756 



Notes on Feeding Stuffs for November. 



[Nov., 









19 units 





Phos- 



Price per 



Price per 



per acre 



Cost per 



phate. 



% 



ton\. 



unit. 



in. J 



acre. 



s, d. 



s. d. 



cwt. 



s. d. 



88 . 



. 101 



... 2 8 



... 10 .. 



. 50 8 



22 .. 



. 62 6 



... 2 9 



.. lTA 



. 52 3 



70 .. 



. 125 



... 1 9 



... 5f .. 



. 33 3 



60 .. 



. 115 



... 1 11 



... 6i .. 



. 36 5 



30 .. 



95 



... 3 2 . 



.. 121 .. 



. 60 2 



ness. The following table has been drawn up by Professor 

 Gilchrist* : — 



Comparative Costs of some Phosphatic Manures in the 



Spring of 1922. 



Manure. 



Basic slag 

 Basic slag- 

 Ground American phosphate 

 Ground African phosphate 

 Superphosphate (soluble) 



Slags and mineral phosphates are both guaranteed to be 80 

 per cent, fineness (i.e., passing sieve with 100 meshes to the 

 linear inch). Satisfactory results have been obtained by Pro- 

 fessor Gilchrist with some of the mineral phosphates especially 

 when very finely ground (80 per cent, passing a sieve with 120 

 meshes to the linear inch). In one case the result appeared to 

 be as good as, if not better than, that produced by high grade 

 basic slag. With less fine grinding the results are less 

 satisfactorv. 



The question often arises whether lime is needed in addition 

 to basic slag. In many cases it is not, but the rule is by no 

 means absolute. Dr. J. A. Hanley has found soils in Yorkshire 

 which are so sour that basic slag does not act until lime is added, 

 but then a remarkable effect is produced. Probably other soils 

 of the same character could be found ; where basic slag has not 

 given the effect which might have been expected it is worth while 

 consulting the county organiser with the view of having the soil 

 examined. 



****** 



NOTES ON FEEDING STUFFS FOR 



NOVEMBER. 



E. T. Halnan, M.A., Dip. Agric. (Cantab.), 

 Ministry of Agriculture and Fisheries. 



The Use of Home-Grown Feeding Stuffs for Stock Feeding. 



— The prices of home-growm feeding stuffs, usually sold off 

 the farm, have now reached the stage when it becomes more 

 economical for the farmer to feed his grain crops to stock 

 rather than to sell them for human food and purchase cakes 



* Field experiments with Rock Phosphates and Basic Slag were described 

 in this Journal for September and October, 1022, and a further article appears 

 in this issue, p. 706. 



f Carriage paid to farmers' stations. 



| Containing nearly 2001b. phosphoric acid. 



