316 INDEX. 



PAGE 



Nile, how utilized 150 



mud of / 22, 24, 225-236 



rise of 151 



nitrate of soda 77,82,89,285289 



lime 293-294 



See also nitrogen. 



nitric compounds in air 10 



soil 03 



nitrification 03 



nitrous compounds in air 10 



soil 03 



nitrogen as plant food 27 



fixed by leguminous plants 44 



in air 7, 8 



humus 60 



manure 222, 239, 241, 245-257, 200-261 



in Nile mud 24, 228, 233, 235 



soil 24, 29-31 



nitrogen lime 293-295 



nodules of leguminous plant? 44, 65 



"norag" 138 



"noria" 170 



optimum temperature. See temperature. 



organic matter in farm-yard manure 242, 252 



Nile mud 24, 228 



soils 24, 31, 63, 220 



organisms in soil 58-68 



roots 05 



osmosis 69-71 



oxidation 9, 01, 89 



oxygen as weathering agent 21, 



in air 7, 8 



Panicum 208 



permeable. See porosity. 



pervious. See porosity. 



phosphate as plant food 27 



fixation of 34-30 



in manure 222, 239, 241, 245, 257, 261, 295-304 



in Nile mud 24, 228, 233 



in soil 24, 29-31 



phosphoric acid. Se-e phosphate. 



phosphorous. See phosphate. 



pigeons, manure of 256-257 



plants in relation to soil . - 08-74 



