Urea Fertilizer Effects on Dissolved Nutrient Concentrations in Some Forest Soils

Otchere-Boateng, J.; Ballard, T. M.

doi:10.2136/sssaj1978.03615995004200030026x

Cited by 13 publications

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“…menziesii) and jack pine (Pinus banksiana Lamb.) Increased availability of Ca, Mg, Mn, and B likely resulted from organic matter mobilization following urea application and subsequent changes in soil pH due to ureolysis and nitrification (Otchere-Boateng and Ballard 1978Ballard , 1981. Our observed long-term reductions in Mn and B concentrations in hemlock on fertilized CH sites contradicts Weetman et al (1989), who noted a substantial increase in foliar Mn and B concentrations in hemlock associated with N and P fertilization on a CH site one growing season after treatment.…”

Section: Discussionmentioning

confidence: 50%

Growth and foliar nutrition of juvenile western hemlock and western redcedar plantations on low- and medium-productivity sites on northern Vancouver Island: response to fertilization and planting density

2007

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A factorial trial was established to examine the effects of planting density and fertilization on the growth of western redcedar (Thuja plicata Donn ex D. Don) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) on nutrient-poor (CH) sites and nutrient-medium (HA) sites. Two levels of NPK fertilization were crossed with three levels of planting density (500, 1500, and 2500 stems/ha). Fifteen years after establishment and 10 years after the last fertilizer application, height, individual stem volume increment, stand volume, 5 year periodic annual increment (PAI), and 5 year periodic height increment were all increased by fertilization. Fertilization of CH sites increased annual stand volume increment by 753%-2552% and 122%-209% for hemlock and cedar, respectively; fertilization of HA sites increased PAI by 94%-264%. Volume growth response to fertilization was greater on HA than on CH sites. Increasing stand density reduced height growth on CH sites but not on HA sites. These results suggest that competition for nutrients can be a significant growth-limiting factor even before canopy closure occurs and that treatment of ericaceous sites may not be justified by productivity increases.Résumé : Un dispositif factoriel a été mis en place pour étudier les effets de la densité de plantation et de la fertilisation sur la croissance du thuya géant (Thuja plicata Donn ex D. Don) et de la pruche de l'Ouest (Tsuga heterophylla (Raf.) Sarg.) établis sur des stations pauvres (CH) et modérément riches (HA) en nutriments. Deux niveaux de fertilisation en NPK ont été appliqués dans chacun des trois niveaux de densité de plantation (500, 1500 et 2500 tiges/ha). Quinze ans après l'établissement et 10 ans après l'application de la dernière fertilisation, la hauteur, l'accroissement en volume des tiges individuelles, le volume du peuplement, l'accroissement annuel périodique quinquennal (AAP) et l'accroissement périodique quinquennal en hauteur ont tous augmenté à cause de la fertilisation. La fertilisation des stations CH a augmenté l'accroissement annuel en volume du peuplement de 753 % à 2552 % pour la pruche et de 122 % à 209 % pour le thuya. La fertilisation des stations HA a augmenté l'AAP de 94 % à 264 %. À la suite de la fertilisation, la réaction de la croissance en volume des stations HA a été supérieure à celle des stations CH. L'augmentation de la densité des peuplements a réduit la croissance en hauteur sur les stations CH, mais pas sur les stations HA. Ces résultats indiquent que la compétition pour les nutriments peut être un facteur important pour limiter la croissance des arbres avant même que survienne la fermeture de la canopée. De plus, il est possible que le traitement des stations à éricacées ne soit pas justifié par des augmentations de la productivité.[Traduit par la Rédaction]

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Section: Discussionmentioning

confidence: 50%

Growth and foliar nutrition of juvenile western hemlock and western redcedar plantations on low- and medium-productivity sites on northern Vancouver Island: response to fertilization and planting density

2007

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“…Th is DON leaching may be due to the increase in pH that occurred after urea hydrolysis whereby soil organic matter is made more soluble (Stevenson, 1994). Otchere-Boateng and Ballard (1978) also found increases in DON concentrations after urea fertilization in soil solutions collected from lysimeters placed below the forest fl oor.…”

