APPENDIX 417 



WYOMING 



There are no crop rotations in general use. In the older fanning districts 

 the farmers are generally adopting the rotation common in northern Colorado; 

 namely, alfalfa three years, potatoes, grain and seed down to alfalfa. This 

 rotation is probably unexcelled for the arid regions where potatoes are success- 

 fully raised as a general crop. At higher altitudes an excellent rotation is 

 field peas one or two years (to be fed lambs through the winter and not 

 harvested), followed by grain. Farming without irrigation consists in fallow 

 one year and grain or some other crop the next. Our soils are rich in mineral 

 foods and poor in nitrogen and humus, so any successful rotation must con- 

 tain a legume. 



Director, Wyoming Agr. Experiment Station. B. C. BUFFUM. 



II. ANALYSES OF SOILS 



The following analyses of a few representative soils illustrate the general 

 composition of farm soils. 



ANALYSIS OF ADOBE SOIL FROM SANTA FE, NEW MEXICO 



Per Cent. 



Silica 66.69 



Alumina 14.16 



Ferric oxide 4.38 



Manganese oxide 0.09 



Lime 2.49 



Magnesia 1.28 



Potash 1.21 



Soda . 0.57 



Carbonic acid 0.77 



Phosphoric acid 0.29 



Sulphuric anhydride 0.41 



Chlorine 0.34 



Water 4.94 



Organic matter 2.00 



ANALYSIS OF LOESS FROM DUBUQUE, IOWA 



Per Cent. 



Silica 72.68 



Alumina 12.03 



Iron sesquioxide 



Iron protoxide 



Titanum oxide 0.72 



Phosphoric anhvdride 0.23 



Manganese oxide 0.06 



Lime 1-59 



Magnesia . l-ll 



Sod! 1-63 



Potash 2.13 



Water . 2.50 



Carbon dioxide 



Sulphurous anhydride 0.51 



Carbon . 0.09 



