PLANTING AND CARE OF THE ORCHARD. 49 



free in the soil is sufficient to take care of this growth of wood. 

 Th-e leaves are returned to the soil and hence the material in 

 them does not have to be supplied to the soil. Therefore, if we 

 supply enough plant food to put back that taken away from the 

 land in the crop, we will keep our land in good condition. There 

 is nothing exact about such statements, as they may vary as 

 much as different soils do from one another. The following 

 table shows approximately the amount of plant food materials 

 r-emoved in one year from the soil of an acre of land fully 

 stocked with thrifty trees. This includes the amount contained 

 in the new wood, foliage and fruit: 



PLANT FOOD REMOVED FROM THE SOIL BY ONE ACRE IN 



ORCHARD. 



Phos. Acid Potash 



lbs. lbs. 



14 55 



18 72 



7 33 



8.5 38 



The following table shows the amount of nitrogen, phos- 

 phoric acid and potash found in a good crop of fruit grown ( n 

 one acre: 

 PLANT FOOD OF MANURIAL VALUE REMOVED FROM THE 



LAND BY VARIOUS FRUIT CROPS. 

 Fruit Pounds Nitrogen Phos. Acid Potash 



lbs. lbs. 



2.25 11.25 



1 12 

 3.6 14.4 



2 9 

 3.6 17.2 



4.3 12 



2.4 11 

 2 9.2 

 4.8 12 

 2.8 .8 

 4.2 18 



This manurial value may be applied to the land in many 

 forms. Maynard gives the following formulas: 



