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 rateHeightDiameterVolume
Relative growthbRelative growthbRelative growthb
Initial (cm)Seasons 0–2Seasons 2–4Seasons 0–4Initial (mm)Seasons 0–2Seasons 2–4Seasons 0–4Initial (cm3)Seasons 0–2Seasons 2–4Seasons 0–4

Viking 21-7-14
 25 g25.8a0.51ab0.38bc1.17ab11.3a0.71ab0.35bc1.38ab54.1a4.05ab1.68bc15.40ab
 50 g23.6a0.44ab0.46abc1.14ab11.0a0.67ab0.38bc1.36ab37.1ab3.36abc1.98abc13.13ab
 75 g24.7a0.55ab0.52ab1.37ab10.9a0.82a0.43abc1.64a36.4ab4.71a2.26abc19.36ab
 100 g22.6a0.48ab0.53ab1.32ab10.2a0.66ab0.40abc1.36ab27.8ab3.43abc2.14abc14.88ab

Free Flow 29-3-4
 25 g24.0a0.36b0.38bc0.91ab10.7a0.60ab0.36bc1.21ab34.3ab2.94bc1.68bc11.19ab
 50 g25.4a0.53ab0.64a1.53a11.2a0.75a0.55a1.75a35.4ab4.25ab3.18a22.26a
 75 g23.8a0.52ab0.48abc1.34ab11.3a0.74a0.42abc1.53ab39.3ab4.51a2.16abc20.46a
 100 g21.2a0.43ab0.55ab1.24ab9.2a0.70ab0.44abc1.50ab20.9b3.71abc2.41abc17.50ab

High N 22-4-6
 25 g22.1a0.48ab0.41bc1.16ab10.2a0.64ab0.43abc1.40ab28.6ab3.70abc2.12abc17.01ab
 50 g24.4a0.68a0.49abc1.62a12.3a0.69ab0.44abc1.47ab45.8ab4.51a2.28abc19.67ab
 75 g25.7a0.52ab0.54ab1.38ab11.6a0.67ab0.54a1.62a45.0ab3.63abc2.93ab20.54a
 100 g24.6a0.44ab0.56ab1.33ab11.4a0.62ab0.52ab1.47ab43.1ab3.26abc2.77ab16.79ab

Milorganite 6-2-0
 100 g22.2a0.50ab0.41bc1.17ab10.1a0.59ab0.44abc1.34ab28.7ab3.33abc2.06bc14.95ab
 200 g25.0a0.50ab0.32bc1.06ab11.7a0.50ab0.32c1.01ab48.9ab2.82bc1.49bc10.63ab
 300 g23.1a0.37b0.45abc1.05ab10.2a0.54ab0.38bc1.17ab30.4ab2.81bc1.94bc12.61ab
 400 g22.7a0.48ab0.42abc1.26ab10.4a0.57ab0.44abc1.33ab30.6ab3.52abc2.25abc19.72ab

Nonfertilized22.7a0.32b0.22c0.69b10.5a0.39b0.27c0.81b34.5ab2.02c1.13c7.80b

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.