10 N. H. Agr. Experiment Station [Bulletin 262 



Fertilizers were then applied according to the plan of the experi- 

 ment, including a test of different phosphorus and nitrogen carriers, 

 a comparison of annual and triennial applications of phosphatic and 

 potassic fertilizers as well as a check-up on ready mixed vs. home mixed 

 materials. (Purnell Fund) 



Time of Cutting Hay 



Harvesting was started June 10 and continued at ten day intervals 

 until July 30 on a series of hay plots on the University Farm in order 

 to determine further the best time of cutting. 



After each harvest the hay from the plots was transported to a drier, 

 especially constructed for this purpose, and evaporated to an air dry 

 basis. 



The grass hay had the greatest amount of protein on June 10, the 

 greatest percentage on June 10, but did not reach the heaviest yield of 

 hay until July 20. 



A second cutting made on September 2 proved that cutting as early 

 as June 10 under Durham conditions does not lower the yield of the 

 rowen. The work was done by F. S. Prince and P. T. Blood. (Hatch 

 Fund) 



Fertilizer with Potatoes 



A series of fertilizer tests conducted over a period of years on pota- 

 toes by F. W. Taylor has shown the following facts: 



Varying grades of potash in a nine-year average have produced the 

 following yields per acre on clay soil: 4-8-0, 214 bushels; 4-8-3, 239 

 bushels; 4-8-6, 263 bushels; 4-8-10, 268 bushels; check 161 bushels. 



Placement tests above, below, at the side of, and with the seed in a 

 five-year average have shown a difference of only seven bushels in the 

 yield. In three years the lowest yield has been with the fertilizer 

 above the seed ; but last year, due probably to heavy rains after plant- 

 ing, this placement showed a higher yield by 26 bushels than any of the 

 others. 



Manure, applied at the rate of 12 tons per acre, has given yields in a 

 5-year average of 225 bushels, compared with 260 bushels for a 24-ton 

 application and 140 bushels for the no-manure plots. At the 12-ton 

 rate the manure has been worth $8.17 per ton on the average, at the 

 24-ton rate, $5.61. 



Sulphate of ammonia in the 4-8-4 fertilizer in a four-year average 

 does not show up as well as does nitrate or a mixture of sulphate and 

 nitrate. Yields have averaged : Nitrate, 280 bushels ; mixed, 279 bush- 

 els; sulphate, 264 bushels. 



A concentrated grade, 16-32-16, or Nitrophoska, has given nearly as 

 good results as four times as much 4-8-4. In a four-year average the 

 former yields have run to 264 bushels and the latter to 279 bushels. 

 While the average yield has been about 15 bushels less, it should be re- 

 membered that the concentrated fertilizer costs less per unit of plant 

 food. No injurious effects upon the plants have been noted from its 

 use. (Hatch Fund) 



