Jan., 1924] PROGRESS OF AGRICULTURAL EXPERIMENTS 31 



a coat of manure was harrowed in in the spring. Chemical tests showed the 

 land to be strongly acid, and 3| tons of ground limestone were applied. A strip, 

 however, tlu-ough the centre of the piece was left unlimed. The land was 

 inoculated with soil from an old bed of sweet clover. The soil was applied 

 with the fertilizer sower. An uninoculated strip was left through the centre 

 of each half. In order to note the effect of different methods of seeding, one- 

 half of the plot was seeded June 16 with oats as a nurse crop and the other 

 half August 3 without a nurse crop. The oats were cut for hay August 8. 

 Both halves went into winter quarters in good condition with a very uniform 

 stand. 



Foreign Clovers. 



The small plots of clovers seeded in the grass garden in 1922 developed 

 reasonably well and fairly uniformly with the exception of the Hungarian, 

 reports F. W. Taylor. The Hungarian never developed more than one-half 

 of a good stand, possibly due to poor germination. The winter proved rather 

 disastrous to these clovers. Practically none of the foreign clovers survived 

 and even the two local varieties were much thinned out. The few plants that 

 came up this spring among the foreign clover plots showed evidence of having 

 developed from stray seeds of native clover rather than from the imported 

 seed. The plots of local seed developed only very mediocre stands this sum- 

 mer, and our conclusion is that these plots must have been exposed to rather 

 severe changes in winter temperature in spite of the general heavy snow-cover- 

 ing, possibly due to their location on a knoll subject to considerable sweeping 

 by the wind. However, the indications are that the local clovers were more 

 resistant to the rigors of winter than any of the foreign varieties, as these two 

 varieties were planted on either side of the foreign plots and both gave a partial 

 response this season. 



Effect of Climate on Productiveness. 



The data secured during the year on this project were in substantial agree- 

 ment with that obtained the previous season, reports 0. Butler. Seed of the 

 same strain of potatoes is being grown simultaneously in Maine and New 

 Hampshire, the object being to determine whether deterioration actually 

 occurs in southern New Hampshire and if so, what form it takes. In 1921, 

 the New Hampshire grown seed yielded 1.83 times less than the Maine grown 

 seed, and in 1922, 1.49 times less. The above figures are remarkably consistent 

 and might be taken as giving substance to the belief that potatoes in southern 

 New Hampshire do run out ; but to interpret them in this manner would be to 

 give them too much weight. They actually show that potatoes may run out, 

 but no other conclusion can be safely drawn from them. 



Spraying Potatoes. 



An experiment was carried out with 8-4-50 Bordeaux mixture for the pur- 

 pose of studying the effect of number of nozzles, pressure and size of caps on 

 control of late bUght, but the results obtained were questionable, since most 

 of the rotten tubers found were in those parts of the field in which the grower 

 was troubled with rather a heavy growth of witch grass. 



