Part I.— THE FERTILIZERS 



Section I.— NITROGEN GROUP OF 

 FERTILIZERS 



Tpie nitrogen fertilizers have certain properties in common. 

 Most fertilizers in this group contain the element nitrogen 

 in a fairly available form and do not contain any large amount 

 of either phosphorus or potassium. They all tend to stimulate 

 the active growth of the plant especially as regards the green 

 parts thereof. A general tendency of this group is to delay 

 ripening, a result not always beneficial. If applied too freely 

 they may cause corn to " lodge/' that is to grow too big 

 and heavy for the stem to properly support the ears. In the 

 case of plants bearing fruit the result of too liberal dressings 

 of nitrogenous fertilizers may result in too large development 

 of leaf or woody stem with a resultant loss of fruit. Used 

 with discretion this group of fertilizers provides one of the 

 most valuable means of obtaining large increases in the 

 crops produced. 



That there is a considerable degree of interchangeability 

 between the members of this group may be seen in Table i. 



Table i. — Nitrogen Stimulants. 

 Results of field experiments on grain. Crop per acre. 



