EXPERIMENTS OF THE BUREAU OF PLANT INDUSTRY 



15 



Figure 7 represents one of the three pairs of uncultivated and culti- 

 vated plats at Arlington in 1911, photographed just before tasseling. 

 A number of experiments were carefully conducted up to a certain 

 point and were then discontinued for various reasons, such as stock 



Fig. 7.— One of three pairs of corn plats at the Arlington Experimental Farm in 1911. The unculti- 

 vated corn is at the left and the cultivated at the right. 



breaking in, storms blowing down the corn, or the plats being har- 

 vested together by mistake. Of 15 such discontinued experiments 

 8 showed practically no difference between the cultivated and uncul- 

 tivated plats at the time of the discontinuance; 4 were in favor of 

 the uncultivated and 3 in favor of the cultivated treatment. 

 Table III gives the data for the seven years 1905 to 1911. 



257 



