Mineral Nutrients 



155 



land. In general, for the crops included, the losses of 

 nitrogen and potash are fairly comparable, while the loss 

 of phosphorus is only about one fourth as great as either 

 of the other constituents. Frequently, however, much 

 of the potash-containing products, such as straw and 

 stover, are returned to the land. 



84. Nutrients removed by fruit crops. - The following 

 table indicates the amounts of nitrogen, phosphoric acid, 

 potash, and lime removed by various fruits, the quantities 

 being determined for the fresh fruit per thousand pounds, 

 assuming that leaves, wood, etc., of the trees will be 

 eventually returned to the soil : - 



QUANTITIES OF SOIL INGREDIENTS WITHDRAWN BY VARIOUS FRUITS l 



1 Data taken from Wickson, E. J., "California Fruits,' 



2 Including hulls. 



p. 157, 1900. 



