PREPARING THE LAND FOR WHEAT 



147 



available phosphoric acid, and 2 per cent potash. In many 

 localities, where a supply of vegetable matter and nitrogen 

 is maintained by growing clover and by applying stable 

 manure, the application of either raw or treated rock phos- 

 phate is sufficient to provide for satisfactory yields. 



GROWING THE CROP 



185. Preparation of the Land. . The preparation of the 

 land does not differ materially for winter or spring wheat, 



Fig. 47. The disk harrow is one of the most effective tools to use in 

 preparing a good seed bed. Double disking, as shown here, leaves a level 

 surface. 



though the crops are seeded at different seasons of the year. 

 The main object in the preparation of the soil for wheat is to 

 produce a mellow, firm seed bed with sufficient loose soil on 

 the surface to check the rapid evaporation of moisture, and to 

 provide a hospitable place for the plants to grow. Where 

 possible, land is plowed for wheat, though sometimes the crop 



