The third the like dressing, without potash. Food for 



The fourth received the like dressing without nitrogen, Plants 

 and by way of control, each of these experiments was carried l6 s 

 out in triplicate, so that each of the eleven soils served for 

 twelve separate experiments. 



Buckwheat Grown with Nitrate of Soda, 75 Ibs. to the acre, alongside of 

 Corn, showing extraordinary height o c the Buckwheat. 



These soils represented both loam and sandy soils, and 

 the following table shows the relative yields under the dif- 

 ferent treatments for the different soils: 



Kind of Soil. 



Loam Sandy Sandy Loam 



Yield in 



Cms. Gms. Cms. Cms. 



Complete Dressing ...^ 99 88 88 79 



Complete without phosphoric acid 82 85 62 21 



Complete without potash 90 79 86 52 



Complete without nitrogen n 9 5 5 



It will be observed that with the complete dressings the 

 yields on all of the soils were the best, and that when phos- 

 phoric acid or potash was omitted from the complete dress- 

 ings the yield to the eye wa^diminished, though only slightly 

 in some cases. Weighing showed, however, that the yield 

 fell 17% as compared with the complete dressing, when the 

 phosphoric acid was omitted, and 19% when the potash was 



