18 



The Bulletin. 



The following materials were used as carriers of the different ele- 

 ments of plant food : 



Dried blood for nitron-en. 



Acid phosphate for phosphoric acid. 



Potassium sulphate for jDotash. 



Rock lime for lime. 



The rate of application is based on the amount of the various plant 

 foods known to be removed by maximum crops. In the case of corn 

 100 bushels was taken as a maximum yield. This may seem high 

 to some but many such yields are yearly obtained in the State and 

 over twice this amount has been produced on a measured acre. Even 

 on this very much depleted field, we obtained a yield of nearly GO 

 bushels by the use of commercial fertilizers alone. In order to secure 

 the required amount of plant food it was necessary to apply the fol- 

 lowing amounts of materials: 



Dried Blood— 1,0C2 lbs. 



Acid Phosphate — 350 lbs. 



Sulphate of potash — 170 lbs. 



Lime was applied at the rate of 1,000 pounds of rock lime per 

 acre. 



The following table gives the treatment and the yield of each of 

 the plats : 



TABLE 1. RESULTS ON PORTER'S CLAY. CHAS. BALDWIN'S FARM, BLANTYRE, 



TRANSYLVANIA CO.. N. C. 



Plat 



No. 



TREATMENT. 



Yield per Acre. 



Grain. I Stover. 

 Bushels. Pounds. 



Increaae. 



Grain. Stover. 

 Bushels. Pounds. 



1 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 11 

 12 



None 



Lime (CaO) 



Nitrogen 



Phosphoric Acid- 

 Potash - 



None 



Nitrogen, Phosphoric Acid- 

 Nitrogen, Potash 



23.1 

 28.4 

 26.7 

 39.0 

 19.7 

 23.9 

 55.0 

 28.7 



Phosphoric Acid, Potash 40. 1 



Nitrogen, Phosphoric Acid, Potash- 52.7 



None - 24.4 



Lime, Nitrogen, Phosphoric Acid, Potash 59.8 



1590 

 2030 

 2020 

 2200 

 1180 

 1340 

 3360 

 2810 

 2130 

 3240 

 1370 

 3850 



5. 3 440 



3. 6 j 430 



15. 1 860 



—4.2 —160 



31.1 



4.9 



15.7 



28.3 



2020 

 1470 



780 

 1870 



35.4 



2480 



Average gain for Nitrogen 



Average gain for Phosphoric Acid- 

 Average gain for Potash 



Average gain for Lime (CaO) 



