310 Mineral Nutrition of Plants 



at the end of the year that aeration became a problem and production 

 was depressed. Experiments on cultivation clearly illustrated that proper 

 methods of cultivation often mean the difference between success and 

 failure in producing the crop. 



SUMMARY 



An effort has been made to point out the tremendous number of 

 applications possible in field culture of the theory and practices of 

 nutrition developed by the various branches of agricultural science. 

 Many problems have been investigated and solved for practical con- 

 ditions. A large number of problems in nutrition under field condi- 

 tions remain unsolved. Undoubtedly, as new information regarding 

 the availability of plant nutrients found in minerals and humus is 

 supplied and as the different requirements of various plants are un- 

 covered, many of these problems will be readily solved with a mini- 

 mum of expense to the farmer and to industry. 



