INDEX. 



Home mixtures 42 



Humus (organic matter) 57 



Insolubility, desirable 31 



Irrigation, relation to fertilizers 60 



Lower grade fertilizers, example 40 



Manure, green 54 



Manure, stable 53 



Manure, fertilizing value B4 



Most economical form 88 



Nitrification 21 



Nitrogen, cost of 37 



Nitrogen, effect of 47 



Nitrogen, from air 21 



Nitrogen, sources of 19 



Nitrogen from organic sources 22 



Nitrogen cycle 20 



Nitrate of soda and carbonates 22 



Orange culls 64 



Organic matter (humus) 57 



Peas, green manure 54 



Phosphate guanos 26 



Phosphoric acid, cheapest form 26 



Phosphoric acid, cost of 37 



Phosphoric acid, effect of 48 



Phosphoric acid, sources of 23 



Plants, general 5 



Plant food, amount necessary 63 



Plant food 11 



Plant food "essential" 17 



Plant food, air derived II 



Plant food, soil derived 11 



Plant food, definition 17 



Potash, effect of 48 



