314 



SYSTEMS OF MANURING CROPS 



[chap. 



An abstract from these experiments shows the 

 following average results obtained from io8 plots 

 during the years 1S92-94: — 



Table XCI.— Yield of Tirnips with different Fertilisers. 



Unmanured 



Superphosphate and Basic Sl.ig (7^ cwts. only) . 

 Superphosphate (6 cwts.), Sulphate of Ammonia (|) 

 Superphosphate (6 cwts.), Nitrate of Soda (i cwt.) 

 Basic Slag (9 cwts), Nitrate of Soda (l cwt.) 

 Hone Meal (4 cwts.), Nitrate of Soda (J cwt.) 

 Superphosphate, Babic Slag, Nitrate of Soda (i cwt.) 

 Superphosphate, Basic Slag, Nitrate of Soda (2 cwts.) 



IlooU 

 per acre. 



Tom. 



"•3 

 17-9 

 189 

 191 

 1 8-4 

 170 

 ' 19-2 

 194 



It will be scon that in these experiments the 

 phosphatic manures are the most effective in producing 

 an increased yield ; phosphate alone put up the crop 

 from 1 13 to 17-9 tons per acre: i cwt. of nitrate of 

 soda or sulphate of ammonia only add about another 

 ton to tlie crop, while a second hundredweight produced 

 no perceptible increase at all. 



The question of the most appropriate manurial 

 treatment for Swedes depends upon how much farmyard 

 manure is available ; while the ordinary four-course 

 rotation is being practised, most of the dung made will 

 come back to the land for the Swede crop, about 10 tons 

 to the acre being available. Of course, with such 

 quantities of farmyard manure the Swedes will require 

 no further nitrogenous dressing; phosphates are, however, 

 still indispensable. In such cases it is generally the 

 custom to finish off the seed-bed preparation with a 

 ridging plough, and to apply the dung to the furrows 

 just before sowing. The ridges are then split back over 

 the dung, the new ridges thus formed are rolled, and 



