1921.] 



The Claying of Fen Soils. 



417 



soil is acid, the small amount of lime in the clay will have 

 a beneficial effect, yet, generally sneaking, there is no deficiency 

 of lime in the top soil to make up. 



The potash supplied by the clay is a factor which must 

 be considered. In experiments on the manuring of blackland 



1 

 1 



I. 



I. 





11. 



II. 



11. 



I la. 



Mechanical. 



Top. 



Sub. 



Clay. 



Top. 



Sub. 



Clay. 1 



Clay. 



Fine Gravel 







•35 1 





1-9 



6-5 



Coarse Sand 







1-87 ' 





n-7 • 



10-0 



Fine Sand 







1 



18-37 1 







35-2 



16-0 



Coarse Silt 







25-50 ! 



1 







6-9 



6-0 



Fine JSilr 







9-8 







4-2 



17-3 



Clay 







19-6 







4-2 



30-9 



Loss on Ignition 



57 -30 



73-6 



12-9 



.50-3 



61-5 



3-8 



9.1 



Moisture ... ... 



11-0 



4^4 



• 



3-8 



9-0 



ir6 



. 



1-0 



3-16 



Chem'ical. 

















CaO 



5-8 



6-2 



3-2 



18-7 



12-4 



•3 



3^5 



MgO 



•31 



•02 



•34 



•36 



•15 



•05 



•63 



K.,0 



•44 



•44 



•75 



•65 



•48 



•11 



•71 



P.O, 



•19 



•10 



•22 



•24 



•11 



•14 



•10 



Iii>()lnble Iicsidues ... 



23-75 



16-80 



76 •.50 



25-5 



15^65 



91-95 





carried out between 1898 and 1907 by the Cambridge Univer- 

 sity Department of Agriculture, it was found that no benefit 

 was gained by the potato crop from the addition of sulphate of 

 potash to other artificial manures. This is borne out by 

 experience, for the almost universal dressing for potatoes 







