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 



