results obtained, and was true of all crops tried, 

 except wheat. Unacidulated fertilizers always con- 

 tain more phosphoric acid than the same fertilizers 

 acidulated, as the weight of the acid used displaces 

 some of the material, and if organic matter is used 

 with the former, the conditions thus created in the 

 soil give it additional life which takes the place of 

 acidulation, and results in greater fertility. A num- 

 ber of lay experiments and actual practice in Cali- 

 fornia agree with the results of the Pennsylvania 

 State Experiment Station. Where there was little or 

 no humus-forming material in the soil, acidulated 

 forms gave the best results. 



SOURCES OF POTASH. 



Potash is found as a chloride, or muriate, as a 

 sulphate, and in a crude form called .kainit. The 

 latter contains 12%% actual potash. The muriate 

 and sulphate analyze about 50% actual potash. 

 The Stassfurt mines of Germany supply the most of 

 this product. 



The potash of manufactured fertilizers is seldom 

 all animal matter. All forms dissolve readily, so 

 there is no danger of buying potash in unavailable 

 form. It takes about two pounds of sulphate, or 

 muriate, of potash to make one pound actual potash, 

 or 10% sulphate to make 5% "actual." 



Wood ashes and stable manure are also sources 

 of potash, obtainable however, in very limited quan- 



15 



