. Basic slags and rock phosphates . 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. 7 21 June S /9 July /6 30 /3 27 4 August Sept. Oct. Fig. 16. Temperature of the Soil at a Depth of 9 inches on the Untreated and Basic Slag Plots at Great Mulgraves, Horndon-on-the-Hill. Soil London clay. Plot 16, Untreated Plot 17, Basic Slag . inches of soil on the slag plot remained
. Basic slags and rock phosphates . 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. 7 21 June S /9 July /6 30 /3 27 4 August Sept. Oct. Fig. 16. Temperature of the Soil at a Depth of 9 inches on the Untreated and Basic Slag Plots at Great Mulgraves, Horndon-on-the-Hill. Soil London clay. Plot 16, Untreated Plot 17, Basic Slag . inches of soil on the slag plot remained considerably cooler than thesurface soil on the untreated plot. The importance of securing anefficient covering of the surface soil, so as to protect it from the directrays of the sun, is well brought out in Fig. 15. The thick bottom ofclover has not only succeeded in retaining the moisture on Plot 17,but it has very effectively kept the plot cool during the hot spellof weather in May and June. A comparison of Figs. 13 and 15 showsquite clearly moreover that the lower temperature of the surfacesoil on Plot 17 is not due to the higher moisture which it contains,but is almost entirely due to the superior covering effect of the cropon this plot. During the hot period May 17th-25th the temperature of the su
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Keywords: ., bookcentury1900, bookdecade1920, bookidbasicslagsro, bookyear1922
