14 HATCH EXPERIMENT STATION. [Jan. 



the use of fertilizers only, and indicate that in grass mixtures 

 where clover is sown exceedingly profitable crops can be 

 grown by the combination of a potash salt and an available 

 phosphate. B. Soil test with onions. Results indicate 

 the close dependence of this crop upon a liberal supply of 

 potash, the vital importance of an abundant store of lime for 

 the healthy growth of the crop, and of a liberal supply of 

 readily available phosphate for promoting satisfactory ripen- 

 ing of the crop. 



IX. — To determine the relative value for production of 

 corn and grass in rotation of a large application of manure 

 alone, as compared with a smaller application of manure 

 with a moderate amount of potash salts. The crop of this 

 year is mixed grass and clover. The result of the experi- 

 ment was the production of nearly equal total weights of 

 hay under the two systems, and hay of superior nutritive 

 quality, because containing a larger proportion of clover, 

 on the combined manure and potash. 



X. — To determine the relative value for crop production 

 of two fertilizer mixtures, one furnishing the important ele- 

 ments of plant food in the same proportions as in "special" 

 corn fertilizers, the other furnishing less phosphoric acid 

 and more potash, for corn and grass in rotation. The crop 

 of this year is grass, and the mixture containing less phos- 

 phoric acid and more potash and costing the smaller sum per 

 acre gives a larger yield both of hay and rowen, and in both 

 cases of superior nutritive value on account of the large 

 proportion of clover. 



XI. — To determine the economic result of using in rota- 

 tion on grass lands : the first year, ashes ; the second, ground 

 bone and muriate of potash ; and the third, barnyard manure. 

 The yields are large, amounting under these several systems 

 of manuring to from rather over 31/4 to nearly 3% tons per 

 acre. These yields are produced on a good margin of profit. 



XII. — To determine whether the use of nitrate of soda 

 for rowen is profitable. The results on an old sod consist- 

 ing chiefly of Kentucky blue-grass is an increased rowen 

 crop, resulting from the application of nitrate of soda at a 



