678 



manures and manuring, you will imcl out how much the crop has 

 taken from the soil of nitrogen, potash and phosphoric acid. 

 Deduct that from the different amounts in the manure used, the 

 condition will give you the condition of your soil for the next crop, 

 and so on from year to year. 



It must be remembered that ammonical salts or nitrates cannot 

 be reckoned beyond one year, but if leguminous crops have been 

 sown, they enrich the soil in nitrogen. 



