Growth and nutrition of containerized Pinus Resinosa seedlings at varying moisture regimes

Timmer, V. R.; Armstrong, G.

doi:10.1007/bf00021580

Cited by 50 publications

(41 citation statements)

References 23 publications

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“…To prevent water and nutrient leaching, two plastic bags were placed in the bottom of the pots. Each pot was irrigated to 90% of field capacity determined gravimetrically when transplanting (Timmer and Armstrong 1989). The desired amount of fertilizer was injected into individual pots once a week using a mechanical pipettor.…”

Section: Plant Materials and Seedling Managementmentioning

confidence: 99%

Growth and nutrient uptake dynamics ofMytilaria laosensisseedlings under exponential and conventional fertilizations

Lin

Zeng

et al. 2012

Soil Science and Plant Nutrition

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The growth characteristics and nutrient uptake dynamics of Mytilaria laosensis Lec. seedlings treated weekly with conventional and exponential fertilizations were investigated at intervals of 3 weeks for 12 weeks in a greenhouse. Leaf area and pigment compositions were also examined at the final harvest. The fertility treatments (mg nitrogen seedling -1 ) included two conventional (50C and 100C) and four exponential (50E, 100E, 200E and 400E) fertilizations, and no fertilization (0) as control. The biomass and nutrient contents of M. laosensis seedlings increased exponentially with time. Steady-state nutrition of nitrogen (N) and phosphorus (P) were achieved under exponential fertilization treatment of 50 mg N seedling À1 (50E) and conventional fertilization treatment of 100 mg N seedling -1 (100C), resulting from simultaneous increase of their biomass and nutrient contents. The nutrient uptake efficiency continuously increased over time in conventionally fertilized seedlings, but it increased initially and declined or remained stable from 11 weeks after transplanting in the exponentially fertilized seedlings. At the end of the experiment, the conventionally fertilized seedlings performed remarkably better than all exponentially fertilized seedlings except for seedlings in the exponential treatment of 200 mg N seedling -1 (200E) in height, root collar diameter and biomass. The optimum N and P uptake occurred in 200E seedlings because their N and P contents were 71%/60% and 14%/9% higher than both conventionally fertilized seedlings (50C/100C) without significant differences in growth performance between them. The leaf areas and chlorophyll contents of seedlings increased significantly with the increase of fertilizer levels and nearly peaked at the range from 100 to 200 mg N seedling -1 , whereas the delivery schedule (conventional and exponential) had little effect on leaf areas and chlorophyll contents of seedlings at the same nutrient level (50 or 100 mg N seedling -1 ). These findings will provide evidence to make guidelines on fertilization for nursery production of M. laosensis, and help understand the nutrient demands for this species and further benefit the development of its plantations.

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Section: Plant Materials and Seedling Managementmentioning

confidence: 99%

Growth and nutrient uptake dynamics ofMytilaria laosensisseedlings under exponential and conventional fertilizations

Lin

Zeng

et al. 2012

Soil Science and Plant Nutrition

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“…Three split applications were conducted at 7, 14, and 28 days after planting to improve uptake efficiency. Pots were irrigated to container capacity at each fertigation [46,55]. A group of two crates represented an experimental unit.…”

Section: Greenhouse Transplanting Trialmentioning

confidence: 99%

Growth, physiology, and nutrient retranslocation in nitrogen-15 fertilized Quercus rubra seedlings

et al. 2008

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-We evaluated gas exchange, chlorophyll index (CI) using SPAD-502 chlorophyll meter, and leaf nutritional responses in one-year-old northern red oak (Quercus rubra L.) container seedlings transplanted into control (unfertilized) or fertilized (0.86 g N plant −1 ) sand culture and grown in a greenhouse for 90 days. We labeled current nitrogen (N) uptake with ( 15 NH 4 ) 2 SO 4 and directly quantified proportional contributions of N derived from fertilizer (NF) compared with retranslocation or N derived from plant (NP) in leaf growth of red oak seedlings. NF met a greater N demand in leaf growth of fertilized plants while unfertilized seedlings relied entirely on NP for their leaf growth. Fertilization increased leaf dry mass by 67% and new stem dry mass by 253% 90 days after transplanting compared to control seedlings. Specific leaf area (SLA) was not significantly altered but CI increased 90 days after transplanting. Higher leaf N concentration and content in fertilized compared with control seedlings was linked to greater chlorophyll concentrations in the former plants. The higher coefficient of determination (r 2 = 0.72) noted between leaf N concentrations and CI suggests that the SPAD meter could be a useful tool for assessing leaf N status in northern red oak seedlings. Fertilized seedlings exhibited higher net assimilation, stomatal conductance, and transpiration rates compared with controls. Increased seedling growth in response to fertilization was related to maintenance of higher gas exchange and greater nutrient uptake, which could improve outplanting success. fertilization / gas exchange / northern red oak / nitrogen / photosynthesis / retranslocation / SPAD meter Résumé -Croissance, échanges gazeux et réponses nutritionnelles de jeunes semis de Quercus rubra soumis à une fertilisation par ( 15 NH 4 ) 2 SO 4 . Nous avons estimé les échanges gazeux foliaires, un index de teneurs en chlorophylles (IC) avec un chlorophylle-mètre SPAD-502 et les teneurs en nutriments dans les feuilles de jeunes plants de chêne rouge d'Amérique (Quercus rubra L.) âgés d'un an. Les plants ont été transplantés dans du substrat sableux non fertilisé (témoins) ou fertilisé avec 0.86 g N par plante, et cultivés pendant 90 jours sous serre. L'azote apporté par la fertilisation était marqué avec ( 15 NH 4 ) 2 SO 4 et nous avons directement quantifié les contributions à la croissance foliaire de N apporté par la fertilisation (NF) par rapport à celle de N remobilisé depuis les pools de réserve de la plante (NP). NF constituait la fraction la plus importante d'azote foliaire de plants fertilisés, alors que l'azote foliaire des plants non fertilisés était exclusivement constitué de NP. La fertilisation s'est traduite par une augmentation, par rapport aux plantes témoins, de 67 % de la biomasse foliaire et de 253 % de la biomasse de tiges nouvellement formées 90 jours après la transplantation. La surface spécifique des feuilles n'était pas affectée par la fertilisation alors que CI avait significativement augmenté. Des teneur...

