26 N. H. Agr. Experiment Station [Bulletin 304 



Cyanamid on Corn 



Tests of cyanamid were made on corn at the rate of 300 pounds per 

 acre on the Lane Farm in Chichester. The fertilizer was plowed under 

 with manure to see whether the corn would utilize more plant food in 

 its growth, either from the cyanamid or from the more rapidly decay- 

 ing manure. 



The average increase for the three plots was 1.102 pounds of corn 

 valued at $8.75. The cost of the cyanamid was $5.85, leaving a net of 

 $2.90 for its use. 



These differences are undoubtedly significant as the probable error 

 on the cyanamid plots is only ±56. (Purnell Fund) 



Lime Applications on Potatoes 



Attempts to counteract the influence of lime on promoting scab on 

 potatoes have been made for several years on plots on the Jackson Farm 

 in Colebrook, with varying amounts of lime as well as with basic slag, 

 which is a lime-bearing substance. 



The plots which were neutralized with 900 pounds of aluminum sul- 

 phate showed a slight reduction in badly scabbed tubers, as well as a 

 reduction in pH to the same level as when two tons of lime had been 

 applied. 



The scab counts on series where four tons of lime were applied in 1929 

 indicate much less scab, especially in the "bad" grouping, where the 

 potash has for several rotations been omitted from the fertilizer. 



Slag appears to be quite effective in raising the pH level, with an in- 

 crease in scab counts. Two applications of fertilizer with slag have 

 been applied to these plots. 



Five hundred and 1,000 pounds of limestone have had no appreciable 

 effect on pH level and very little effect on promoting scab. 



A critical study of these data indicates that the amount of lime ap- 

 plied at one time has more influence on scab than any other factor. 

 Large applications of lime at one spreading are difficult to incorporate 

 thoroughly into the soil so that neutral or nearly neutral areas are 

 maintained by groups of lime particles not separated in the harrowing 

 and working of the soil through the years. For this reason small ap- 

 plications of lime are preferable in potato rotations. {Purnell Fund) 



Protein Requirements of Chickens 



Further experiments in feeding chickens varying levels of proteins 

 corroborate previous findings. 



1. Those groups receiving 19 per cent, protein level in rations 

 showed, generally, more rapid weight gains than those receiving low 

 protein rations during the first twelve-week period. The groups re- 

 ceiving fish meal as sole source of animal protein were most efficient in 

 weight gains and feed consumption. 



2. The dried skim milk fed groups showed the lowest mortality 

 with the mixed ration fed lots having the highest mortality. 



3. At the age of 161 days all groups showed production to some ex- 

 tent with the fish meal groups leading. The experiment was conducted 

 by A. E. Tepper, R. C. Durgin and T. B. Charles. {Purnell Fund) 



