The Bulletin 



43 



Continued. 



'Old Field" and in Fields A and B. 



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 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, which is a fair representative of the animal and vege- 

 table materials furnishing nitrogen, such as tankage, cotton-seed meal, 

 etc., is not soluble in water like nitrate and hence acts more slowly and 

 for a longer time. It must be changed by rotting 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 time of planting and a portion later, usually as nitrate 

 of soda, so as to keep the crop growing as rapidly as possible. 



