CONTENTS
 Page
SCOPE OF THE EXPERIMENT....-.............---------- ----- --------..----.. .-- ---... 7
PLAN OF EXPERIMENT-.......................--.. ----.--------- -----------...... ----.---. 9
PRECIPITATION .......... ....... .....------------------ ---- -------- 11
CROP CONDITIONS IN EXPERIMENTAL ORCHARD......... ..------.....------- 11
CULTIVATION OF EXPERIMENTAL AREA.....-...--.--- ................ 13
FERTILIZERS ................ .......... --.......-- 16
GREEN MANURE .................... -.......--- -- --- -------------.------- -- --------- 16
EFFECTS OF COVER CROPS ON GROWTH AND YIELD OF PECAN TREES ............... 19
 Grow th..-............................- .... -- .... 19
 Yields .......... ..-- ... ......... ... ..... ........---..- ------ --.- ..... 20
NUT SIZES AND KERNEL PERCENTAGES -....--............. -------. -- 26
 Frotscher ......................... .............................. .... ... 27
 Stuart....................... ... ..... ..... ...- ..... .. ....27
EFFECTS OF COVER CROPS ON ORCHARD RETURNS .....--..-...- ....- .......... 30
EFFECTS OF COVER CROPS ON THE SOIL -.............. ........ --------------32
 Tube Samples--..... --....-..--.- ----------. -----------. 32
 Soil Reaction.......... ..-....- -------- -------34
 Nitrogen ............------------- -- --- ---------------.... -- ------------. 34
 Organic Matter ................ ------- -- ---------36
 Volume Samples ........----- -------- -- -------------......- ---... ----------- 37
 Nitrogen...............----.-........--. ....- --.- --------------. 37
 Organic Matter ..............-..--..-..-.. --- ---- ------------ 37
 Sudan Grass Growth ...-.. ---.......----------..... 37
DISCUSSION AND RECOMMENDATIONS ............. .. -----... --- 38
SUM M ARY .............. ... ... .- ..... ........... -- --- ----... 43
LITERATURE CITED ...... .. .............. ........-. -- ..--. ....... 44