blossoming of the dandelions in the unsprayed area. However, 

 both dandelions and grass made a vigorous growth. Early in July 

 note was made of the fact that, in the sections reseeded, jl of the 

 bare spots left by dandelions killed by spraying, were well covered 

 with a growth of young grass plants. The effect of the application 

 of bonemeal on Section A was not evident until early in September 

 when the darker green color of the grass in this entire section became 

 noticeable. 



PLAT 2. 



Plat 2, on the Station grounds, was staked out early in the spring 

 of 1913. It consisted of an area 15 x 100 feet located north of the 

 Station horse barn, and it crossed, at right angles, the plat sprayed 

 by French in 1909 and 1910. The soil was a clay loam lower in 

 fertility and more responsive to the effects of drought than the soil 

 of plat 1. Like many other soils immediately surrounding dwellings, 

 this soil had been modified by building operations in the past. This 

 lawn was selected because it was believed to be typical in many 

 respects of the average dandelion-infested lawn in this State. The 

 plat selected as well as the adjoining lawn on all sides was badly 

 infested with dandelions. Scarcely a square foot of area could be 

 found which did not contain at least two or three vigorous plants. 



This plat was sprayed six times during the season with four gallons 

 of solution made by dissolving one and one-half pounds of the " sugar " 

 form of iron sulf ate in each gallon of water. This quantity of solu- 

 tion was found sufficient to cover the area thoroly. After each 

 application the sprayed plat presented the usual black, unsightly 

 appearance which disappeared after a few days. 



As midsummer approached it became increasingly evident that this 

 lawn, because of the unthrifty condition of the grass due to low fer- 

 tility of the soil, would not withstand spraying during the dry mid- 

 summer months without some special care in the form of watering 

 and fertilizing. Nitrate of soda has been recommended as a desir- 

 able application to induce the growth of grass during the summer 

 months. In order to test the value of this fertilizer in connection 

 with the response desired from spray-injured or blackened lawns, 

 nitrate of soda was applied at the rate of 100 pounds per acre to 

 the west one-half of this plat. For this area (15 x 20 feet) two pounds 

 of the nitrate of soda was dissolved in a large volume of water which 

 was then sprinkled over the lawn with a sprinkling can. Two appli- 



