CONTENTS
 Page

INTRODUCTION .. ......- ....-...---.. ....... --------------- .. -.. 3
METHODS AND MATERIALS .. ...... ... ........- ... ------------ ------- 4
 Selection of Groves ... ..........- ....... -- ------------------- 4
 CollecLion and Preparation of Samples ......-.....----- ---- .....- --- 5
 M methods of A analysis .. .......... ............... .... ----
 Mineral Composition of Leaves and Fruits ........---------- -.-.. 6
 Soil A naly is .. ...... .... .... ......--- .............--- 7
 Fruit Qualities .......... ....... .......--..--------- 7
RESULTS .................. ----------....... 8
 Field Data .............. ..... ........-- -------- 8
 Soil Type ....... .......... ....... .... ... ...... ------- 8
 Age .... .............. ...----------- -- ------ 9
 Planting Distance ... ..... ........-.... --------- -e--- 9
 Fruit Production .... .... ................--- -- --- -------- 11
 Fertilization Practices .... --..... ---------------- 11
 Spray and Dust Programs ........ ... ------------.- --- 15
 Irrigation -. ............ ... ......-- -------- 15
 Laboratory Data ... ..... .. .- ---------------- -- 16
 External Fruit Quality ...... ............ .. ...--- ------ .. 16
 Internal Fruit Quality ... ..... .... ..... ------------ 17
 Mineral Composition of Leaves .... .. ....... ...---- -------- --..-- 19
 Mineral Composition of Fruit ...... -.. ......------- --..- 19
 Mineral Composition of Soil .. ..- .... -.......-. -- -------------- 20
 DISCUSSION ..... ....... ..........-..... ...- ..... ..- --------- 20
 Influence of Planting Distance ................... ... .... -- ------------- 22
 Influence of Fertilization Practices ... -......---. ----------------------- 24
 Fruit Production .- -.. .- ... ....... -- -----------------24
 Fruit Qualities .................----.. .------ 25
 Leaf, Fruit, and Soil Composition ...... ------------------ -- --..-. 27
 Influence of Soil Reaction ... ...... .......--- -------- 29
 Influence of Copper in Soil ...... ...... -----------. ---- ...... 31
 Influence of Spray and Dust Program ...........-.......----- ..- 32
 Influence of Irrigation ....... ...............- .... -.-.... ...- ------ ---- 33
 Relation of Mineral Composition of Fruit and Leaf to Fruit Quality.... 36
 Relation Between Mineral Compositions of Leaf and Fruit ...........-.... 38
 The Roles of Leaf, Fruit and Soil Analysis in Studying the
 Mineral Nutrition of Citrus ...............- .. ----.------... 40
 SUMMARY AND CONCLUSIONS ........ -...--- ......--- ---. ....- ..... -------.. 41
 LITERATURE CITED -..... ....... ... ...... ---------- ------------------ .. 43
 A PPEN DIX .......... .... --- -...- -. ...- ...-...... .... ..- -- ...- 45



 ACKNOWLEDGMENTS

 1. This study was financed in part by a grant from the International
 Minerals and Chemical Corporation of Chicago, Illinois.
 2. The authors wish to express their appreciation to the many pro-
 duction managers and independent growers for their generous cooperation
 in supplying groves and records which made this study possible.