26 Experiment Station Bulletin 345 



sufficiently high level. If this occurs, the manure supply should be sup- 

 plemented with potash in commercial form. ( F. S. Prince, P. T. Blood, 

 G. P. Percival, P. N. Scripture) 



Field Corn Trials 



Nineteen local flint corns and two new dent hybrids were planted 

 at Greenland, New Hampshire, May 20, 1941. The plantings were made 

 at random in three replications for each sample. The plants were thinned 

 so there were three stalks to a hill with 22 hills to a plot. 



On September 10 the plants were topped, and on October 11 the 

 ears were snapped off and weighed. Twelve ears picked at random were 

 saved and dried down to about eight per cent moisture. The moisture 

 content was used to correct the acre yield so that all would be calculated 

 on an equal basis. 



Yield of grain corn varied from 46.47 down to 36.38 bushels per acre. 



These were rather low yields per acre since the rainfall in south- 

 eastern New Hampshire was way below average during the season. The 

 dent hybrids lead the flints in yield. These trials are continued during 

 1942. (Leroy J. Higgins) 



Silage Corn Trials 



In 1936 yield trials were started with fifty varieties of silage corn on 

 a farm in southeastern New Hampshire. Each year up to 1940 some 

 varieties have been discontinued because of low vields and various other 

 reasons. These plantings have been replicated three times with plots of 

 twenty hills and three stalks to a hill in each plot. 



In 1940, as a result of the earlier trials, four standard varieties, Sweep- 

 stakes, Sure Crop, Golden Queen, and Eureka Tuxpan, and one double 

 cross. Cornell 29-3, were planted as checks with seventeen of the newer 

 hybrids. The five foregoing varieties had led all the other varieties the 

 previous years in dry-matter yield per acre. 



During 1940 and 1941 three or four hybrids have shown promise for 

 silage corn in southeastern New Hampshire. Perhaps their yields have 

 not always been highly significant, but some have evidenced other desir- 

 able characteristics, like standing up better in the field. It is planned to 

 continue these trials another year. (Leroy J. Higgins) 



Dairy Farm Rotation Problems in Southern 

 New Hampshire with Sweet Corn as a Cash Crop 



Work on this project was continued during 1941 essentially as plan- 

 ned. A severe thought, which covered all of New England, affected 

 corn yields and reduced the effectiveness of heavy fertilizer applications, 

 particularly of side dressing with nitrate of potash. This fact is revealed 

 b) the comparative yields which averaged less in excess of half a ton in 

 1941 than for 1940. while the gains from side dressing were almost negli- 

 gible in 1941 when compared to a gain of oxer one ton per acre on the 

 average in 1940. 



Because the proportions of nitrogen and potash were held constant 

 in these fertilizers a comparison of phosphorus values is possible. For 

 the two years an average increase in yield of something over half a ton 