Section: Nitrogen Fluxesmentioning

confidence: 72%

Nitrogen Leaching from Douglas‐fir Forests after Urea Fertilization

et al. 2008

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Leaching of nitrogen (N) after forest fertilization has the potential to pollute ground and surface water. The purpose of this study was to quantify N leaching through the primary rooting zone of N-limited Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] forests the year after fertilization (224 kg N ha(-1) as urea) and to calculate changes in the N pools of the overstory trees, understory vegetation, and soil. At six sites on production forests in the Hood Canal watershed, Washington, tension lysimeters and estimates of the soil water flux were used to quantify the mobilization and leaching of NO(3)-N, NH(4)-N, and dissolved organic nitrogen below the observed rooting depth. Soil and vegetation samples were collected before fertilization and 1 and 6 mo after fertilization. In the year after fertilization, the total leaching beyond the primary rooting zone in excess of control plots was 4.2 kg N ha(-1) (p = 0.03), which was equal to 2% of the total N applied. The peak NO(3)-N concentration that leached beyond the rooting zone of fertilized plots was 0.2 mg NO(3)-N L(-1). Six months after fertilization, 26% of the applied N was accounted for in the overstory, and 27% was accounted for in the O+A horizon of the soil. The results of this study indicate that forest fertilization can lead to small N leaching fluxes out of the primary rooting zone during the first year after urea application.

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“…Hinge position soils at Tanli had significantly higher levels of min-N and NH 4 -N at a depth of 0-10 cm in year 10, and for min-N, this trend continued to year 20 (24 versus 10 mg kg −1 for min-N). Nitrate-N is highly leachable [55,56], which may partly explain why, by year 10, increases could not be detected in the surface 0-10 cm of mineral soil for any burning-position combination, and also why there was a profound decline in this form of nitrogen between years 10 and 20 (Table 1). Mineralization rates, uptake by plants, and seasonal variation in N cycling [24] may also have contributed to the differences since N availability is strongly linked to biological processes.…”

Section: Soil Chemical Propertiesmentioning

confidence: 99%

Soil Characteristics and Lodgepole Pine (Pinus contortavar.latifolia) Performance Two Decades after Disk Trenching of Unburned and Broadcast-Burned Plots in Subboreal British Columbia

Boateng

Heineman²,

Bedford

et al. 2011

International Journal of Forestry Research

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We examined the effects of low-impact broadcast-burning and disk-trenching planting position (control, hinge, trench) on soil characteristics and lodgepole pine foliar nutrition and growth over two decades at a subboreal site in British Columbia, Canada. Broadcast burning had virtually no effect on either the bulk density or chemical properties of soil. In contrast, significant reductions in soil bulk density and increases in soil nutrient availability persisted for 20 years in hinge position soils relative to undisturbed (control) soil between trenches. These effects on bulk density and nutrient availability are associated with significant differences in pine size by year 6. Burning and planting positions interacted significantly in their effect on pine height, diameter, and stem volume for at least 19 years. Pine survival was high regardless of burning or planting position. Neither broadcast burning nor planting position significantly affected lodgepole pine foliar nutrient status in this study.

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Urea Fertilizer Effects on Dissolved Nutrient Concentrations in Some Forest Soils

Cited by 13 publications

References 0 publications

Growth and foliar nutrition of juvenile western hemlock and western redcedar plantations on low- and medium-productivity sites on northern Vancouver Island: response to fertilization and planting density

Growth and foliar nutrition of juvenile western hemlock and western redcedar plantations on low- and medium-productivity sites on northern Vancouver Island: response to fertilization and planting density

Nitrogen Leaching from Douglas‐fir Forests after Urea Fertilization

Soil Characteristics and Lodgepole Pine (Pinus contortavar.latifolia) Performance Two Decades after Disk Trenching of Unburned and Broadcast-Burned Plots in Subboreal British Columbia

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