SEEDLING EFFECT ON ROOT SUBSTRATE pH

Huang, Jiashun; Nelson, Paul V.; Lee, Ji-Weon

doi:10.1081/pln-100106972

Cited by 9 publications

(7 citation statements)

References 2 publications

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“…As an example, ammonium uptake often predominates in blueberries (Hanson, 2006). A large differential effect of species on substrate pH during germination and early seedling growth was reported by Huang et al (2001). Johnson et al (2013) found a strong species effect on substrate pH when growing three bedding plant species for 4 weeks.…”

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confidence: 86%

Effect of Plant Species, Fertilizer Acidity/Basicity, and Fertilizer Concentration on pH of Soilless Root Substrate

Jeong¹,

Nelson²,

Niedziela³

et al. 2016

horts

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The objective of this study was to determine how plant species, fertilizer potential acidity/basicity rating (PABR), and fertilizer concentration affect root substrate pH. Three experiments were conducted. In the first experiment, 13 herbaceous species were grown in a root substrate of three sphagnum peatmoss: one perlite (v/v) with deionized water and a neutral fertilizer (NF) with a PABR of 0 for 78 days to determine species relationships to substrate pH. The decrease in substrate pH ranged from 0.14 to 2.45 units, depending on species. In the second experiment, four of the 13 species from the previous trial representing the range of pH suppression were grown under similar growth conditions as the first experiment for 70 days. Substrate pH was lowered in the range of 0.47 to 2.72 units. In the third experiment, three fertilizers with PABRs of 150 kg·t−1 CaCO3 equivalent alkalinity, 0 neutral, and 193 kg·t−1 CaCO3 equivalent acidity were applied in a factorial design at 100 and 200 mg·L−1 N at each irrigation to kalanchoe (the species with the greatest pH suppression from the previous experiments) for 56 days. When applied at the lower fertilizer rate (100 mg·L−1 N), the PABRs resulted in the final substrate pH levels of 4.68, 5.60, and 6.11 for the acidic fertilizer (AF), NF, and basic fertilizer (BF), respectively. At the high fertilizer rate (200 mg·L−1 N), substrate pH declined continuously to 3.97, 4.03, and 4.92 for the AF, NF, and BF, respectively. Expression of PABR depended on the balance between the abiotic (chemical) effect of the fertilizers vs. the biotic (physiological) effects of the fertilizers on microbes and plants. The PABR was best expressed when the fertilizer supply was just adequate or lower indicating a closer connection to the biotic effect.

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confidence: 86%

Effect of Plant Species, Fertilizer Acidity/Basicity, and Fertilizer Concentration on pH of Soilless Root Substrate

Jeong¹,

Nelson²,

Niedziela³

et al. 2016

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“…At the last pour-through (week 12), the pH in arbovitae averaged 6.3 while pH of japanese spirea averaged 7.5. Alteration of rhizosphere pH has been reported in several crop plants, including floral crops, and has been explained by the differential uptake of cations/anions and the proportional efflux of hydrogen ions (Dickson et al, 2016;Huang et al, 2001;Johnson et al, 2013;Taylor et al, 2010). Fertilizer had a significant impact on pH in arbovitae, especially in the first 9 weeks, but Fertilizer 3 resulted in a lower pH at the first two pourthrough dates for both species which corresponds to the highest release rate during the time period.…”

Section: Resultsmentioning

confidence: 91%

Plant Growth and Leachate Electrical Conductivity and pH as Influenced by Controlled-release Fertilizer Blends and Coating Technologies

Grable¹,

Knight²,

Ingram³

2017

hortte

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Although controlled-release fertilizers (CRFs) have been used in container-grown ornamental plants for decades, new coating technologies and blends of fertilizers coated for specific release rates are being employed to customize fertility for specific environments and crops. A study was conducted in the transitional climate of Kentucky to determine the nutrient release rates of three controlled-release blends of 8- to 9-month release and growth response of ‘Double Play Pink’ japanese spirea (Spiraea japonica) and ‘Smaragd’ arbovitae (Thuja occidentalis). Fertilizer 1 (16N–3.5P–8.3K–1.8Mg + trace elements) and Fertilizer 2 (18N–3.1P–8.3K–1.8Mg + trace elements) were prototype blends with different experimental polymer coatings. Fertilizer 3 was a blend of 18N–2.2P–6.6K–1.1Ca–1.4Mg–5.8S + trace elements, which combined 100% resin-coated prills with a polymer coating. Fertilizer 4 was commercially available 15N–3.9P–10K–1.3Mg–6S + trace elements. Fertilizer 3 released its nutrients earlier in the 12-week study than the other three fertilizers and resulted in lower shoot dry weight in both species. The new polymer coating technologies show promise for delivering a predicted release rate and are appropriate for container production of these woody shrubs in Kentucky. An interesting side note of this experiment was that leachate pH measurements across treatments averaged 1.2 units lower for arbovitae (6.3) than for japanese spirea (7.5) at week 12. It was assumed that chemical and/or biological reactions at the root/substrate interface in arbovitae moderated pH increases over the study.

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“…), and zinnia (Zinnia elegans Jacq.) had lowered substrate-pH (Huang et al, 2001). Johnson et al (2013) found that geranium was more acidic and lowered substrate-pH compared to petunia which was more basic and resulted in higher pH, with impatiens being intermediate to geranium and petunia.…”

Section: Introductionmentioning

confidence: 99%

Solution Ammonium: Nitrate ratio and cation/anion uptake affect acidity or basicity with floriculture species in hydroponics

Dickson

Fisher

Argo³

et al. 2016

Scientia Horticulturae

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Floriculture crops affect substrate-pH and resulting solubility of micronutrients in the root zone during commercial production. Two hydroponic experiments and tissue data from a container study were analyzed to determine whether (1) cation or anion uptake was related to solution acidity and basicity in the root zone for three floriculture crops [geranium (Pelargonium x hortorum, Bailey. L.H.), petunia (Petunia x hybrid, Vilm.-Andr.), and impatiens (Impatiens wallerana, Hook. F.)] and whether (2) the proportion of NH 4 +-N versus NO 3-impatiens and 20% NH 4 +-N for petunia would be expected to result in a neutral pH response in a hydroponic solution with zero alkalinity. Evaluating cation/anion uptake ratio across a range of NH 4 + :NO 3 ratios could be used to predict the relative acidity or basicity of other plant species to assist in pH management.

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SEEDLING EFFECT ON ROOT SUBSTRATE pH

Cited by 9 publications

References 2 publications

Effect of Plant Species, Fertilizer Acidity/Basicity, and Fertilizer Concentration on pH of Soilless Root Substrate

Effect of Plant Species, Fertilizer Acidity/Basicity, and Fertilizer Concentration on pH of Soilless Root Substrate

Plant Growth and Leachate Electrical Conductivity and pH as Influenced by Controlled-release Fertilizer Blends and Coating Technologies

Solution Ammonium: Nitrate ratio and cation/anion uptake affect acidity or basicity with floriculture species in hydroponics

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