58 



The Bulletin. 



sandy or open, porous soil, because of its easy solubility in water, 

 and of its givin^s; out before a long-seasoned crop has made its 

 growth, thus leaving the crop without a supply of nitrogen before 

 the end of the growing season. Its use is most strongly advocated 

 for short-season crops, as in early truck and vegetable growing and 

 as a top dressing for grain and for corn and cotton after growth is 

 well advanced, or for any crop when seen to be in need of a quickly- 

 acting nitrogen-supplying material. 



Dried blood, whicli is a fair representative of the animal and 

 vegetable nuiterials furnishing nitrogen, as cotton-seed meal, tank- 

 age, etc., is not soluble in water and acts more slowly and for a 

 longer time. It must be changed by rotting or decomposing in the 

 soil into nitrate before it can feed the crop, and is thus likely to be 

 effective throughout a reasonable growing season. 



It has become a practice in growing many crops to apply only a 

 part of the nitrogen at the time of planting and a portion later, 

 usually as nitrate of soda, so as to keep the crop growing as rapidly 

 as possible. 



The experiments in Table VI were planned with a view of 

 throwing as much light as possible on these questions of nitrogen 

 fertilization in corn growing. In the tests all of the phosphoric acid 

 and potash were applied in the drill before planting. On two plats 

 (11^ and 5") one-half the nitrogen was supplied as dried blood and 

 was ap])lied with the phosphoric acid and potash before planting, the 

 other half of the nitrogen being supi)lied as nitrate of soda and was 

 applied about July first. On two other plats (12^ and C") all of 

 the nitrogen was supplied by nitrate of soda, one-half being applied 

 before planting with the phosphoric acid and potash, and the other 



TABLE VII— RESULTS OF FERTILIZER EXPERIMENTS WITH CORN ON 



OF A PPL 

 PEsri-TS ijn field b 



(5^142) 



10» 



Unfertillzed= 0= 



69.2 pounds 13% blood= --N= 



15 pounds 14% acid pho3phate= P= 



22.5 pounds 20% manure 8alt= - K= 



Fertilizer app led In drill before planting. 



