1921.] 



Notes on Manures for November. 



757 



can therefore go on before the clover is sown so as to allow 

 ample time for the full effect to be produced. 



The Cockle Park experiments show that the clover ley con- 

 stitutes the most convenient and profitable place in the rotation 

 for the introduction of basic slag. 



Professor Gilchrist's Method of using Waste Lime. — Th& 

 writer recently had an opportunity of seeing Professor 

 Gilchrist's method of using waste lime on arable land in the 

 north of England. The material, known as ** Chance Mud,"" 

 or " Lime Mud," containing about 60-70 per cent, calcium car- 

 bonate and free from injurious constituents, is cheap, and while 

 not in dry powder condition is in such state that it can be spread 

 on the land from farm carts. It is put on the " Hay Stubble " at 

 the rate of 4 J tons per acre, then ploughed in. Oats are then 

 sown and after this crop is removed the land is ploughed for roots. 

 This ploughing of course brings the waste lime up to the surface 

 again when it dries and falls to a fine powder. The method is sound 

 because the oats stand in no need of lime and therefore suffer 

 no inconvenience from having the material buried; the roots 

 on the other hand require it, and therefore benefit from having 

 it brought up to the surface. 



Injury to Root Crops from use of Superphosphate. — In- 

 stances have come to the writer's notice from the north of 

 England of damage done to root crops by superphosphate this 

 season, presumably through encouraging finger-and-toe. It is 

 desirable to have the exact cause of the trouble determined if 

 possible, and farmers who have suffered are requested to com- 

 municate with the Rothamsted Experimental Station stating 

 whether finger-and-toe was common or not. 



Use of Gas Liquor as Substitute for Sulphate of Ammonia. — 

 A correspondent writes to say that he is offered gas liquor at a 

 cheap rate and asks if and how he can use it as fertiliser. The 

 direct use of this material is not to be recommended: the proper 

 course is for the gasworks to convert it into sulphate of 

 ammonia. If this is entirely ruled out, however, then the gas 

 liquor can be used provided: — 



1. Sulphides, sulphocyanides and cyanides are absent, or 



occur in traces only. 



2. Frequent determinations of the ammonia content are 



made. 



The liquor in question was of the so-called 12 oz. strength, i.e., 

 12 oz. of pure sulphuric acid were needed to neutralise 1 gallon. 

 This is about 10 times as strong as ordinary liquid manure 



