May, 1937] Agricultural Research in N. H., 1936 13 



Silage corn is the first crop grown on these plots which has given 

 larger differences with superphosphates than with potash. 



In general the plots that received manure and phosphoric acid as 

 ^•ariables gave significant differences, while potash used by itself had 

 veiy little effect upon corn yields. This would indicate that corn either 

 is not so responsive to potassic fertilizers or was able to extract its 

 potash requirements from the manurial application. 



Top-Dressing Old Pastures. In the 18 plots conducted on the Seavey 

 pasture, Greenland, the application of superphosphate and jwtash ap- 

 pears to be stimulating gro\^'th more than during the first three years 

 of the test. White Dutch clover made its appearance on such plots in 

 1935 and has become more abundant in 1936. 



The nitrogen carriers for 1935 ranked in the following order in stim- 

 ulating production: nitrate of soda, sulphate of ammonia, cyanamid. 

 For the complete fertilizers the cyanamid basic slag mixture gave the 

 highest yields. 



Similarly, in 18 plots conducted on the Livingston farm near Clare- 

 mont, the average yields of 5 nitrogen carrier plots in 1935 amounted 

 to 394 pounds of protein per acre, whereas the average of four complete 

 fertilizer plots was 579 pounds protein. 



The nitrogen carriers in this test ranked as follows in 1935; nitrate 

 of soda, calcium nitrate, cyanamid, cal nitro, and sulphate of ammonia. 



Practically no clover appears on the plots where nitrogen alone is 

 applied, but phosphoric acid and potash, or one of these elements with 

 nitrogen, bring in abundant clover a few weeks after treatment. The 

 clover response to minerals on this soil is perhaps the most remarkable 

 thing about the test, and the method of fertilization is applicable to a 

 large specialized daiiy fanning section of New Hampshire. {Purnell 

 Fund) 



A Soil Survey of New Hampshire 



The soil survey of New Hampshire, which was started in 1935, was 

 continued in 1936 in two areas — Sullivan County was completed, and 

 Cheshire County is about one-third completed. About one half of Coos 

 County was surveyed in 1936. The work in Cheshire County was done 

 by C. S. Simmons of the U. S. Bureau of Soils, assisted by W. H. Ly- 

 ford of our staff. The Coos survey was under the supervision of B. H, 

 Williams of the Bureau of Soils assisted by W. H. Coates of our staff. 

 The Grafton County survey, which was completed in 1935, will be pub- 

 lished shortly. The Sullivan and Cheshire surveys will be published 

 together after the Cheshire area has been finished. (Purnell Fund) 



Grass Hay Top-Dressing 



That the date of applying nitrate of soda makes considerable differ- 

 ence in yield is shown in the study conducted for three years by F. S. 

 Prince and P. T. Blood on the Mathes field at Durham. Applications 

 of 200 pounds on April 5, April 15 and April 25 yielded respectively 

 averages of 1207, 1762, and 1977 pounds per acre. Apparently the 

 earliest application w^as leached before the plants had an opportunity 