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“…Crates were arranged onto a greenhouse bench (mean day/night temperature of 24/20 °C) under ambient light conditions in the Department of Horticulture and Landscape Architecture Plant Growth Facility at Purdue University, West Lafayette IN, USA (40° 25'N, 86° 55'W). Each pot was irrigated to container capacity determined gravimetrically at planting [47,51]. Two weeks after planting, seedlings were thinned to leave one plant per pot.…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

“…Excess fertilization (e) may induce toxicity signified by diminished plant growth and N content at increasing tissue N concentration (adapted from [38] 4 -N (1.20%), NO 3 -N (11.75%) and urea-N (2.05%). Supplemental irrigation was supplied twice weekly at similar rates by periodic weighing of pots to determine amount of water to be added to return pots to container capacity [47,51] to avoid potential confounding effects of irrigation on treatment responses. The eight fertilizer treatments (0, 25C, 25E, 50E, 75E, 100E, 125E and 150E mg N plant -1 season -1 ) were randomly assigned to a group of two crates and arranged in a randomized complete block design with three replicates.…”

Section: Figurementioning

confidence: 99%

“…The more integrated approach utilizing plant dry mass and nutrient status (Figs. 1 and 2) can improve diagnostic reliability [38,47]. For example, elevated tissue nutrient concentration associated with increased fertilization is often wrongly diagnosed as a positive fertilizer response, but may in fact reflect an induced toxicity.…”

Section: Improving Diagnostic Precisionmentioning

confidence: 99%

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Characterizing fertility targets and multi-element interactions in nursery culture ofQuercus rubraseedlings

Salifu

Jacobs

2006

Ann. For. Sci.

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-We quantified and characterized fertility targets for nursery culture of container northern red oak (Quercus rubra L.) seedlings. Plants were supplied with a 15N-5P 2 O 5 -15K 2 O fertilizer at eight rates ranging from 0-150 mg N plant -1 and reared for 18 wk in a greenhouse. Plant growth and nutritional response to increased fertilization followed a curvilinear pattern depicting phases that ranged from deficiency to toxicity. Seedling dry mass production was maximized at sufficiency (25 mg N plant -1 season -1 ) while optimum N and P uptake occurred at 100 mg N plant -1 season -1 . The 150 mg N plant -1 seasonal dose rate induced N and P toxicity, but resulted in antagonistic K interaction. Nutrient loading raised plant N and P contents by 27 and 55%. This new approach demonstrates promise to help refine fertility targets for nursery production of Q. rubra planting stock and may have application to other hardwood species or cultural systems.antagonistic interaction / exponential fertilization / growth / luxury uptake / northern red oak / vector diagnosis Résumé -Caractérisation des objectifs de fertilité et des interactions multiéléments chez des semis de Quercus rubra cultivés en pépinière. Des objectifs de fertilité ont été quantifiés et caractérisés pour des semis de chêne rouge d'Amérique (Quercus rubra L.) cultivés en pépinière. Les semis ont été alimentés avec un engrais 15N-5P2O5-15K2O selon huit taux de 0-150 mg N plant -1 et ont poussés pendant 18 semaines dans une serre. La croissance des semis, leur réponse nutritionnelle à un accroissement de la fertilisation a suivi un modèle curvilinéaire décrivant des phases rangées depuis la carence jusqu'à la toxicité. La production en matière sèche des semis a été maximale à la dose suffisante correspondant à 25 mg N plant -1 saison -1 , tandis que l'optimum de consommation s'est situé à 100 mg N plant -1 saison -1 . La dose saisonnière de 150 mg N plant -1 a induit une toxicité N et P, mais il en est résulté une interaction antagoniste avec K. Le prélèvement de nutriments par les plants a augmenté le contenu en N et P de 27 % et 55 %. Cette nouvelle approche démontre la possibilité d'espérer perfectionner les objectifs de fertilité pour une production en pépinière de plants de Quercus rubra et peuvent avoir une application pour d'autres espèces feuillues et d'autres systèmes culturaux. interaction antagoniste / fertilisation exponentielle / croissance / consommation de luxe / chêne rouge / vecteur diagnose

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Growth and nutrition of containerized Pinus Resinosa seedlings at varying moisture regimes

Cited by 50 publications

References 23 publications

Growth and nutrient uptake dynamics ofMytilaria laosensisseedlings under exponential and conventional fertilizations

Growth and nutrient uptake dynamics ofMytilaria laosensisseedlings under exponential and conventional fertilizations

Growth, physiology, and nutrient retranslocation in nitrogen-15 fertilized Quercus rubra seedlings

Characterizing fertility targets and multi-element interactions in nursery culture ofQuercus rubraseedlings

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