LABORATORY PRACTICE 32$ 



Experiment No. 30 



Influence of Continuous Cultivation and Crop Rotation upon the 



Properties of Soils 



For this experiment a soil that has been under continuous culti- 

 vation, and also one of similar character from an adjoining field 

 where the crops have been rotated and farm manures have been 

 applied, should be used. Make the following determinations with 

 each soil : 



Weight per cubic foot. 



Capacity to hold water. 



Note the color of each. 



Experiment No. 31 

 Summary of Results of Tests with Home Soil 



Make a tabulation of your results including : 



Hydroscopic moisture as determined in Experiment No. I. 



Volatile matter as determined in Experiment No. I. 



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



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



Weight per cubic foot, Experiment No. 6. 



Prevailing kind of soil particles, Experiment No. 9. 



Deportment of soil when wet and kneaded, Experiment No. n. 



Reaction of soil, Experiment No. 16. 



Amount of acid soluble matter, Experiment No. 19. 



Amount of lime, Experiment No. 19. 



Amount of humus extractive material, Experiment No. 20. 



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? 



