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 3 ANOVA summary of (a) significance level of five individual sites and (b) volume production per site main treatments at age 10 years, on the first and second rotations for the first (F) trial series established in 1971

Treatment	Site
Treatment	A9	B17	C9	D5	E2	Mean
(a) Significance level of sites
	Level of statistical significance of F-test
First rotation (F1R)
Site preparation	n.s.	*	n.s.	*	***	***
Fertiliser	n.s.	**	*	*	***	***
Interaction	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
Second rotation (F2R)
Site preparation	**	***	n.s.	***	**	***
Fertiliser	***	n.s.	***	***	***	***
Interaction	n.s.	n.s.	n.s.	n.s.	n.s.	n.s.
(b) Site volume production
	Volume production (m³ ha⁻¹)
First rotation (F1R)
Residue removed	220	186 b	237	177 b	166 c	197 c
Control	236	210 a	249	203 a	180 b	216 b
Cultivated	259	215 a	260	188 ab	203 a	225 a
LSD^0.05 site preparation	–	21	–	16	10	9
No fertiliser	222	191 B	237 B	181 B	161 B	198 B
Fertilised	254	216 A	260 A	197 A	205 A	226 A
Grand mean	238	204	249	189	183	212
Second rotation (F2R)
Residue removed	186 b	183 b	237	154 b	177 b	187 b
Control	237 a	221 a	239	182 a	195 a	215 a
Cultivated	237 a	227 a	251	193 a	205 a	222 a
LSD^0.05 site preparation	29	17	–	18	15	12
No fertiliser	193 B	204	227 B	158 B	178 B	195 B
Fertilised	247 A	217	257 A	194 A	206 A	224 A
Grand mean	220	210	242	176	192	208

Different letters indicate significant differences between means at the 5% level within each rotation. Means with no letters have no significant difference. Lowercase letters for site preparation and uppercase for fertiliser
n.s. not significantly different
* = 5% level, ** = 1% level, *** = 0.1% level