The Elementary Principles of Scientific Agriculture |
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absorbed abundant agriculture ammonia animals APPLETON atmosphere bodies bone phosphate bones burning calcium carbonate Calcium oxide calcium sulphate called carbon dioxide caustic cent CHAPTER chemical chemist chemistry chlorine clay clover combination combustion composition compounds constituents contains corn cotton cotton-seed crops cultivation decay decomposition deficient earth elements escape excrements farm farmer and planter flame gases gives growth of plants guano gypsum heat hydrochloric acid hydrogen Illustrations important improvement of soils inorganic iron kind land light lime liquid Magnesium Magnesium oxide manganese manganese dioxide manure marl mentioned metal mixed moisture necessary nitrate nitrogen organic matter oxygen phosphate phosphoric acid phosphorus piece plant-food plow portion potash Potassium oxide pounds principles produce properties quantity require rock roots rotation salts sand seed silica silicon sodium solid starch sub-soil substances sugar sulphuric acid superphosphate supply surface tion valuable vegetable wheat wineglass