204 



NITROGEN, PHOSPHORUS AND POTASSIUM 



bonate of lime and moisture, the muriate may give as good results 

 as the sulfate. 



Kainit is much used in the South. 



FIG. 135. 



FIG. 135. For corn (in a pot test) this peat soil responded to phosphate treatment. 

 O, no treatment; N, nitrogen fertilizer; P, phosphate treatment; K, potash; PK, 



phosphate and potash. (See Figure 136.) 



FIG. 136. For cabbage, potash fertilizer gave the greatest response. Same soil as in 

 Figure 135. A, response to phosphate; B, response to potash. 



Wood ashes are excellent for acid, peat soils. From one to two 

 tons per acre is a common application. 7 No mixture of commercial 

 fertilizers gives the results on acid marsh soils as do ashes. 



7 When containing 30 to 40 per cent moisture. 



