. Basic slags and rock phosphates . ination one is forced to concludethat the various dressings of basic slag have never sufficed to meetthe need for phosphates, and that at Cockle Park the level of produc-tion could be still further raised by increasing the dressing of phos-phoric acid or by repeating the present standard dressing at morefrequent intervals. With the object of obtaining more precise information on this LIME REQUIREMENT OF THE SOIL 103 point, the total phosphoric acid in the soils from Plots 4, 6 and 8was determined with the following results: Plot 4 1919 •088 % P2O5•052•076 Pl
. Basic slags and rock phosphates . ination one is forced to concludethat the various dressings of basic slag have never sufficed to meetthe need for phosphates, and that at Cockle Park the level of produc-tion could be still further raised by increasing the dressing of phos-phoric acid or by repeating the present standard dressing at morefrequent intervals. With the object of obtaining more precise information on this LIME REQUIREMENT OF THE SOIL 103 point, the total phosphoric acid in the soils from Plots 4, 6 and 8was determined with the following results: Plot 4 1919 •088 % P2O5•052•076 Plot 6 untreated at the beginning of the experiment contained•071 % of phosphoric acid. Plots 4 and 8 have each received 800 phosphoric acid during the period of the experiment, sufficient,were there no losses, to raise the soil content of phosphoric acid to•107 %. Although the soil samples were removed less than two yearsafter the previous dressing of basic slag had been suppUed, it will 200 180 /60100 80604020 O .g. —K 4- 5 Year Tho. 27. Live Weight Gains on Basic Slag and Untreated Plots at Cockle Period, 1897-1905. Basic Slag Plot (3) . Untreated Plot (6) . be noted that the content of phosphoric acid in the soil on Plot 8is httle better than at the beginning of the experiment, and that thereserve of phosphoric acid in the soil from Plot 4 is much less thanmight have been anticipated. If the suggestion that phosphoric acidis still the Hmiting factor is correct, it would be natural to expectPlot 4 to give superior results to Plot 8. This is in fact the case(i3),and the inferiority of this latter plot over Plot 5 is not due to thedepressing effect of hme on the hve weight gain, but to the fact thatthe soil on this particular plot contains a smaller supply of phosphoricacid than on Plot 4. If the increase in hve weight gain from Plot 3* over Plot 6. at CocklePark during the period of the experiment is plotted out as is done in* Receives 200 lbs. of
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