. Basic slags and rock phosphates . reated ; 8-7 81-4 9-9 8 Gafsa phosphate 63-8 320 4-2 9 Tunisian „ 47-7 49-2 31 11 Egyptian „ 49-3 47-7 30 13 Superphosphate 340 61-4 4-6 15 Superphosphate and Ume 51-4 47-9 0-7 16 Untreated ... 7-6 85-5 6-9 17 Open hearth basic slag (high citric soluble) 441 53-4 0-5 18 Open hearth (fluorspar) basic slag (low citric soluble) 45-5 53-2 1-3 H Cleveland phosphate 58-9 38-5 2-6 K Untreated 8-0 80-1 11-9 Horndon (London clay). These plots were grazed during 1919,and samples of hay for botanical analysis were not removed untilthe 1920 crop was cut on August 16th.
. Basic slags and rock phosphates . reated ; 8-7 81-4 9-9 8 Gafsa phosphate 63-8 320 4-2 9 Tunisian „ 47-7 49-2 31 11 Egyptian „ 49-3 47-7 30 13 Superphosphate 340 61-4 4-6 15 Superphosphate and Ume 51-4 47-9 0-7 16 Untreated ... 7-6 85-5 6-9 17 Open hearth basic slag (high citric soluble) 441 53-4 0-5 18 Open hearth (fluorspar) basic slag (low citric soluble) 45-5 53-2 1-3 H Cleveland phosphate 58-9 38-5 2-6 K Untreated 8-0 80-1 11-9 Horndon (London clay). These plots were grazed during 1919,and samples of hay for botanical analysis were not removed untilthe 1920 crop was cut on August 16th. The results which are set outin Table XXXI, and iQustrated in Fig. 11, show an extraordinarycontrast between the treated and untreated plots. In view of theeffect of grazing during 1919 on the growth of the herbage on theplots receiving phosphates (see Table XV and Plates VI and VII),it is, however, not surprising to find that clover was the dominantconstituent of the hay crop in 1920. ON BOTANICAL COMPOSITION OF HERBAGE 59 TOO. B, Cambridge coprolites. C, Lime. 3, Algerian phosphate, 5. Open hearth (highsoluble) basic slag. 6, Untreated. 8, Gafsa phosphate. 9, Tunisian phosphate. o a 90807060H5040302010 I 13 L §15 I ^ 16 ^HL [ ^18 L H ^ 11, Egyptian phosphate. 13, Superphosphate. 16, Super phosphate and lime. 16, Un-treated. 17, Open hearth (high soluble) basic slag. 18, Open hearth (fluorspar)basic slag. H, Cleveland phosphate. K, Untreated. Fig. 11. Botanical composition of the Hay, by weight, at Great Mulgraves,Horndon-on-the-HiU. Season, 1920. Soil London clay. DISCUSSION OF THE RESULTS OF THEBOTANICAL ANALYSIS Although a rapid and large increase in the amount of cloverspresent in the herbage has followed the application of phosphatesat the various experimental centres, and although the various phos-phates appear to be equally effective in this respect, there are clearindications that the effect of the phosphates on the herbage is notconfined to the clovers alone. At
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