. Basic slags and rock phosphates . of the period from May 17thtill the crop was carted off the plots on August 21st, the surface three 1 Unfortunately the sample drawn from Plot 17 on August 31st met with anaccident. ON THE TEMPERATURE OF THE SOIL 69 Table XXXVI. Temperature op the Soil at HorndonON Plots 16 and 17, at Depths op 3 inches and 9 inches Temperature (degrees Centigrade) Date At a depth of 3 inchesPlot 17 Plot 16 At a depth of 9 inches Plot 17 Plot 16 1920 Basic slag Untreated Basic slag Untreated May 5 — — 9-8 10-3 10 — — — — 17 140 160 12-5 13-5 25 17-2 20-3 14-7 17-7 31 15-4 21
. Basic slags and rock phosphates . of the period from May 17thtill the crop was carted off the plots on August 21st, the surface three 1 Unfortunately the sample drawn from Plot 17 on August 31st met with anaccident. ON THE TEMPERATURE OF THE SOIL 69 Table XXXVI. Temperature op the Soil at HorndonON Plots 16 and 17, at Depths op 3 inches and 9 inches Temperature (degrees Centigrade) Date At a depth of 3 inchesPlot 17 Plot 16 At a depth of 9 inches Plot 17 Plot 16 1920 Basic slag Untreated Basic slag Untreated May 5 — — 9-8 10-3 10 — — — — 17 140 160 12-5 13-5 25 17-2 20-3 14-7 17-7 31 15-4 21-4 14-8 16-2 June 8 14-4 18-1 13-5 15-4 14 170 200 150 18-0 21 16-3 20-0 15-8 17-5 29 17-5 20-5 16-4 19-2 July 8 15-3 16-8 14-8 16-1 12 17-5 19-8 15-4 17-9 20 16-5 200 15-6 17-6 26 15-3 16-3 14-9 16-2 Aug. 4 14-6 17-6 14-6 16-2 9 15-2 17-4 14-9 16-6 16 15-5 19-2 15-0 16-8 21 130 13-8 — — 31 15-3 14-7 14-2 13-9 Sept. 7 15-8 15-5 15-3 14-8 20 12-2 12-5 12-6 12-7 Oct. 4 13-4 13-5 13-6 13-4 Nov. 24 4-5 4-2 5-2 50 o 23r. n 24 7 21 S t9 Z 16 30 /4- Z8 5May June July August Sept. Oct. Fig. 15. Temperature of the Soil at a Depth of 3 inches on the Untreated and BasicSlag Plots at Great Mulgraves, Horndon-on-the-Hill. Soil London 16, Untreated Plot 17, Basic 70 EFFECT OF PHOSPHATES zor
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