Field Experiments on Root- Crops. 



509 



Mangold Experiments at Hknfield, Bewdley. 



Plots 



25 of 

 an Acre, 



Manure per o'o of an Acre. 



Farmyard-manure 1 ton 



Farmyard-manure 5 ton, and dissolved bone-'' 



ash 22i lbs.* / 



Dissolved bone-ash 22i lbs. 



No manure 



Crude German potash-salts 22^ lbs 



Common salt 22 i lbs 



Dissolved bone-ash and crude potash-salts each 



22§ lbs 



Dissolved bone-ash and common salt each) 



22ilbs J 



The manures and seed were sown towards the end of April. 

 The highest produce was not equal to that of 2 J acres of adjoining 

 mangolds, which were manured with IG tons of farmyard- 

 manure and 4 cwts. of Proctor and Ryland's mangold manure, 

 viz. nearly 35 tons per acre. 



It appears in these experiments ; — 



1. That crude potash-salts applied alone gave an increase of 

 not quite 2 tons per acre. 



2. That salt alone had a better effect than crude potash-salts. 



3. That the mixture of potash-salts and superphosphate pro- 

 duced the largest increase of any of the experimental plots, 

 amounting to 17 tons 15 cwts., and more than doubling the yield 

 of the unmanured portion of the field. 



4. That the addition of common salt to superphosphate had 

 likewise a very good effect, but fell short by 3 tons per acre of 

 the effect from potash-salts and superphosphate. 



On the whole, the application of crude potash-salts was 

 successful, and it is worthy of notice that their mixture with 

 superphosphate produced a considerably heavier yield than 

 a large dressing of dung. The same mixture, according to my 

 experience, is very useful upon clover seeds, as will be seen by 

 a reference to my paper on clover experiments in last year's 

 Journal. 



Field Experiments on Roots in 186G. 



The experiments which I have to report for 1866 were made 

 on the farms of Mr. James Kimber, Mr. Robert Vallentine, and 

 Mr. W. H. Hetherington. 



Mr. Kimber tried the crude potash-salts in two series of experi- 



* Equivalent to 4 cwts. per acre. 



