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Table 7 The ANOVA summary (a) significance level and (b) volume production per main treatment over three sites at age 9 years from the second and third rotation trials established in 1991

From: 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

Treatment

Site

A9

C9

D5

Mean

(a) Site significance level

 

Level of statistical significance of F-test

 

Second rotation (S2R)

 Site preparation

n.s.

**

*

***

 Fertiliser

*

n.s.

n.s.

***

 Interaction

n.s.

n.s.

n.s.

n.s.

Third rotation (S3R)

 Site preparation

***

***

***

***

 Fertiliser

***

n.s.

n.s.

**

 Interaction

***

n.s.

n.s.

n.s.

(b) Site volume production

 

Volume production (m3 ha−1)

Second rotation (S2R)

 Residue removed

178

179 b

113 b

155 b

 Control

209

237 a

143 ab

196 a

 Lime

224

231 a

157 a

204 a

 Standard error of mean

16.3

12.0

12.0

7.8

 LSD0.05 for site preparation

48.2

35.4

35.6

16.1

 No fertiliser

177 B

207 A

128 A

170 B

 Fertilised

230 A

224 A

149 A

200 A

 Standard error of mean

13.3

9.8

9.8

6.3

 LSD0.05 for site preparation

39.4

28.9

29.1

13.1

 Grand mean

204

215

138

185

Third rotation (S3R)

 Residue removed

176 b

130 c

108 b

138 b

 Control

221 a

244 a

155 a

207 a

 Lime

236 a

213 b

170 a

206 a

 Standard error of mean

5.3

10.3

7.1

5.7

 LSD0.05 for site preparation

15.6

30.4

21.0

13.1

 No fertiliser

195 B

191 A

139 A

175 B

 Fertilised

227 A

200 A

150 A

192 A

 Standard error of mean

4.3

8.4

5.8

4.6

 LSD0.05 for site preparation

12.8

24.8

17.1

10.7

 Grand mean

211

196

144

184

  1. Different letters indicate significant differences between the 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
  2. n.s. not significantly different
  3. * = 5% level, ** = 1% level, *** = 0.1% level