N. H. EXPERIMENT STATION 



[Bulletin 320 



three years, one ton of lime was top-dressed once in five years and 

 nitrogen in the form of nitrate of soda was applied at 312 pounds 

 annuallv. 



Table 2. — Average yields on 5 clover pastures, 1930 



Table one gives the average yield of the ten pastures for the sea- 

 son of 1930. The data indicate that all treatments increased yields. 

 the yield of the complete fertilizer and lime plots running about 

 three times that of the untreated checks. Gains for the various 

 substances used alone or in combination show about equal response 

 in the gains of both dry matter and protein in respect to superphos- 

 phate, lime and potash but considerably more stimulation for the ni- 

 trogen application. 



T.'iBLE 3. — Average yields on 5 grass pastures, 1930 



A critical study of the vegetation in these pastures showed that 

 some of them had a great deal of wild white clover during 1930 while 

 others had very little or none apparent in the stand. Since the re- 

 sponses in the pastures differed widel}' dei)ending upon the presence 

 or absence of clover the pastures were divided and summarized on 

 this basis. 



The average yields of the five pastures in which clover was an in- 

 tegral part of the stand are given in Table 2. Increase in dry matter 

 recorded for the various substances varies from 409 pounds per acre 

 for lime to 546 jxtunds for nitrogen while increase for protein varies 

 from 58 pounds for nitrogen to 117 pounds for potash. Potash ])re- 

 sents a somewhat higher increase of protein, i)robal)ly because it 

 seems to exert a strong inllucnce on clover. It should be noted in 

 all these oiiservati(^ns. however, that with the excejition of sujier- 

 ])hosphate (I') none of the substances were used alone but with the 

 other materials as indicated. Oftentimes the combined effect of two 



