338 



BOARD OF AGRICULTURE. 



Potash-Magnesium Sulphate. 



I. 



(Collected of Bowker Fertilizer Co., Boston, Mass.) 



(Collected of Messrs. Brown & Warner, Northampton, Mass.) 



These two samples represent a brand of "German potash- 

 salts " which is highly recommended for deep-rooting plants, 

 as clover, beet-roots, etc., on account of the exceptional rapid 

 diffusion of its potassa throughout the soil, in consequence 

 of the presence of magnesium sulphate. The absence of 

 chlorides renders it also the safer article for various special 

 industrial crops, as tobacco, sugar-beet, and potatoes. 



Ashes from Blue- ]VorLs. 

 (Sent by H. E. B. Waklron, New Bedford, Mass.) 



The commercial value of this refuse article consists in its 

 potassium oxide, which is present mainly in the form of 

 sulphate. The peculiar origin of this material advises some 

 precaution in regard to its use in a fresh state, as it may con- 

 tain still some cyan and sulpho-cyan compounds which are 

 known to be injurious to plant-growth. The moist crude 

 material should be exposed to the air for some time in a 



