98 



POTASH EXPERIMENTS. 



Potatoes (Arran Chief). Sawpit Field, 1921. 



With Dung. 12 tons per Acre. 



3 cwt. Super 

 3 cwt. Super 

 3 cwt. Super 

 3 cwt. Super 



1^ cwt. Sulphate Ammonia, 470 lb. Sylvenite 

 IJ cwt. Sulphate Ammonia, 



1^ cwt. Sulphate Ammonia, Ih, cwt. Sulphate Potash 

 1^ cwt. Sulphate Ammonia, 1| cwt. Sulphate Potash, 

 95 lb. Sulphate Magnesium ... 

 No Manure. Control 



3 cwt. Super., 1^ cwt. Sul. Amm., 1^ cwt. Muriate Potash ... 

 3 cwt. Super., 1^ cwt. Sul. Amm., l^cwt. Muriate Potash, 84 lb. Sul 

 Magnesium 



Without Dung. 



Tons. 



3-57 



3-55 



I 3-67 



*307 



*2-28 

 *2-31 



*2-43 



Tons. 

 *315 

 *3-18 



4-27 



392 

 348 

 4-24 



Tons. 

 3 71 

 372 

 388 



387 

 318 

 397 



2 cwt. 

 2 cwt 



4 cwt. Super., 2 cwt. Sul. Amm., 625 lb. Sylvenite 

 4 cwt. Super., 2 cwt. Sul. Amm. ... 

 4 cwt. Super., 2 cwt. Sul. Amm., 

 4 cwt. Super., 2 cwt. Sul. Amm. 

 No Manure. Control 

 4 cwt. Super., 2 cwt. Sul. Amm., 

 4 cwt. Super., 2 cwt. Sul. Amm., 

 Magnesium 



Sul. Potash ... 

 Sul. Pot., 127 lb. Sul. 



Mag 



2 cwt. Muriate Potash 



2 cwt. Muriate Potash. Ill lb. Sul 



311 

 115 

 352 

 325 

 165 

 400 



3 63 



390 , 415 I 



Potatoes (Arran Chief). Sawpit Field, 1921 



4 cwt. Super., 2 cwt. Sulphate Ammonia, 232 lb. Sul. Potash 

 4 cwt. Super., 2 cwt. Sulphate Ammonia 



4 cwt. Super., 2 cwt. Sulphate Ammonia, 54 cwt. Sylvenite 

 Control. No Manure. 



300 I 246 I 2-82 



116 ! 098 I 089 



'1 93 336 I 304 



'073 1 10 ' ri6 



Potatoes (Kerr's Pink). Great Harpenden Field, 1922. 



With Dung 15 tons per Acre. 



j Basal Manuring ( = Super. 4 cwt., Sul. Amm. 15 cwt per Acre) ... 8'78 I 7"72 



; Sulphate Potash 183 lb. + Basal Manuring ... ... ... ... { 949 I 972 



j Muriate Potash 148 lb. + Basal Manuring ... ... ... ... j 9 22 960 



I Muriate Potash 148 lb. + Salt 497 lb. + Basal Manuring 984 I 9'49 



7-60 

 945 

 882 

 914 



Without Dung. 



Basal ( = Super. 6 cwt.. Sulphate Ammonia 2 cwt. per Acre) 



Sulphate Potash 244 lb. 4- Basal 



Muriate Potash 197 lb. + Basal 



Muriate Potash 197 lb. + Salt 662 lb. + Basal 

 Muriate Potash 197 lb. Sulphate Magnesium, 344 lb. 

 Muriate Potash 197 lb. Salt 662 lb. + Basal ... 

 No Manure 

 Sulphate Potash 244 lb. Sulphate Magnesium 344 lb. 



Cement Works' Dust 614 lb. 4- Basal 



Svlvenite 541 lb. + Basal 



+ Basal 



+ Basal 



Produce per Acre. 



* On these plots the bouts were badly broken down due to extra hoeing on account of the growth of Wheatbind. 



Mangolds (Prizewinner Yellow Globe). 

 Great Harpenden Field, 1922. 



