510 Field Experiments on Root-Crops. 



merits on swedes ; Mr. Vallentine on swedes, mangolds, and 

 potatoes ; and Mr, Hetherington on potatoes. 



Kxperimeyits on Swedes at Mr. Kimbers Farm, Tuhney Wari'en, 

 Ahingdon, in 1866. — The trial-field, a poor sandy soil, was 

 cropped in 1862 with wheat, top-dressed with nitrate of soda 

 after clover; in 1863, it grew swedes with dung and superphos- 

 phate ; in 1864 barley ; and in 1865, peas without manure. No 

 dung or artificials, except those mentioned in the experiments, 

 were applied to the land after the pea-crop. 



The soil, as will be seen by the subjoined analysis, was such 

 that potash might be supposed to have a good chance of 

 exerting a beneficial influence on swedes : — 



This soil contained in 100 parts : — 



Moisture (when analysed) •82 



Organic matter and water of combination . . 2*45 



Oxides of iron and alumina 3'13 



Lime 'li 



Phosphoric acid "04 



Sulphuric acid '19 



Magnesia and allcalies '47 



Carbonic acid traces 



Insoluble silicious matter (sand) 92'99 



100-23 



The potash-salts and common salt were applied to the land 

 broadcast before the seed was drilled, and the superphosphate and 

 seed were drilled on the 26th of June. 



The crop, being a late one, was left on the land until the 27th 

 of December, when the roots were taken up, cleaned, and 

 weighed. The following results were obtained : — 



Pkoduce in Clean Swedes of Seven Experimental Plots of 5'g of an Acre 

 each, at Tubney Warken, Abingdon. 



Superphosphate 

 J Superphosphate 



and 

 Common salt . . 

 I Superphosphate 



and 

 Crude potash-salts 

 Is'o manure 

 Common salt . . 



Crude potash-salts 

 Superphosphate 



Quantity 

 ol' Manure 

 per Acre. 



cwts. 

 3 

 3 



Increase 



tons. cwts. lbs. 

 5 3 96 



3 G4 



6 1: 



IG 



11 108 

 (decrease) 

 13 44 

 6 18 44 



