22 



The Bulletin. 



The following table gives the treatment and yields of corn in 

 1910: 



TABLE 2. RESULTS ON PORTER'S SANDY LOAM. B. VV. MARSHALL'S FARM, 

 HENDERSONVILLE. HENDERSON CO.. N. C. 



Plot 

 No. 



TREATMENT. 



Yield per Acre. 



Increase. 



1 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 



None 



Lime(CaO) 



Nitrogen... 



Phosphoric Acid... 



Potash 



Nitrogen, Phosphoric Acid.. 



Nitrogen, Potash 



None - -- 



Phosphoric Acid, Potash 



Nitrogen, Phosphoric Acid, Potash 



Lime, Nitrogen, Phosphoric Acid. I'otash. 



4.4 



41.4 



47.4 



760 

 2320 

 2400 



Average gain for Nitrogen ... 



Average gain for Phosphoric Acid. 



Average gain for Potash.. 



Average gain for Lime, (CaO) 



25.8 



11.6 



3.3 



9.6 



1210 

 410 

 270 

 400 



There is a striking difference in the results on this field compared 

 with those on the Blantyre field. Here we find no apparent benefit 

 from phosphoric acid alone but nitrogen alone gave an increase of 

 16.5 bushels. When acid phosphate was applied in addition to nitro- 

 gen we find it gave a large increase. Like the Porter's clay of the 

 Blantyre field, this soil responds to both nitrogen and phosphoric acid 

 when applied together, but instead of phosphoric acid being needed 

 first, nitrogen appears to be the controlling element in crop pro- 

 duction. This is brought out very clearly in the lower section of the 

 table. Here we find, as at Blantyre, that nitrogen and phosphoric 

 acid gave the largest increases, but that their relative importance is 

 practically reversed. Potash either alone or in addition to nitrogen 

 gave slight decreases in yield, but in the case of plats 9 and 10 where 

 applied with phosphoric acid, and with nitrogen and phosphoric 

 acid, the yields were larger than on plats 4 and C. The increase of 

 number 10 over number 6 is very marked, so much so that it brings 

 up the average gain for potash to 3. -3 bushels per acre as compared 

 to a loss of .85 bushels on the Porter's clay. 



Lime alone gave an increase of 13.14 bushels and in combination 

 with nitrogen, phosphoric acid and potash, G bushels. This large 



