[.LUSTRATIONS. 



Page. 

 Fig. 1. Typical appearance of the soil on a cultivated plat of corn 9 



2. Typical appearance of the soil on an uncultivated plat of corn 10 



3. Shocked corn from an experimental plat at the Arlington Experimental 



Farm, 1908 13 



4. Ears of corn from the plat shown in figure 3 13 



5. Cultivated and uncultivated plats of corn, the experiment of Mr. J. J. 



Lee, Cynthiana, Ky 14 



6. Cultivated and uncultivated fodder and ears of corn, the experiment of 



Mr. Geoffrey Morgan, "Whites Station, Ky., in 1910 14 



7. One of three pairs of corn plats at the Arlington Experimental Farm in 



1911 15 



8. Map showing the distribution of the corn-cultivation experiments in the 



various States 25 



9. Two plats at the Arlington Experimental Farm, cultivated and unculti- 



vated, showing the difference in weed growth under the two methods 



of treatment 29 



10. Diagram showing the yields of uncultivated plats of corn expressed in 

 percentages of yields of cultivated plats for 124 experiments in 28 



States 31 



257 



6 





