so 



AGRICULTURE. 



Insufficient available nitrogen. Sufficient available nitrogen. 



FIG. 27. SHOWING EFFECT OF NITRATE. 



It promotes vegetative growth rather than fruit- 

 fulness. The presence of sufiicient nitrogen 

 available'"* to the plant — unless counteracted by 

 some phosphate — is manifested by the vigor 

 and deep green color of the leaf, with possibly 

 retarded flowers and fruit, while the lack of 

 available nitrogen is shown by scanty and pale 

 foliage. The quantity available greatly affects 



* A vat iad/e plant-food io in such form that the plants can and 

 will iise it. 



