EXPERIMENTS 273 



Note the color of each, and the percentages of nitrogen and 

 humus obtained by chemical analysis. 



Experiment No. 30. 

 Summary of Results of Tests with Home Soil. 



Hydroscopic moisture as determined in Experiment No. i. 



Capacity of the loose soil to absorb water in Experiment No. 2. 



Height of rise of capillary water in tube in Experiment No. 4. 



Weight per cubic foot in Experiment No. 6. 



Prevailing kind of soil particles in Experiment No. 9. 



Reaction of soil in Experiment No. 14. 



Amount of acid soluble matter in Experiment No. 17. 



Amount of humus extractive material in Experiment No. 18. 



Amount of lime. 



Crops most suitable for production upon this soil as indicated by 

 physical and chemical tests. 



How does this agree with your experience with the crops raised 

 on the soil ? 



Probable deficiencies or weak points as indicated by tests or past 

 experience. 



What is the most suitable line of farming to follow with this soil 

 in order to conserve its fertility ? 



Scheme of Soil Classification. 



(Adapted from Bureau of Soils Report, U. S. Dept. Agr). 



Coarse sand contains more than 20 per cent, of coarse sand and 

 more than 50 per cent, of fine gravel, coarse sand, and medium 

 sand, less than 10 per cent, of very fine sand, less than 15 per cent, 

 of silt, less than 10 per cent of clay, and less than 20 per cent, of 

 silt and clay. 



Medium sand contains less than 10 per cent, of fine gravel, more 

 than 50 per cent, of coarse, medium, and fine sand, less than 10 

 per cent, of very fine sand, less than 15 per cent, of silt, less than 

 10 per cent, of clay, and less than 20 per cent, of silt and clay. 



Fine sand contains less than 10 per cent, of fine gravel and 

 coarse sand, more than 50 per cent, of fine and very fine sand, less 

 than 15 per cent, of silt, less than 10 per cent, of clay, and less 

 than 20 per cent, of silt and clay. 



Sandy loam contains more than 20 per cent, of fine gravel, coarse 

 sand and medium sand, more than r 2o per cent, and less than 35 



(18) 



