1902.] PUBLIC DOCUMENT — No. 33. 39 



When it is remembered that the clover seed which was 

 sown in large quantities came up abundantly upon all plots, 

 it is surely striking that it should have entirely disappeared 

 from every plot except those on which the potash fertilizers 

 have been applied. 



B. — Soil Test with Onions (North Acre) . 

 This experiment was conducted upon land which has been 

 used twelve years in soil test work. Each year each plot 

 in the field has been manured in the same manner. The last 

 four crops have been onions, and during the time that the 

 field has been used in experiments with onions it has re- 

 ceived double the quantities of fertilizers usually used in 

 soil tests; viz., for each fertilizer, wherever it is used, at 

 the following rates per acre : nitrate of soda, 320 pounds ; 

 dissolved bone-black, 640 pounds ; muriate of potash, 320 

 pounds. The plots in this field are long and narrow, about 

 210 feet by lO 1 /^ feet. One-half of each plot was limed in 

 the spring of 1899 at the rate of one ton per acre of quick- 

 lime, slaked, spread evenly after ploughing and harrowed 

 in. The crops grown in this field previous to the onions, 

 in the order in which they have been raised, are : potatoes, 

 corn, soy beans, oats, grass and clover, grass and clover, 

 cabbages and rutabaga turnips, and potatoes. The variety 

 of onions grown this year was Danvers Yellow Globe. The 

 seed germinated well ; but the plants on most of the plots 

 made little growth, and many soon died, especially on the 

 unlimed portions of plots which had received an application 

 of muriate of potash, or nitrate of soda, or a combination 

 of these without bone-black. The following tables show the 

 results, bulbs and tops being weighed together : — 



