. Basic slags and rock phosphates . ilthe end of February, 1917. The results for 1917, 1918, 1919 and 1920are given in Table XII. 28 THE ESSEX EXPERIMENTS Table XII. Weight of Hay at Farnham HallManures sown: February 22nd, 1917 Plots Manube200 lbs. P2O5 per acre CitricsolubiUtyof phos-phate (%) Hay (in cwts. per acre) 1917 1918 1919 1920 1 2 3 4 Open hearth (fluorspar) basic slagOpen hearth (high soluble) basic slagUntreated ...Gaf sa rock phosphate 20191-238-0 26-8 28-224-2 25-7 6-3 6-04-96-6 7-2 7-07-98-6 9-8 11-5111111 Rainfall, May 1st till harvest (in inches)Plots cut = 3-86June 23 2-97J
. Basic slags and rock phosphates . ilthe end of February, 1917. The results for 1917, 1918, 1919 and 1920are given in Table XII. 28 THE ESSEX EXPERIMENTS Table XII. Weight of Hay at Farnham HallManures sown: February 22nd, 1917 Plots Manube200 lbs. P2O5 per acre CitricsolubiUtyof phos-phate (%) Hay (in cwts. per acre) 1917 1918 1919 1920 1 2 3 4 Open hearth (fluorspar) basic slagOpen hearth (high soluble) basic slagUntreated ...Gaf sa rock phosphate 20191-238-0 26-8 28-224-2 25-7 6-3 6-04-96-6 7-2 7-07-98-6 9-8 11-5111111 Rainfall, May 1st till harvest (in inches)Plots cut = 3-86June 23 2-97June 29 1-73June 26 2-64June 30 Table XIII. Percentage of GROinsrD Space occupied by theVegetation on the Plots at Farnham Hall: August, 1919 Farnham (Boulder Clay Soil) Type ofvegetation Plotl Open hearth basic slag (solubility, 20%) Plot 2 High citric soluble basic slag (solubihty,91%) Plot 3 Nomanure Plot 4Gaf sa rockphosphate CloversGrasses ...WeedsBare space 27-1 %45-016-011-9 50-2 %33-313-530 16-2 %18-425040-4 35-9%45-510-68-0. 60 50 40 30 20 Ah tn 3O S-i Fig. , Open Percentage of Ground Space occupied by the Vegetation at Farnham, August, 1919. Soil Boulder clay,hearth (fluorspar) basic slag. 2, Open hearth high soluble basic slag. 3, Untreated. 4, Gafsa rock phosphate. THE ESSEX EXPERIMENTS 29 In spite of the fact that the amount of available phosphoric acidin this soil is very low, the response to the various phosphates, judgedby the yield of hay, is insignificant. The improvement in the threetreated plots was, however, obvious on walking over them. The cloverbottom on the untreated plot was very patchy and a considerablearea of the plot was bare. Plots 1, 2 and 4 were covered with a thickbottom of wild white and red clover. In the earher years of theexperiment Plot 2 had undoubtedly the better bottom, but wasclosely followed by Plot 4, which in 1920 was probably shghtly thebetter plot. Plot 1—open hearth fluorspar slag—^was inferior toPlot 2 during the first thr
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