Table 2.  Overall effect of mulch and fertilizer application on oil palm growth.
Variable Treatment Mulch Overall average of
effect of fertilizer
None Palm Shell Empty
Fruit
Bunch		 Double
empty
Fruit
Bunch
P x S
No Fertilizer 3.7 3.93 3.85 3.85 3.83
Fertilizer 3.83 3.88 3.99 4.03 3.9 (3.91)
Overall Average of
Effect of Mulch 		3.76 3.9 3.92 3.94 3.87
Leaf area *
No Fertilizer 2.05 2.22 2.04 2.04 2.1
Fertilizer 2.09 2.08 2.03 2.12 2.07 (2.10)
Overall Average of
Effect of Mulch		 2.07 2.15 2.035 2.08 2.085
Leaf emission rate **
No Fertilizer 3.11 3.28 3.12 3.12 3.17
Fertilizer 3.32 3.32 3.24 3.35 3.29 (3.33)
Overall Average of
Effect of Mulch 		3.22 3.3 3.18 3.24 3.23

* Average of 120, 240 and 360 days after treatment application.
** Average of 240 and 360 days after treatment application.
( ) Overall average of effect of fertilizer when DEFB was tested.