24 



THE WEED FACTOR IK THE CULTIVATION OF CORN. 



RESUME OF THE CORN-CULTIVATION EXPERIMENTS. 



Table TV presents a resume of all the experiments. The yield of 

 the uncultivated plat is expressed as a percentage of the yield of the 

 cultivated plat. The average percentages shown in Tables I and III 

 are here compiled for comparison. Of the total number of 125 tests 

 whose data are recorded in this bulletin, 1 test shows fodder yields 

 only, 54 tests show yields of both fodder and grain, and 70 tests 

 show grain yields only. The data on grain yields are, therefore, 

 given for 124 and on fodder yields for 55 of the total number of 

 experiments. The general average for all the experiments shows 

 that the fodder on the uncultivated plats was 95.1 per cent of the 

 cultivated and that the uncultivated grain was 99.108 per cent of 

 the cultivated. 



Table IV. — Resume of average results of experiments in corn tillage. 



Designation of experiments. 



Earlv experiment station work (Table I). 

 1905 and 1906 (Table III) 



1907 (Table III) 



1908 (Table III) 



1909 ( Table III ) 



1910 (Table III) 



1-911 (Table III) 



Total 



General average. 



Fodder. 



Number 

 of exper- 

 iments. 



Average 

 yield of un- 

 cultivated 

 plats ex- 

 pressed as 

 percentage 

 of culti- 

 vated. 



85.35 

 96.36 

 91.6 

 94.95 

 101.15 

 96.19 

 91.24 



95.1 



Grain. 



Number 

 of exper- 

 iments. 



124 



Average 

 yield of un- 

 cultivated 

 plats ex- 

 pressed as 

 percentage 

 of culti- 

 vated. 



108.4 

 110.84 

 97.93 

 105. 27 

 96.51 

 92.37 





99.108 



GEOGRAPHICAL DISTRIBUTION OF THE EXPERIMEXTS. 



Figure 8 shows the distribution of the experiments in the various 

 States. It will be noted that the- conditions of soil and climate 

 under which the tests were made are quite varied. The total num- 

 ber of experiments recorded in the summary is 125 and the number 

 of States represented in this work 28. In Table V the location of 

 the experiments by States is correlated with the average yield of 

 grain from the uncultivated plats expressed as a percentage of the 

 average yield of grain from the cultivated plats. 



