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(25x45 ft.) which included both sprayed and unsprayed areas. The 

 following diagram shows the arrangement and treatment of the dif- 

 ferent sections. 



Section: A 



B 



DIAGRAM 1. ARRANGEMENT AND TREATMENT OF SECTIONS IN EXPERIMENT ON 

 AFTER-TREATMENT OF LAWN SPRAYED WITH IRON SULFATE FOR DANDELIONS. 



Section A was treated twice during the season (March 29 and 

 October 16) with fine-ground bonemeal at the rate of 1000 pounds 

 per acre. 



Section D was given an application of stable manure in December, 

 1912. This was allowed to remain on the ground over winter and 

 the coarse material raked off late in March, 1913. 



On Sections B and C no fertilizer of any kind was used. Sections 

 A, B and D were given a generous reseeding with a seed mixture 

 containing 11.5 pounds of Kentucky blue grass and 8.5 pounds of 

 red top. This amount (20 pounds) allowed 25.8 ounces of seed 

 per square rod of lawn. On April 4, and just before sowing the seed, 

 the four sections were raked over thoroly with an iron rake. After 

 the seed was sown Sections A and B were sprinkled with a light 

 covering of compost soil. The entire area (all four sections) was 

 then rolled with a heavy lawn roller to counteract the " frost lift," 

 and firm the soil about the roots of the grass. 



With reference to the results obtained from the after-treatment 

 measures, it was recorded on May 13, 1913, that the application 

 of manure on Section D had retarded, by about two weeks, the 



