CONCLUSIONS 



353 



The balance sheet may be constructed as follows: 



The Nitrogen-Phosphorus Balance Sheet 



This system of farming tends towards soil enrichment and 

 the increasing of soil fertility. The crops grown also indicate 

 this tendency. 



The potassium balance sheet may be worked out in a similar 

 manner as that for phosphorus. 



Conclusions. Good farming may be either stock farming or 

 grain farming. It is possible to increase and maintain soil fertility 

 under either system. The crop yields and the nitrogen-phosphorus 

 balance sheet in any rational system of farming may indicate 

 whether the system tends towards soil depletion or soil enrichment. 



Fertility Surveys. Make surveys of a number of farms of the region 

 including farms of different types. Obtain data to calculate the amounts of 

 plant-food elements removed by the chief crops and also the amounts returned 

 in green manure, barnyard manure, etc. Make comparative studies of these data 

 and determine what types of farming are best for maintaining the soil fertility. 



Home Projects in maintaining the soil fertility with any of the permanent 

 lines of farming may be started. 



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