Potash Fertilisers. 



[APRIL, 



Leguminous Crops. — 



Usual Application = 2 to 4 cwt. kainit, or 104 to 208 lb. 

 30 per cent, potash salts, or 64 to 128 lb. sulphate or 

 muriate of potash. 

 Crass Land. — On grass repeatedly cut for hay the quantity 

 of potash which can be liberated in the soil is probably already 

 very low. In such cases potash must be applied, and, if this 

 cannot be done by feeding on the land mangolds or other food- 

 stuffs containing potash or by applying farmyard or liquid 

 manure, potash in some other form should be given. 



* Usual Application = 2 cwt. kainit, or 104 lb. 30 per cent, 

 potash salts, or 64 lb. sulphate or muriate of potash. 



The potash manures recommended above should be given in 

 addition to the other manures recommended in Food Production 

 Leaflet No. 33, except where that leaflet prescribes blast 

 furnace flue dust, in which case the applications of kainit, 

 etc., now recommended, are to be understood as taking the 

 place of flue dust. 



Choice of Potash Manures. — As a rule, in deciding which form 

 of potash to use, the main determining factors should be the 

 price per unit and the cost of transport. For potatoes and 

 perhaps young " seeds," sulphate or muriate of potash is 

 generally to be preferred to kainit. Other crops respond about 

 equally well to all forms. 



Purchase of Potash. — Supplies of the following grades of 

 potash fertilisers are now, or will shortly be, available : — 



Kainit . . . . 14 per cent. K 2 



Potash Salts .. 20 K 2 



Potash Salts .. 30 „ K 2 



Muriate of Potash . . 80 ,, KG = 50 per cent. K a O. 



Sulphate of Potash . . 90 ,, K 2 S0 4 = 49 ,, 



For the 30 per cent, potash salts, muriate of potash and 

 sulphate of potash, maximum prices are in force. Full par- 

 ticulars are contained in Leaflet No. F.P. 501/S.1, which can be 

 obtained free of charge on application to the Ministry, 72, 

 Victoria Street, London, S.W. 1. 



Farmers who wish to purchase supplies of potash should place 

 their orders with their usual dealer or co-operative society. 



(This article is also issued as Leaflet No. 335.) 



* Where an average dressing of dung is given, the smaller quantities of 

 the manures mentioned should be used. 



