134 



FIELD CROP PRODUCTION 



moisture. Experiment station tests of tliis practice seem 

 to indicate that harrowing wheat is profitable if the season 

 is a dry one, this practice sometimes increasing the yield 

 as much as 6 or 7 bushels per acre. In these experiments, 

 harrowing was not found to decrease the yield during any 

 season. Rolling the wheat in the spring has also given 

 good results, in some cases better than harrowing. 



HARVESTING AND STORING 



123. Harvesting. — In some part of the world, wheat is 

 being harvested during each month in the year. In the 



Fig. 4.3. — ^Harvesting wheat with a grain binder. 



southern part of the United States wheat harvest begins in 

 May, and as the season advances progresses northward, 

 the more northerly fields being cut in August. Almost all 

 of the wheat crop in this country is harvested as soon as 

 it is ripe. However, in certain sections of the wheat 

 growing districts along the Pacific Coast it is allowed to 



