May, 1938] 



Experiments With Grass Hay 



13 



These data are rather surprising in that they indicate practically no 

 difference between the stimulation from fall and spring applications of 

 nitrogen applied at the dates studied. The results are somewhat at 

 variance with commonly accepted views on the subject and are probably 

 accounted for to some extent by root absorption of the fall-applied nitro- 

 gen which was stored during the winter and translated into growth dur- 

 ing the spring months. 



Cyanamid, too, was applied both fall and spring in this test. The 

 fall application was made in November, just before the ground froze, 

 and the spring treatment was made usually around April first, after the 

 frost was out of the soil but before growth started to any extent. Two 

 hundred pounds of cyanamid per acre were used in both tests. 



Table IX. Spr'ing and fall applications of cyanamid on O'Kane 



farm plots. 



Both treatments gave significant increases over the check plots but 

 the ditference between the two treated series is very slight, and not sig- 

 nificant. 



This appears to indicate that cyanamid may be safely applied as a 

 top-dressing in late fall, a factor which might be advantageous to avoid 

 the rush of spring work, or on land that is normally too wet to get over 

 with a team and spreader in the spring at a time when cyanamid should 

 be applied. 



A similar comparison was made with a complete fertilizer. In this 

 case a heavy application of a 4-8-7 formula, 1,000 pounds per acre, was 

 made. The 40-pouud nitrogen application was thus constant for all 

 these trials. Applications were made in September and April, at the 

 same time as nitrate of soda. 



Table X. Spring and fall applications of a complete fertilizer on the 



O'Kane farm plots. 



The treatments both exhibit significant differences when compared 

 with the checkplot series ; likewise the differences between the spring 



