10 



N. H. Agr. Experiment Station 



[Bulletin 306 



are higher than tlie imtreated plots except that of the hay from the 

 10-20-20 series, which happens to have exactly the same protein con- 

 tent as the untreated plots. 



Table VI. Second Cuttings on Mathes Fai-i7i Plots. 



It seems quite apparent, therefore, that the major stimulation from 

 fertilizers applied at dates well ahead of the first crop harvest will be 

 secured in the first cuttin<r of hay. If it is desirable on the farm to se- 

 cure any considerable increase in second crop yields, it will be necessary 

 to apply the top-dressing fertilizers at a date somewhat nearer the time of 

 harvesting the first crop or perhaps soon after the first crop is cut. 



One trial is reported in this publication (Table XVI) in which the 

 nitrogen was applied immediately after the first crop was cut and in this 

 instance a significant increase in the second crop was noted. 



Dr. H. B. Sprague and his co-workers at the New Jersey Station re- 

 port using nitrogen ten and twenty days before the first crop of bay was 

 harvested, with some carryover of stimulation into the .second cutting. 

 It appears, therefore, that in the woi'k reported herein the fertilizer had 

 largely spent itself by the time of first-crop harvest because of the early 

 application of the material. 



O'Kane Field Experiments 



Another test was begun on the O'Kane farm field in 1933 to deter- 

 mine the relative effects of phosphoric acid and potash on grass hay pro- 

 duction. Applications of nitrogen alone have there been contrasted with 

 nitrogen aixl i)hosphoric acid in both Ammo Phos A. 11'^ N, 48% P"0>i 

 and nitrogen and superphosphate, also with nitrate of potash, 13% N, 

 44% KaO, with a mixture of Ammo Phos A and nitrate of potasli, as well 

 as with a superphosphate-potash mixture. 



This field was fonneily old hay land which bad not been plowed for 

 many years. The tield was plowed in tlie fall of ]U:V2. manured at the 

 rate of 20 tons per acre, fertilized with 300 pounds of an 8-16-16 fer- 

 tilizer per acre and seeded to a mixture of timothy and alsikc clover in 



