Fertilizers for Peach Orchards 157 



required ^ pound of phosphoric acid, 1 of potash, 1| of 

 lime, and ^ pound of magnesia. 



The work done by the New Jersey Station and reported 

 by Warren ^ was along lines similar to that of the New York 

 Station, but it was carried considerably farther in detail, 

 the object being to determine the entire amount of plant- 

 food removed by a tree in a ten-year period. 



The tree used was a Late Crawford planted as a one- 

 year-old in 1896. The plan required that the entire growth 

 of leaves, the prunings, and the fruit after it began bearing 

 be collected each year, weighed, and analyzed. After the 

 tenth season, the tree was dug up with its root system as 

 complete as possible, divided into parts, weighed and an- 

 alyzed as for the annual growth products of the tree. The 

 tree was separated into parts as follows : (1) The 1905 

 growth cut from the tips of all twigs; (2) the remaining 

 twigs up to one inch in diameter ; (3) remainder of the top 

 to the surface of the ground ; (4) roots larger than one inch 

 in diameter; (5) roots smaller than one inch in diameter. 

 A summary of the plant-food materials used during the 

 entire ten years' growth is given in Table VI. 



The data in the body of this table consist of the analyses 

 that were made of the different parts of the tree. There- 

 fore, they represent a very close approximation to accuracy 

 in representing the amount of plant-food that was actually 

 taken up by the tree and its products in ten years. The sec- 

 ond section of the table shows the relative quantities of plant- 

 food treating the nitrogen as unity. Thus in the total, 

 it appears that for every pound of nitrogen used, nearly 

 .3 (.27) of a pound of phosphoric acid and about .6 of potash 

 were needed, 



1 An. Rept. N. J. Sta. for 1906, pp. 192-203. 



