. Basic slags and rock phosphates . Fig. 7. Botanical composition of the Hay, by weight, at Martins , 1919. Soil Boulder clay. 1, Open hearth (fluorspar) basic slag. 2, Open hearth (high soluble) basic slag. 3, Untreated. 4, Gafsa rock phosphate. 5, Egyptian rock phosphate. 6, Algerian rock phosphate. 4—2 52 EFFECT OF PHOSPHATES disappeared, the improvement in the grasses has succeeded in reducingthe amount of weeds to about one-third of that present in the hayfrom the untreated plots. The main points of difference are illustratedin Figs. 7 and 8. 1-170 60 O W _ Ph Good GrossInfer
. Basic slags and rock phosphates . Fig. 7. Botanical composition of the Hay, by weight, at Martins , 1919. Soil Boulder clay. 1, Open hearth (fluorspar) basic slag. 2, Open hearth (high soluble) basic slag. 3, Untreated. 4, Gafsa rock phosphate. 5, Egyptian rock phosphate. 6, Algerian rock phosphate. 4—2 52 EFFECT OF PHOSPHATES disappeared, the improvement in the grasses has succeeded in reducingthe amount of weeds to about one-third of that present in the hayfrom the untreated plots. The main points of difference are illustratedin Figs. 7 and 8. 1-170 60 O W _ Ph Good GrossInferior GrassWeeds 1^^^/f1 mk> 50 40 30 20 -10. 1 r 0 Fig. 8. Botanical composition of the Hay, by weight, at Tysea , 1919. Soil Boulder clay. 1, Basic Bessemer slag. 2, Gafsa rock phosphate. 3, Untreated. 4, Openhearth (fluorspar) basic slag. 5, Open hearth (high soluble) basic slag Open hearth (high soluble) basic slag 2. Table XXIV. Peecentage of Ground space occupied by theVegetation at Tysea Hill and Martins Hearne Tysea Hill Maktins Heabne Plot 1 Plot 3Basic slag Untreated Plot 2Basic slag Plots Untreated Clovers Grasses Weeds Bare space 50-050-0 0-334-8 64-9 6-330-5 0-762-5 2019-2 1-976-9 1000 1000 100-0 100-0 The aftermath on both sets of plots was grazed by cattle, andduring the first week of October 1919 a determination of the groundspace occupied by the various species was made, and the results areset out in Table XXIV. The clover had not reappeared at either centre in spite of thefavourable chmatic conditions, and although the treated plots couldbe distinguished from the unmanured more than a mile away t
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