58 



COBN CROPS 



In all of the above cases, 

 enormous quantities of com- 

 mercial fertilizers and manures 

 were used, but the instances 

 illustrate the ability of corn 

 to jaeld under the most fa- 

 vorable soil conditions. 



The possible yield of corn if 

 all conditions, both climatic 

 and soil, were ideal for a sea- 

 son, is probably in advance of 

 any yield thus far recorded. 

 The average yield of corn in 

 the United States is 26 bushels 

 per acre, only a small pro- 

 portion of the possible pro- 

 duction. 



CLIMATIC FACTORS AND 

 GROWTH 



46. The principal elements 

 of climate are sunshine, heat, 

 rainfall, humidity, and wind. 



The climate favorable to 

 corn is determined not so 

 much by the amount as by the 

 distribution of these factors, 

 without fluctuations so great 

 as to retard the growth or to 



Fig. 22. — A single corn plant bear- 

 ing 5 ears. Demonstrating the 

 productivity of corn in favorable 

 environment. 



