92 



STRAW EXPERIMENT, 1921. 



Potatoes (Arran Chief). Sawpit Field. 



Single Nitrogen represents 1 cwt. Sulphate of Ammonia added to 1 ton of straw. 

 Double Nitrogen represents 2 cwt. Sulphate of Ammonia added to 1 ton of straw. 



RESIDUAL VALUE OF SLUDGE, 1921. 



Long Hoos Field. 



Treatment of Plots 

 in 1920. 



Manure per Acre. 



Dressed Grain. 



Yield per 

 Acre. 

 Bush. 



Weight 



per Bushel. 



lb. 



Offal Grain 

 per Acre. 



lb. 



Straw per Acre. 



Total 

 Straw. Straw, 



lb. cwt. 



1st 2nd 1st 2nd 1st 2nd ! 1st 2nd 1st 2nd 

 Plot. Plot. Plot. Plot. Plot. Plot, i Plot. Plot. Plot. Plot. 



Proportion 



of 



Total Grain 



to 100 of 

 Total Straw. 



1st 



2nd 



Plot. Plot. 



1921, Wheat (Red Standard) after Potatoes (1920).'= 



Activated Sewage 

 Sludge, 13 3 tons 



Farmyard Dung 

 15 tons 



Control 



29-8 127-9 



348 

 260 



[316 



269 



640 



640 

 63 3 



641 



641 

 630 



371 



296 

 342 



406 



371 

 325 



2925 



2461 

 2299 



2624 



2600 

 1997 



327 



303 

 262 



308 622 636 



29-7 

 266 



745 

 67 6 



720 

 677 



1921, Wheat (Red Standard) after Barley (1920).t 



Sulph. of Ammonia 



145 cwt. 

 Activated Sewage 



Sludge, 27 tons 

 Control ... 

 Control 



24-1 



30- 1 



272 



27-4 



630 



630 

 62- 5 

 r.3 



387 



351 

 405 

 435 



2738 



2857 

 2738 

 2333 



311 



314 

 294 

 303 



546 



641 

 63 9 

 637 



* In 1920 this set received a basal dressing of 6 cwt. Super, and 1 cwt. 

 Nitrate of Ammonia per acre. No manure was given in 1921. 



1 In 1921 this set was manured as farm, viz., 1 cwt. Sulphate of Ammonia 

 and 1 cwt. Superphosphate per acre. 



