114 CONSERVATION AND IMPROVEMENT OF SOIL 



the lime just before the growth of clover, as it will benefit this 

 crop and clover will prevent loss of lime itself. If the rotation be 

 long or short the lime may still be applied once in the rotation 

 course. The form and amount of lime to use will depend some- 

 what upon the length of the rotation course. 



In determining the quantity of lime to apply to a field the 

 actual amount of calcium in the form to be used should be con- 

 sidered, remembering that other ingredients, such as water and 



SUPERPHOSPHATE 



POTASH SALTS 



SODIUM NITRATE 



FIG. 82. This diagram shows what fertilizers may be mixed before they are applied. 

 Those that cannot be mixed before applying may be spread on the field separately if desirod. 

 Ingredients joined by black bands should not be mixed. Those joined by light lines may 

 be mixed. Those joined by two lines should be applied separately. (U. S. D. A.) 



carbon dioxide, add much weight, but do not add more calcium. 



Methods of Liming. It is a very disagreeable task to spread 

 lime on a field when the wind is blowing. This is particularly true 

 of hydrated and air-slaked lime. Compare figures 80 and 81. 

 Quick lime, or calcium oxide, should always be air slaked by leav- 

 ing it in a pile long enough to accomplish the purpose. 



A little water is usually added to hasten the process, if rains 

 do not occur. Some low, box form of fertilizer spreader or special 



