International Journal of Forestry Research

Research Article

Postplanting Nutritional Augmentation of Jeffrey Pine Seedlings on an Infertile Sierran Site

Table 2

Initial dimensions and effects of conventional, controlled release, and organic fertilizer formulations on relative growth of Jeffrey pine seedlings.^a

Formulation and application rate

Height

Diameter

Volume

Relative growth^b

Initial (cm)

Seasons 0–2

Seasons 2–4

Seasons 0–4

Initial (mm)

Seasons 0–2

Seasons 2–4

Seasons 0–4

Initial (cm³)

Seasons 0–2

Seasons 2–4

Seasons 0–4

Viking 21-7-14

25 g

25.8a

0.51ab

0.38bc

1.17ab

11.3a

0.71ab

0.35bc

1.38ab

54.1a

4.05ab

1.68bc

15.40ab

50 g

23.6a

0.44ab

0.46abc

1.14ab

11.0a

0.67ab

0.38bc

1.36ab

37.1ab

3.36abc

1.98abc

13.13ab

75 g

24.7a

0.55ab

0.52ab

1.37ab

10.9a

0.82a

0.43abc

1.64a

36.4ab

4.71a

2.26abc

19.36ab

100 g

22.6a

0.48ab

0.53ab

1.32ab

10.2a

0.66ab

0.40abc

1.36ab

27.8ab

3.43abc

2.14abc

14.88ab

Free Flow 29-3-4

25 g

24.0a

0.36b

0.38bc

0.91ab

10.7a

0.60ab

0.36bc

1.21ab

34.3ab

2.94bc

1.68bc

11.19ab

50 g

25.4a

0.53ab

0.64a

1.53a

11.2a

0.75a

0.55a

1.75a

35.4ab

4.25ab

3.18a

22.26a

75 g

23.8a

0.52ab

0.48abc

1.34ab

11.3a

0.74a

0.42abc

1.53ab

39.3ab

4.51a

2.16abc

20.46a

100 g

21.2a

0.43ab

0.55ab

1.24ab

9.2a

0.70ab

0.44abc

1.50ab

20.9b

3.71abc

2.41abc

17.50ab

High N 22-4-6

25 g

22.1a

0.48ab

0.41bc

1.16ab

10.2a

0.64ab

0.43abc

1.40ab

28.6ab

3.70abc

2.12abc

17.01ab

50 g

24.4a

0.68a

0.49abc

1.62a

12.3a

0.69ab

0.44abc

1.47ab

45.8ab

4.51a

2.28abc

19.67ab

75 g

25.7a

0.52ab

0.54ab

1.38ab

11.6a

0.67ab

0.54a

1.62a

45.0ab

3.63abc

2.93ab

20.54a

100 g

24.6a

0.44ab

0.56ab

1.33ab

11.4a

0.62ab

0.52ab

1.47ab

43.1ab

3.26abc

2.77ab

16.79ab

Milorganite 6-2-0

100 g

22.2a

0.50ab

0.41bc

1.17ab

10.1a

0.59ab

0.44abc

1.34ab

28.7ab

3.33abc

2.06bc

14.95ab

200 g

25.0a

0.50ab

0.32bc

1.06ab

11.7a

0.50ab

0.32c

1.01ab

48.9ab

2.82bc

1.49bc

10.63ab

300 g

23.1a

0.37b

0.45abc

1.05ab

10.2a

0.54ab

0.38bc

1.17ab

30.4ab

2.81bc

1.94bc

12.61ab

400 g

22.7a

0.48ab

0.42abc

1.26ab

10.4a

0.57ab

0.44abc

1.33ab

30.6ab

3.52abc

2.25abc

19.72ab

Nonfertilized

22.7a

0.32b

0.22c

0.69b

10.5a

0.39b

0.27c

0.81b

34.5ab

2.02c

1.13c

7.80b

^aWithin each growth variable and time of measurement, means sharing a common letter do not differ significantly at according to the LSD test; for each combination of formulation and application rate.
^bCalculated as the proportion increase in seedling size during the denoted period.