1920.] 



Compound Manures. 



iigi 



analyses, but only such as do not interact on each other 

 chemically should be used for this purpose (see above). 



In each case the percentage composition of the mixture has 

 been ascertained by multiplying the weight (in cwt.) of each 

 manure by its content of nitrogen, phosphate or potash, as the 

 case may be, and dividing by the total weight of the mixture. 

 The manures used are sulphate of ammonia containing 20 per 

 cent, of nitrogen, superphosphate containing 30 per cent, of 

 soluble phosphate, steamed bone iiour containing i per cent, 

 of nitrogen and 60 per cent, of insoluble phosphate, and sulphate 

 of potash containing 49 per cent of potash. Maximum selling 

 prices have been arranged for potash manures and sulphate of 

 ammonia, particulars of which are set out in circulars F.P. 

 501/S1 and F.P. 495/81. Copies of these circulars may be 

 obtained on application to the Ministry at 72, Victoria Street, 

 London, S.W. i. 



Wheat, Oats, Barley. — For application at seed time, or early spring 



for wheat after a corn crop and not yet manured — 

 Sulphate of ammonia, f cwt. = f x2o X4/13 = 4-6 Nitrogen, 

 Superphosphate, ij cwt, = 3/2 X30 x4/i3 = i3-8 Sol. phosphate. 



steamed bone flour, * cwt. = i f ''^''^ = ^'■t'-^f'i- ^ ^ 



^ x6o X 4/1 3 =9 '2 Insol. phosphate. 



Sulphate of potash, J cwt. = J X49 X4/13 = 7-5 Potash. 



The percentage and composition of the mixture is, therefore : — 



4-7 nitrogen, 13-8 soluble phosphate, 9-2 insoluble phosphate, 



7*5 potash. 



Mangolds. — For application at seed time — Per cent. 



I J cwt. Sulphate of ammonia . . ^ / Nitrogen 5.7 



2I ,, Superphosphate ../ . . \ Sol. phos. 14.3 



I „ Steamed bone flour .. C contammg ^ j^^^^^ ^^^^^ 



f ,, Sulphate of potash ..) (^Potash 7.0 



In addition it is advisable to apply separately about 4 cwt, 

 per acre of common agricultural salt. 

 Swedes, Turnips. — For application at seed time — Per cent. 



I cwt. Sulphate of ammonia . . \ ( Nitrogen 3 -o 



3 ,, Superphosphate ..( .. ) Sol. phos. 17-1 



I Steamed bone flour . . C ^ontammg < ^^^^^^ ^^^^^^ ^^^^ 



8J ,, Sulphate of potash . . J ( Potash 4-7 



Potatoes, Carrots. — For application at planting and seed time — 

 I i cwt. Sulpliate of ammonia . . i ( Nitrogen 3 -9 



3| ., Superphosphate ••( containing J ^ol- Pl^f- ^6-2 



i ,, steamed bone flour .. ° ) Insol. phos. 7-0 



I ., Sulphate of potash ( Potash 7-5 



Beans, Peas, Lucerne, Sainfoin. — For application at seed time for 

 beans and peas, and as a spring top-dressing for lucerne and 

 sainfoin— Per cent. 



\ cwt. Sulphate of ammonia . . ^ ^ Nitrogen 2 -o 



3J Superphosphate C containing . P^°'- ^^'i 



I Steamed bone flour .. C ^ y Insol, phos. 10-9 



J ,, Sulphate of potash v Potash 4-5 



