Missouri Corn Growers' Association. 



357 



The results obtained from wheat grown in rotation, com- 

 pared with that grown continuously, are shown in the following 

 table: 



WHEAT GROWN IN ROTATION VS. WHEAT GROWN CONTINUOUSLY 



YIELD OF WHEAT PER ACRE. 



Time and depth of plowing. 



July 15th, 7 inches deep 



July 15th, 3 inches deep 



August 15th, 7 inches deep . . . 

 September 15th, 3 inches deep 



Wheat in 

 rotation, 

 bushels. 



44.66 

 44.08 

 41.16 

 25.50 



Wheat con- 

 tinuously, 

 bushels. 



34.95 

 21.57 

 32.83 

 16.39 



Difference, 

 bushels. 



9.71 



22.51 



8.33 



9.11 



Wheat grown in rotation produced 22.51 bushels per acre 

 more on shallow July-plowed ground, 9.71 bushels per acre more 

 on deep July-plowed ground, 8.33 bushels per acre more on 

 August-plowed ground and 9.11 bushels per acre more on 

 September-plowed ground than when continuously cropped. 



It will be seen from these tests that the largest yields of 

 wheat and the largest profits result from those methods of 

 preparation by which the soil is worked early in the season and 

 kept cultivated until the wheat is sown and when the wheat is 

 grown in rotation with other crops. This corroborates our 

 observations and the results of past trials. There may be an 

 exception to very early plowing on fertile soils in wet seasons. 

 Upon soils rich in plant food and well supplied with moisture 

 very early cultivation and continuous working of the seed bed 

 may liberate plant food in such large amounts that the wheat 

 lodges, resulting in a decreased yield. Under these conditions 

 dimeum early plowing is advisable. In dry seasons and on soil 

 of average fertility the best yields will be produced by starting 

 the preparation of the seed bed as early in the season as possible. 



