially 

 when it is desired to cover a large area quickly and evenly. 



The spray solution should be strained thru a fine strainer or two 

 thicknesses of cheesecloth to remove any particles which would 

 clog the nozzles. 



CAUTION. 



On stone, cement, metals, and cloth, iron sulfate solution produces 

 a conspicuous yellowish-brown rusty stain which is extremely difficult 

 to remove. Accordingly, care should be taken to avoid getting 

 any of the spray on one's clothing or on sidewalks, building founda- 

 tions, monuments, curbstones and the like. Even the dragging of 

 the wet hose across stone or cement sidewalks will stain them. 

 In our experiments when working around sidewalks and buildings, 

 we have found it convenient to use a screen made of cloth tacked 

 over a light wooden frame (3 by 6 feet) . A helper is required to hold 

 the screen in position and move it from place to place as needed. 



After using, the sprayer should be washed out thoroly with 

 clean water to prevent serious rusting. The working parts of the 

 spray pump should be kept well oiled. 



AFTER-TREATMENT MEASURES. 



Our experiments and experience demonstrate that it is necessary 

 to supplement the spraying operations with at least two after- 

 treatment measures, namely, fertilization and reseeding. 



FERTILIZATION. 



The fertilization of lawns is essential in order to produce a thrifty 

 growth of grass and dense turf for a protection against the encroach- 

 ment of weeds. In our experiments, five methods of fertilization, 



