Artificial manures; their chemical selection and scientific application to agriculture . Tiuentyioheat grains loere sownin each case. Calcic phosphatePotassic nitrate Calcic phosphateSodic nitrate Potassic silicate Potassic silicate Straw and roots grains269 Straw and roots grains243 211 wheat grains 77 210 wheat grains 72 346 315 The conclusion to be drawn from these experiments is that asfar as wheat is concerned soda cannot replace potash ; sodic nitrate,therefore, when used in conjunction with calcic phosphate, is but apoor manure, but by the addition of potash we at once raise thevalue of
Artificial manures; their chemical selection and scientific application to agriculture . Tiuentyioheat grains loere sownin each case. Calcic phosphatePotassic nitrate Calcic phosphateSodic nitrate Potassic silicate Potassic silicate Straw and roots grains269 Straw and roots grains243 211 wheat grains 77 210 wheat grains 72 346 315 The conclusion to be drawn from these experiments is that asfar as wheat is concerned soda cannot replace potash ; sodic nitrate,therefore, when used in conjunction with calcic phosphate, is but apoor manure, but by the addition of potash we at once raise thevalue of the mixture as a fertilising agent. The above are average results. The following are the experi-ments from which these average results were deduced :— Calcic phosphatePotassic nitrate Calcic phosphateSodic nitrate Potassic silicate Potassic silicate I. Straw and roots grains274 I. Straw and roots grains236 215 wheat grains 83 220 wheat grains 69 357 305 11. II. Straw and roots207 wheat grains grains264 72 Straw and roots201 wheat grains grains 250 76 336 326 Humus. its. Straw and rootsSeeds . . 78 Grains . 81 4 85 APPENDIX ACTION OF CONSTITUENTS OF PLANT PRODUCTION. EXPEBIMENTAL CULTIVATION IN CALCINED SAND. STIMULATING Ma HUU08 I ACTIVE CULTIVATION. This of eiperi- glazed porcelain pota whichhad been previously soakedin melted wax in order toprotect plants from thesaline exudations whichfonn on ordinary clay these conditions thegrowth ia not bo active andthe yield is less; but the re-sults are more exact, betterdefined, and more fitted toelucidate the laws of vege-tation which are the safestguide upon which practice Man UK E. OALOIC CARBONATE. Manure Manu
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