22 



UxiviiRsiTY OF Xew IIami'Shike [Stu. Bull. 324 



The organic carbon losses were great when the fertilizer was applied 

 in bands in the row. No particular reason was evident from the yield 

 data to account for this large loss. 



The fertilizer applications plus lime and double lime show additions to 

 the organic matter level. 



In order of increasing phosphorus applications, the data show a de- 

 creasing loss of carbon. Organic carbon losses increased when applica- 

 tions of potassium were increased although the results obtained were not 

 statistically significant. .Applications of 4-8-7 fertilizer resulted in higher 

 losses than either the 0-8-7 or the 8-8-7. 



Accelerated soil erosion had become noticeable in ihe area. This 

 erosion was in the form of sheet removal with the formation of very small 

 rills on some sections of the field. 



Results on the Jackson farm gave approximately the same losses for 

 the 4-8-7 check, 4-8-7 (3000 pounds per acre), and the 4-8-10=4-8-14 

 combination. Organic carbon losses were materially decreased with the 

 high phosphorus application. It should be noted that the organic carbon 

 levels in the plots having this treatment were lowest at the beginning of 

 the experiment in 1927. The organic carbon level in 1939 in these ])lots 

 was not as low as was foinid in some other treatments. Benefits which 

 amounted to reductions from 22 to 42 i)cr cent in organic carbon loss were 

 obtained from the use of lime. 



80 



65 



60 



\927-- 



-- (939 



r2-YEAR PCURIOD 



Figure 1. Organic carbon in pounds per acre at l)cj?inning and end 

 of 12-ycar period, Jackson farm. 



Figure 1 shows the tendency of the organic c.nrbon level to approach 

 a value caused by the ellect of climate and the given crop])ing system. 



