14 



N. H. EXPFRIMEXT STATIOX 



[Bulletin 320 



Table 14. — Five year average yield, Livingston pasture 



Included in Table 14 are average responses from four complete 

 fertilizers and five nitrog-en carriers for comparison. Plot 10, which 

 received 50 pounds of nitrogen in a 12-4-4 fertilizer increased yields 

 but little over the average nitrogen carrier. Although this fertilizer 

 contains a limited amoimt of phosphoric acid and potash, the amount 

 of these two elements contained therein is not sufficient to induce 

 anything like maximum clover growth such as is obtained under the 

 0-20-20 treatment in Plot 12 or even with the complete fertilizers. 



There is but one comparison available on Livingston field for a 

 fertilizer without nitrogen. This is Plot 12, where a 500 pound appli- 

 cation of 0-20-20 was annually applied. The yield of this plot for 

 the period studied is about midway betw^een the average of the ni- 

 trogen and complete fertilizers. This is, of course, in direct contrast 

 to Seavey where the phosphoric acid-potash treatment is consider- 

 ably below both the other treatments. 



()ne interesting thing about the 0-20-20 treatment lies in the fact 

 that the forage there has a higher prtitein content than that of any 

 other treatment. This reflects the higher percentage of clover which 

 appears under this treatment, a larger percentage even than witli a 

 complete fertilizer system. 



On Plot 15. Ammo'Phos .\. 11-48-0. has been used while on Plot 17. 

 nitrate of potash 13-0-44 has been amuially a]:)plied. These two fer- 

 tilizers have been applied at rates so that 50 pounds of elemental ni 

 trogen would be furnished. While the actual yields for the two 

 plots are not vastly different (Table 14) wild white clover has ap- 

 peared in abundance on the ])l()t treated with nitrate of potash, \vhere- 

 as there has been very little clover to date on the Ammo Phos plot. 

 Moreover, the nitrate of potash plot has been very closely grazed 

 while the forage ])roduccd with the .XmnKi Phos treatment has been 

 distinctly less palatal)le and less closely fed. 



Ammo Phos has a distinct tendency to make the soil more sour 

 which may militate to some extent against the clover. P.ut above 

 this the grass on this plot has assumefl a reddish hue similar to that 

 on which sulphate of ammonia was ai)pHed. I'nder grazing tests 

 the -Ammo Phos plot would certainly show a distinct disadvantage 



