INDEX. 



(N.B. Names of farms have not, as a rule, been included in this Index). 



Achter Cogmans Kloof, F.C., 115, 116, 120. 



Achter Hex River, F.C., 147, 151, 152. 



Acid, Carbonic, as a plant food solvent in the soil 5. 



Citric, 2, 9, 10, 12, 13, 155. 



Acid excretions from roots, 2. 

 Acid, Humic, as a plant food solvent in the soil, 5. 



Hydrochloric, as a plant food solvent, 2, 9, 10, 12, 13. 

 Acidity of soil (see also "sour veld ") 23, 42, 92, 116, 118, 133, 154. 

 and liming, 64, 92. 

 ,, ,, retards nitrification, 23. 

 Agricultural chemical methods, 5. 



,, Experiment Station, Minnesota, 9. 



Robertson, 115, 153, 155, 184, 185, 199, 200. 



methods at the Cape, different from those of northern hemisphere, 5. 



Air, source of plant food, 1. 



Albany Division, 4, 20, 21, 23, 64, 154, 155, 167. 

 Albert Division, 20, 21, 24, 25, 52, 63, 121, 128, 155, 169, 171. 

 Aliwal North Division, 20, 21, 24, 25, 52, 63, 155, 169. 

 Alkali, Injurious proportions of, Prof. Hilgard's estimations, 179, 181, 182. 



,, Amount of, at soil surface kept low by cultivation, 179. 

 Alkaline efflorescence, 183. 



soil, 34, 35, 93, 110, 116, 117, 128, 142, 146, 150, 153, 172. 

 at Thebus, Steynsburg Division, 173, 180-184. 

 collection of, for analysis, 173, 182, 186. 

 at Thebus, 173. 

 ,,VanWyk'sVlei, 186. 



need of sampling complete soil profile, 182. 



distribution of salts in, 174, 182. 

 effect of irrigation on, 172, 179, 180, 187. 

 evil minimised by gypsum, 181. 

 irregular salt distribution in, 182. 

 in Britstown Division, 177-179. 

 ., Carnarvon ,, 185-187. 

 Robertson 116, 184, 185, 201. 

 California, 174. 

 India, 174. 



Magnesium salts in, 182. 

 methods of analysis described, 175. 

 ,, need for draining, 174. 



,, proportions of salts that cause barrenness, 174. 

 results of analyses of, 176, 178, 180, 185, 187. 

 water, analyses of, 183, 186. 

 Amazamyama plantation, 95. 



Analyses and practical agriculture, instances of concordant results, 6, 11, 13, 17, 28 

 50, 53, 55, 66, 72, 82, 85, 86, 105, 117, 133, 135, 141, 148, 149, 150, 155, 181 

 Analysis of soil, chemical, value of, 2, 5, 11, 18. 



., methods of, 2, 5, 13-17, 175. 



different kinds of, 8, 9, 11, 59, 172. 

 pounding may give misleading results, 13. 

 prejudice against, 11. 



