April, 1935 j 



Agricultural Research in N. H. 



11 



results, followed by nitrate of soda, calcium nitrate, sulphate of ammonia, 

 and cyanamid, in the order named. Twenty-five pounds of nitrogen per acre 

 returned considerably more than half as much dry matter and protein as 50 

 pounds per acre. Complete fertilizer gave significant increases in the yields. 



In the pasture experiment at Greenland, on the other hand, there was 

 little response from minerals other than nitrogen. Sulphate of ammonia 

 gave the best response of the nitrogen carriers, with nitrate of soda second. 



In pastures where Dutch Clover forms a part of the stand, there have 

 been significant increases from applications of phosphoric acid and potash, 

 while grass responds mainly to nitrogen. (F. S. Prince, P. T. Blood, T. G. 

 Phillips, and G. P. Pcrcival — Purnell Fund.) 



Time of Cutting Hay 



As in previous years, the experiments indicate that very good hay for 

 feeding cows can be made from timothy if it is cut early. The cutting on 

 June 10 showed a significant increase in pounds of protein per acre over 

 later cuttings as did the second cutting on these plots also. In 1933 the heav- 

 iest total yield was recorded for the July 30 cutting. This is contrary to 

 results from former yields when the heaviest cutting usually came July 10 

 or July 20. Whether this is due to the accumulative effect of harvesting 

 later or to seasonal factors is not yet known. (F. S. Prince and P. T. Blood 

 — Purnell Fund.) 



Nutrition Studies with Dairy Cows 



The study of the comparative nutritive value of different varieties of 

 hay which has been carried on in connection with the physiological investi- 

 gation on the nutrition of dairy cows was extended to alsike clover hay and 

 red clover hay. The relative availability for dry cows of protein and of 

 energy, (metabolizable energy), per 100 pounds, of the forages so far stud- 

 ied is as follows : 



Per 100 Pounds of Hay 



Red clover hay, it will be observed, stands relatively low as a source of 

 energy but as a source of digestible protein it ranks very close to alfalfa. 

 Alsike ck)ver hay is at the bottom of the list of legumes as a source of di- 

 gestible jirotein although it contains somewhat more available energy than 



1st cutting alfalfa or red clover. 



