Fertilisers and Manures

acre action agricultural ammonium salts amount of nitrogen analysis applied average bacteria barley basic slag bone meal bushels calcium carbonate calcium phosphate carbonate of lime cent citric acid clay clover composition compounds constituents containing coprolites cwts deposits dung effect example excreted farm farmer farmyard manure fertilisers field fish guano grain grass land grown growth guano gypsum humus increased insoluble kainit lime magnesia mangolds material meat guano mixture nitrate of soda nitrification nitrogenous manure obtained phosphate of lime phosphatic manures phosphoric acid plant food plots receiving ploughed potash salts potassium Potatoes produced proportion quantities rape cake residues root crops rotation Rothamsted experiments samples season seed shoddy sodium soil soil water soluble solution sowing sown steamed bone flour straw substances sulphate of ammonia sulphate of potash superphosphate Swedes TABLE tons tri-calcium phosphate turnips unmanured plot wheat yield