HIGH GRADK NITROGENOUS FERTILIZER MATERIALS 5 1 



checking this pest the use of cotton-seed meal will be much less 

 in the future. 



A physical examination will not always indicate its fertilizing 

 value. Many of the meals have the hulls so finely ground that it 

 is impossible to detect the extent of their presence with the naked 



Fig. 5. — A field of cotton, the source of cotton-seed meal. 



eye. The color of a meal is not always an indication of it.s 

 nitrogen content. Always purchase cotton-seed meal under a 

 strict guarantee as this product is variable in composition and a 

 physical examination of it does not show its fertilizing value. 

 Linseed meal is another vegetable compound used for fertiliz- 

 ing purposes. It is a by-product in the manufacture of oil from 

 flaxseed. There are two classes of linseed meal, namely, the old 

 and new process meal. The old process meal is obtained by press- 

 ing out the oil from the cold or warmed crushed flaxseeds. In 

 the new process the oil is extracted with naphtha and the naphtha 

 driven off by steam. The old process and new process meal 



