Show nitrogen in apples A pound crop of apples from a vigorous tree 25 years old removes about one third of a pound of nitrogen from the soil for growth of its wood bark and roots such a tree uses about a half pound of nitrogen the leaves used from a half pound to a pound of nitrogen in their growth and development but this is restored to the tree and soil and is not ultimately removed from the orchard if loss of nitrogen by leaching can be prevented a pound of actual nitrogen rogen a year for a tree in full bearing is an ample supply too much nitrogen checks the desirable coloring of the fruit about 6 pounds of nitrate of soda or 5 pounds of sulphate of ammonia would supply a pound of nitrogen |