42 FARM MANAGEMENT 



of ammonia. The former acts very quickly, 

 being readily soluble in water, and so this 

 manure is only applied to crops as a top 

 dressing when they are coming up, and its 

 effects are quickly seen in increased herbage. 

 Sulphate of ammonia acts more slowly, and is 

 sown with the seed ; it is preferable to nitrate 

 of soda on wet land or for use in wet weather. 



(2) Phosphatic manures, supplying phos- 

 phates only, are superphosphate, basic slag, 

 and bones. Superphosphate is the most 

 quickly available, and so suited where prompt 

 results are required. Slag is more slowly 

 available, and most of the bone manures take 

 some time to become available. 



(3) Potash manures, which supply potash 

 only, are kainit, sulphate of potash and 

 muriate of potash. 



(4) Manures supplying lime only are lime- 

 stone, chalk, ground lime, quicklime and 

 slaked lime. 



(5) General manures, which supply all the 

 necessary compounds, are farmyard manure, 

 guano (this contains principally phosphates, 

 with small amounts of the other ingredients), 

 fish manure, soot, dried blood, etc. 



