POTASH MANURES 153 



turnips and swedes receiving fair dressings 

 of farmyard manure, potash can seldom be 

 employed at a profit, but where artificial 

 manures are alone depended upon in the 

 treatment of these crops it will not in- 

 frequently be found that potash is of the 

 utmost importance. Cases are known to 

 those who have followed experimental work 

 of recent years where, on light soil, no amount 

 of nitrogen or phosphates, unassisted by 

 potash, is capable of producing anything like 

 a full yield. Under these circumstances it 

 will be found that at an early stage the 

 turnip or swede plants get into an unhealthy 

 condition, which is indicated, not only by 

 feeble growth, but by a yellow blotchy 

 condition of the leaves. Where, therefore, 

 a farmer is dependent upon artificial manures 

 alone for the turnip or swede crop, he ought 

 to take steps to ascertain by a simple field 

 experiment whether he should apply a 

 potash manure, and in the great majority of 

 cases it will be found profitable to do so. 

 The potato crop is even more dependent 

 upon artificial assistance from potash than 

 the turnip crop, and even when farmyard 

 manure is employed an addition of potash 

 manure to the value of 10s. to 12s. per acre 

 will usually be found to be profitable. Potash 



