The importance of harvest residue and fertiliser on productivity of Pinus patula across various sites in their first, second and third rotations, at Usutu Swaziland

New Zealand Journal of Forestry Science

Table 4 The ANOVA summary, (a) main treatment significance level and (b) volume production per main treatment across five sites over time for the first trial series established in 1971 on first and second rotation sites

Treatment	Age (years)
Treatment	4	6	10
(a) Site significance level
	Level of statistical significance of F-test
First rotation (F1R)
Site preparation	***	***	***
Fertiliser	***	***	***
Interaction	n.s.	n.s.	n.s.
Second rotation (F2R)
Site preparation	***	**	***
Fertiliser	***	***	***
Interaction	n.s.	n.s.	n.s.
(b) Site volume production
	Volume production (m³ ha⁻¹)
First rotation (F1R)
Residue removed	24 b	73 c	197 c
Control	27 b	80 b	216 b
Cultivated	33 a	92 a	225 a
LSD^0.05 site preparation	4.0	5.6	9
No fertiliser	25 B	74 B	198 B
Fertilised	32 A	89 A	226 A
Grand mean	28	81	212
Second rotation (F2R)
Residue removed	22 c	72 b	187 b
Control	27 b	83 a	215 a
Cultivated	32 a	87 a	222 a
LSD^0.05 site preparation	3.3	6.3	12
No fertiliser	23 B	73 B	195 B
Fertilised	31 A	88 A	224 A
Grand mean	27	81	208

Different letters indicate significant differences between the means at the 5% level within each rotation and age. Lowercase letters for site preparation and uppercase for fertiliser
n.s. not significantly different
* = 5% level, ** = 1% level, *** = 0.1% level