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Response of Ponderosa Pine to Controlled-Release Fertilizers Item Info

Prior to sowing seeds, three controlled-release fertilizers (fast release (FR), moderate release (MR) and slow release (SR)) were incorporated into the growing media at rates of 0.8, 1.6 or 3.2 grams per seedling as supplements to nursery supplied soluble fertilizer. Effects on seedling caliper and height growth, biomass allocation, nutrient status and root growth potential of the "160190" container ponderosa pine (Pinusponderosa Doug. ex Laws) both in the greenhouse and after planting were evaluated. At lifting (December 1 of 1996), the caliper, height and total dry weight of fertilized seedlings ranged from 3.2 to 3.6 mrn, 15.8 to 17.9 cm and 2.6 to 3.9 grams, respectively, compared to the 2.8 mm, 14.8 cm and 2.0 grams of unfertilized seedlings. The 3.2 grams of MR or SR fertilizer treatments produced foliar N, Mg, B, Fe and Cu deficiency patterns and decreased ponderosa pine seedling root growth potential. Two years after planting, fertilization significantly increased seedling caliper, height, total and component biomass, but did not change component dry weight ratios and shoot/root ratios. The 3.2 grams of MR or SR fertilizer treatments produced significantly higher mortality (55 and 36 % respectively) than the controls. The mortality was strongly correlated with root growth potential. The best dosage for caliper and height growth was 2.0 and 1.9 grams per seedling for FR fertilizer, 1.8 and 2.0 grams per seedling for MR fertilizer and 1.8 and 2.1 grams per seeding for SR fertilizer, respectively. In another experiment, four controlled-release fertilizers (fast release (FR), moderate release (MR), slow release (SR) and slow-release with micro-nutrient extended (ME)) were applied at rates of 5, 15 and 30 grams per seedling respectively, into a hole 6 inches deep and 3 inches apart from the planting point of the "160190" ponderosa pine seedlings on the up-hill side immediately after planting. No significant caliper and height growth was found after three growing seasons. Insufficient nutrient supply resulted in continuous decrease of foliar N and P concentrations and foliar B, Cu and Fe deficiency and subsequently non-significant growth response at the experimental site.

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Title:
Response of Ponderosa Pine to Controlled-Release Fertilizers
Creator:
Fan, Zhaofei
Date Created:
1999-07
Description:
Prior to sowing seeds, three controlled-release fertilizers (fast release (FR), moderate release (MR) and slow release (SR)) were incorporated into the growing media at rates of 0.8, 1.6 or 3.2 grams per seedling as supplements to nursery supplied soluble fertilizer. Effects on seedling caliper and height growth, biomass allocation, nutrient status and root growth potential of the "160190" container ponderosa pine (Pinusponderosa Doug. ex Laws) both in the greenhouse and after planting were evaluated. At lifting (December 1 of 1996), the caliper, height and total dry weight of fertilized seedlings ranged from 3.2 to 3.6 mrn, 15.8 to 17.9 cm and 2.6 to 3.9 grams, respectively, compared to the 2.8 mm, 14.8 cm and 2.0 grams of unfertilized seedlings. The 3.2 grams of MR or SR fertilizer treatments produced foliar N, Mg, B, Fe and Cu deficiency patterns and decreased ponderosa pine seedling root growth potential. Two years after planting, fertilization significantly increased seedling caliper, height, total and component biomass, but did not change component dry weight ratios and shoot/root ratios. The 3.2 grams of MR or SR fertilizer treatments produced significantly higher mortality (55 and 36 % respectively) than the controls. The mortality was strongly correlated with root growth potential. The best dosage for caliper and height growth was 2.0 and 1.9 grams per seedling for FR fertilizer, 1.8 and 2.0 grams per seedling for MR fertilizer and 1.8 and 2.1 grams per seeding for SR fertilizer, respectively. In another experiment, four controlled-release fertilizers (fast release (FR), moderate release (MR), slow release (SR) and slow-release with micro-nutrient extended (ME)) were applied at rates of 5, 15 and 30 grams per seedling respectively, into a hole 6 inches deep and 3 inches apart from the planting point of the "160190" ponderosa pine seedlings on the up-hill side immediately after planting. No significant caliper and height growth was found after three growing seasons. Insufficient nutrient supply resulted in continuous decrease of foliar N and P concentrations and foliar B, Cu and Fe deficiency and subsequently non-significant growth response at the experimental site.
Document Type:
Thesis
Library Call Number:
SD397 P6ll5 f36 1999
Subjects:
West Hatter Creek controlled-release fertilizer fertilizer ponderosa pine pinus ponderosa biomass allocation nutrient status containerized seedlings soluble fertilizer silviculture
UIEF Unit:
West Hatter Creek
Section:
S33
Township:
T41N
Range:
R4W
Location:
UIEF; West Hatter Creek
Latitude:
46.83765
Longitude:
-116.824734
Department:
Department of Forest Resources
Type:
text
Format:
application/pdf

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Preferred Citation:
"Response of Ponderosa Pine to Controlled-Release Fertilizers", UIEF Research Exchange, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/uief/items/uief_0037.html
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In copyright, educational use permitted.
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