COTTON CULTURE 39 



from the same amount applied broadcast over the same 

 surface and plowed in, etc. The fertilizer should be ap- 

 plied deep enough to avoid the drying-out effect of a severe 

 drouth, and no definite rules can be laid down as to the 

 exact depth to which fertilizers should be applied since 

 this will depend upon the depth of the soil and local con- 

 ditions as to drainage, etc. 



NATURE OF FARM-MADE MANURES 



Stable and farmyard manure consists of the solid and 

 liquid excrements of animals fed on the farm, the excre- 

 ments being usually mixed with straw and waste products 

 of the farm. 



Horse manure is difficult to mix thoroughly with litter 

 on account of its dryness. It is called a "hot" manure. 

 On account of its loose texture it easily undergoes decom- 

 position or fermentation, producing a high degree of heat. 

 Horse manure is very liable to lose more or less of its 

 nitrogen by the escape of ammonia. 



Sheep manure is quite dry, and is commonly the richest 

 of farm-produced manures. Like horse manure, it under- 

 goes fermentation easily, and is classed as a "hot" manure. 

 It is also very liable to lose ammonia. 



Pig manure varies greatly in composition, but is gen- 

 erally rich as compared with other farm-produced ferti- 

 lizer materials, yet contains considerable water. In 

 decomposing, it produces but little heat, and is therefore 

 called a "cold" manure. 



Cow manure contains, as a rule, less fertilizing mate- 



