5i 



The Bulletin. 



Table VI— 

 AVERAGE RESULTS FOR 6 



Number 



of 



Plat. 



S^'-ISS 



Fertilizer Application per Acre. 



"CO) 

 m D tj 



■a M u 

 c o< 

 2 -*^ *- 



r61.6 pounds 13% blood applied at plant- 



ing= 4-5N= 



13.5 pounds 14.8% nitrate of soda applied 

 at planting=. 1-5N= 



200 pounds 14% acid phosphate^ P= 



50 pounds 20% manure salt^ K= 





CO ^ "^ 



O O o 



0^^ p. 



28 



O 



CI 



Yield of Seed 



Cotton in 



Pounds per 



Acre. 



1903. ! 1904. 



10 



Note. — The check for plats ll^, 12^ and 13', field B, have been obtained from"plats 5> 

 and 14^ It has been assumed that there is a uniform increase or decrease in the natural fer- 



EFFECT OF DIFFERENT MATERIALS FURNISHING NITROGEN AND 



TIME OF APPLICATION. 



The experiments, the results of which are presented in Table VI, 

 were arranged to test the comparative value of dried blood and nitrate 

 of soda as nitrogen-furnishing materials in growing cotton, as well 

 as the best way of applying these. 



Xitrate of soda is a material easily soluble in water and therefore 

 quickly available for the use of plants. The questions usually raised 

 in connection with its use are the possibility of its loss from the soil, 

 especially sandy or open, porous soil, because of its easy solubility 

 in water, and its giving out before a long-seasoned crop has made its 

 growth, thus leaving it 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 ad- 

 vanced, 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, as cotton-seed meal, tankage, 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 through- 

 out 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 tests in Table VI were planned with 

 a view of throwing as much light as possible on these questions of 

 nitrogen fertilization. In the experiments all of the phosphoric acid 



