527 



Table 4. — Weight of Hay at Butcher's Farm, 

 Lambourne End. 



Manures sown : January 19tb, 1919. 



Plots 

 J acre 



Maxurc 

 juu io, 1- 2*^5 i)Gr acre 



Citric 

 solubilitj^ 



of the 

 phosphate, 



Hay (in cvvt. per acre) 

 1019 ' 1920 1921 ^^^^''^^^^ 







per cent. 









.i years 





f 'nni ViTK 1 no pnnroli tp*5 



25 



25-0 



32-3 



3 33 



30-2 



1 



Open hearth (fluorspar) 















basic slag 



20 



26-6 



34-7 



38-5 



33-3 



2 



Open hearth basic slag 



91 



24-5 



30-2 



31-0 



30-6 



3 



No manure ... 





13.2 



21-4 



18-4 



17-7 



4 



Egyptian phosphate 





18-0 



34-4 



27-4 



26-6 



5 



Florida pebble phosphate... 



18 



16-9 



37-8 



30-5 



28-4 



6 



Tunisian phosphate 





19-0 



38-1 



34-0 



30-3 



7* 



Open hearth (fluorspar) 















basic slag (Wigan) 



32 



16-0 



34-1 



29-4 



26-5 





Open hearth basic slag 















(Wigan) ... 



80 



23-7 



380 



28-5 



30-1 





Cleveland phosphate 



19 



19-9 



38-9 



34-4 



3M 





Rainfall. May 1st till harvest 















(in inches) 





3-08 



5-27 



2-44 







Date of cutting 





July 



July 













17 



17 









* Plots 7 and 









At Butcher'^ Farm the soil down to a depth of about 12 in. 

 was of a fibrous peaty character, and, although it rested on a 

 stiff London clay subsoil, the first 9 in. of soil resembled a sour 

 peat loam. Scarcely a trace of leguminous plants has been 

 visible on the untreated plot throughout, the hay consisting 

 largely of water grasses and the type of weeds characteristic of 

 sour soils. The soil had a high lime requirement (0.45 per 

 cent.). 



At this centre there have been no indications that high citric 

 solubility is of any particular advantage. The open hearth 

 fluorspar slag (Plot 1) which did so poorly at ]^Iartins Hearne 

 and Horndon (Tables 2 and 3) gave quite as good results as the 

 high soluble slag. The open hearth fluorspar slag used on 

 Plot 7, in spite of the fact that it is more soluble than the one 

 used on Plot 1, did not do so well. 



The three rock phosphates have proved quite satisfactory. 

 Florida Pebble which gave comparatively poor results at Horn- 

 don did much better on the sour soil at Butcher's Farm. The 

 results at this centre suggest that on sour pastures and meadows 

 there is little advantage to be gained from high citric solubility. 



