298 



CITRUS FRUITS AND THEIR CULTURE. 



soil, all except phosphorus, potash, nitrogen and some- 

 times lime, are usually present in sufficient quantities for 

 the needs of the trees. In some soils, even these four may 

 be present in the virgin soil in sufficient quantities to 

 last some time, but they become exhausted after a few 

 years cropping. 



The following analyses show the amounts of the 

 three more important fertilizer ingredients removed in 

 the fruit of pomelos, mandarin oranges and kumquats in 

 Florida, as determined by Professors Miller and Blair, 

 of the Department of Chemistry of the University of 

 Florida, and of sweet oranges and Eureka lemon as com- 

 puted from the data given by Mr. Hubert L. Dyer in Bul- 

 letin 93, University of California, Agricultural Experi- 

 ment Station: 



FERTILIZER ANALYSES OF THE FRUIT OF SIX VARIETIES 

 OF POMELOS. 



[From Bui. 58, Fla. Exp. Station.] 



