Mineral nutrition and growth of containerized Pinus halepensis seedlings under controlled-release fertilizer
Low, moderate and high rates (3, 5 and 7 g/l, respectively) of two controlled-release fertilizer (CRF) types, Osmocote 9-13-18 and Osmocote 17-10-10 were evaluated for their effects on production of containerized Pinus halepensis planting stock. Both formulations had similar patterns of nutrient release, with high release rates during the first 2-3 months, in contrast with minimum seedling uptake (determined by stem volume current increment). Shoot morphological attributes improved with increasing application rate regardless of formulation, though root growth was not affected. Shoot/root ratio was significantly affected by both factors, with the highest value (3.3 g/g) observed with Osmocote 17-10-10 at the 7 g/l rate. Needle N concentration was significantly affected by both rate and formulation, with 17-10-10 at the 7 g/l rate producing the highest value (18.5 mg/g). Needle P concentration was not affected by rate, and was low in all treatments (maximum of 2.2 mg/g), particularly in the 17-10-10 formulation, suggesting that P enrichment may be needed to improve its composition. Needle K concentration was significantly affected by rate, regardless of formulation. Absorption efficiency of N was near 40% in all treatments, although K and P recovery was lower. The CRF types used in this study may be useful for plant production of P. halepensis, promoting suitable morphological values and nutritional status. © 2004 Elsevier B.V. All rights reserved.
| Main Authors: | , , , , |
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| Format: | journal article biblioteca |
| Language: | English |
| Published: |
Elsevier
2004
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| Subjects: | Slow-release fertilizers, Forest seedling nutrition, Pinus halepensis, Forest seedling quality, Nutrient recovery, |
| Online Access: | http://hdl.handle.net/20.500.12792/3195 http://hdl.handle.net/10261/294002 |
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| Summary: | Low, moderate and high rates (3, 5 and 7 g/l, respectively) of two controlled-release fertilizer (CRF) types, Osmocote 9-13-18 and Osmocote 17-10-10 were evaluated for their effects on production of containerized Pinus halepensis planting stock. Both formulations had similar patterns of nutrient release, with high release rates during the first 2-3 months, in contrast with minimum seedling uptake (determined by stem volume current increment). Shoot morphological attributes improved with increasing application rate regardless of formulation, though root growth was not affected. Shoot/root ratio was significantly affected by both factors, with the highest value (3.3 g/g) observed with Osmocote 17-10-10 at the 7 g/l rate. Needle N concentration was significantly affected by both rate and formulation, with 17-10-10 at the 7 g/l rate producing the highest value (18.5 mg/g). Needle P concentration was not affected by rate, and was low in all treatments (maximum of 2.2 mg/g), particularly in the 17-10-10 formulation, suggesting that P enrichment may be needed to improve its composition. Needle K concentration was significantly affected by rate, regardless of formulation. Absorption efficiency of N was near 40% in all treatments, although K and P recovery was lower. The CRF types used in this study may be useful for plant production of P. halepensis, promoting suitable morphological values and nutritional status. © 2004 Elsevier B.V. All rights reserved. |
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