ROTATION OF CROPS 



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When commercial fertilizers are used, they should be 

 applied to the crops which need the most help in 

 obtaining food. With the growing of clover and the 

 use of farm manures, the minimum amount of com- 



FlG. 46. A Wheat Field. This crop was grown on land where farm manure 

 was used and a rotation of crops practiced. Ayer, Photographer. 



mercial fertilizer is required for general crop production. 

 It is more economical to reenforce the farm manures 

 with fertilizers especially adapted to the soil and crop 

 than to purchase complete fertilizers for all crops. 



338. Salable Crops. In all farming, something must 

 be sold from the farm. It should be the aim to sell 



