June, 1940] AGRICULTURAL RESEARCH IN N. H. 21 



somewhat in 1939. As data for 1939 are not yet available, a seven- 

 year average for the yields of various plots up to and including the 

 1938 season is considered. 



One of the disturbing factors in this experiment is that fertilized 

 portions of the pasture are always grazed more heavily than unfer- 

 tilized portions. The plots are laid out side by side in the corner of 

 a large field with the check plots scattered among the treated plots. 

 The cows come into this area and feed heavily as the grass is better 

 there than anywhere else, manuring all the plots indiscriminately, of 

 course. Hence, it is likely that the check plot yields come nearer the 

 yields of other plots than would be the case were the plots fenced 

 and grazing controlled on each treatment. 



The response for complete fertilizers when compared with ecjual 

 amounts of nitrogen in the nitrogen-alone plots is distinctly disap- 

 pointing and differs materially from the results obtained on the 

 Livingston farm. 



On the Livingston farm in Claremont the experiment was modified 

 somewhat in the spring of 1938. The soil of these plots is much 

 more sensitive to a lack of minerals than the Seavey pasture. Maxi- 

 mum yields are not secured with nitrogen alone, and the complete 

 fertilizer plots yield more dry matter and proteins than those treated 

 wath either phosphoric acid and potash or nitrogen. On the plots 

 which had been treated for five years with only nitrogen, clover ap- 

 peared almost at once with the application of phosphoric acid and 

 potash. The entire vegetation, pasture palatability and length of 

 season of pasturing were all favorably changed, so starved was the 

 soil for phosphoric acid and potash. The principal difference between 

 the plots treated with phosphoric acid and potash and those on which 

 nitrogen only was applied was in the amount of wild white clover 

 which appeared abundantly in the plots that were generouslv sup- 

 plied with complete fertilizers or with phosphoric acid and potash. 



(Pvrnell Fund) 



A Dairy Farm Rotation in Southern New Hampshire with Sweet 

 Corn as Cash Crop 



This experiment on the Lane farm in Pittsfield was revised during 

 the past year to include sweet corn in the rotation instead of pota- 

 toes. The field is the same as that on which a three-year rotation 

 of potatoes, oats and clover has been grown during the past six years. 



Because of serious erosion, the field was divided into strips and 

 cropped on the contour. Nine such strips were laid out crossing pre- 

 vious treatments. 



Because the 1939 season was so dry that yields of corn were se- 

 verely cut. it is very doubtful if the data are of much value. No re- 

 sults, therefore, are being presented except the fact that onlv a 

 slight increase was obtained for nitrate of potash used as a top- 

 dressing. (Purnell Fund) 



Soil Survey of New Hampshire 



The survey of Hillsborough county, begun in the autumn of 1937. 

 was continued through the 1939 field season. It seems likely that 



