Agricultural Research in N. H. 23 



starch content, thus affecting the specific gravity, whereas the Katahdin va- 

 riety did not respond to potassium sulphate in the same manner. It is also 

 interesting to note that potatoes with the highest specific gravity, hence the 

 highest starch content, both in the Green Mountain and Katahdin varieties, 

 were those on which no fertilizer was applied. Even here the Green Mountain 

 variety showed more variation than the Katahdin. 



These data are supported by work at Northwood Ridge, where the 

 Katahdin variety was grown under a variety of treatments with complete fer- 

 tilizers also without potash and without phosphorus in certain series. The 

 omission of potash reduced the yield much more than the omission of phos- 

 phorus. Again, the Katahdin variety failed to respond to variations in sul- 

 phur and chlorine applications. 



F. S. Prince, P. T. Blood 



The Relative Efficiency of Plowing Down Fertilizers 



This project is conducted on a Paxton soil in the corn processing area 

 near Pittsfield. Four methods of applying fertilizer for the sweet corn crop 

 are under study: (1) all of the fertilizer placed on the plow sole; (2) half 

 placed on the plow sole and half applied with the planter; (3) half applied 

 with the planter and half side-dressed at the time of the second cultivation; 

 and (4) all of the fertilizer applied with the planter. 



The two-year average yield for each treatment follows: 



Tons of green 

 Treatment corn per acre 



(1) All on plow sole 5.606 



(2) Half on plow sole, half with planter 5.677 



(3) Half with planter, half side-dressed 5.794 



(4) All with planter 5.276 



Results to date indicate that a somewhat larger yield is obtained by 

 plowing under part or all of the fertilizer, or by delaying part of the applica- 

 tion until mid-season rather than applying all of it with the planter at plant- 

 ing time. 



F. S. Prince, P. T. Blood 



The Production of Seed for Forage Crops 



Severe winterkilling, due to ice cover in the early months of 1946, de- 

 stroyed perennial red clover seedings to the extent that no seed was harvested 

 during the season. In sipte of the nearly nine inches of rainfall in August, 

 a one-acre plot of a late timothy strain was combined. Although about half 

 of the seed from each head had shattered due to beating rains, a yield of 75 

 pounds of seed per acre was obtained. 



A quantity of two strains of smooth brome was harvested by hand on 

 August 6. This was later threshed with a head thresher and cleaned with 

 a fanning mill. No attempt was made to determine acre yields, although the 

 two strains varied greatly in number of seed stalks and amount of seed pro- 

 duced. 



