236 INDEX 



PAGE 



Most important and effective element o£ plant food, 



Nitrate is the 6 



Natural plant food, Sources of 33 



Nitrate in the vegetable garden. How to use 215. 



Nitrate of lime 125, 127 



Nitrogen found profitable for different crops, Amount of 223 

 Nitrogen from various sources. Twenty years' work on 



the availability of 171 



Nitrogen in agriculture, our leading industry. The 



position of 81 



Nitrogen, Percentage in nitrate of soda 7 



Nitrogen recovered in crops. Percentage of 180 



Nitrogen withdrawn per acre by an average crop, Num- 

 ber of pounds of 161 



Nitrogenous fertilizer materials, Investigation relative 



to use of 165 



Number of plants to the acre. To find the 209 



Number of pounds of nitrogen withdrawn per acre by 



an average crop 161 



Number of pounds of phosphoric acid withdrawn per 



acre by an average crop 161 



Number of pounds of potash withdrawn per acre by an 



average crop 161 



Number of years seeds retain their vitality 194 



Oats 105 



Oats, Formula for 107 



Oats, Instructions for using nitrate of soda on 107 



Occurrence of nitrate of soda 7 



Oil in seeds. Amount of 208 



Orange groves in Florida Ill 



Oranges, Experiments at Corona, California on 113 



Orchard, Establishing the apple 135 



Orcharding, Productive 152 



Percentage of nitrogen in nitrate of soda 7 



Percentage of nitrogen recovered in crops 180 



Philosophical facts 197 



Phosphate rock, Where found 6 



Phosphates 16 



Phosphatic fertilizers. How to apply 22 



Phosphoric acid found profitable for different crops. 



Amount of 223 



Phosphoric acid in superphosphate or acid phosphate. 



Soluble content of 6 



Phosphoric acid withdrawn per acre by an average 



crop, Number of pounds of 161 



