232 Index. 



Nitrogen in wheat straw, 163 

 loss of, 40, 73, 201 

 of the soil, 34, 39, 44, 52, 101, 107, 113. 116, 124, 153, 184 



194 



organic, 38, 40, 59 



recovered, and not recovered, in crops, 201. 203, 205 

 source of, 37, 41, 152, 180 

 Nitrogenous condition of soil, 96 



manures, 14, 17, 98, 100, 150, 179, 189, 223 



OAT grass (see Avena) 

 Oats, 108 

 Ononis, 221 

 Orchidacese, 220 

 Organic matter, 50, 97, 139 

 nitrogen, 38, 40, 59 



PERENNIAL grasses, 223 

 Peruvian guano, 13, 16 

 Phleurn pratense, 137, 220, 221 

 Phosphoric acid in barley crop, 89, 142, 188 



in drainage waters, 158 



in hay crop, 142, 147, 153, 155, 157, 163, 166 170 

 171, 173, 181, 183, 192, 205 



in soil, 43, 53, 59, 60, 126 



iii wheat crop, 37, 89, 142, 188 



recovered, and not recovered, in crops, 203 

 Physiological characters of plants, 224 

 Pirnpinella Saxifraga, 138 

 Plantaginese, 220 

 Plantago laiiceolata, 138 

 Plantain (see Plantago) 

 Poa, 220 



Poa pratensis, 137, 161, 163, 169, 174, 177 180 *n 004 

 Poa tririalis, 137, 163, 169, 170, 183, 191, 192, 204 Q21 224 

 Polygouacege, 220 



Population of United Kingdom, 79 

 Potash in barley crop, 89, 142 

 in drainage waters, 158 



in soil, 43, 53, 59, 60, 126, 129 



