Plant Nitrogen Status of Southern Highbush Blueberry (<i>Vaccinium corymbosum</i>L. Interspecific Hybrid) Grown in Pine Bark Amended Soils with Varying Rates of Nitrates

Smith, Erick; Harris, Glendon H.

doi:10.1080/00103624.2017.1299169

Cited by 2 publications

(3 citation statements)

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“…2). All leaf N concentrations were within previously established sufficiency ranges for blueberry (Smith and Harris, 2017;Strik and Vance, 2015). In addition, leaf chlorophyll status did not change between acclimation and treatment periods (49.1 SPAD vs. 52.4 SPAD, P = 0.21), and it was not significantly different between NH 4 + /NH 4 + and NH 4 + /0N plants during the treatment period (55.0 SPAD vs. 49.9 SPAD, P = 0.11).…”

Section: Resultssupporting

confidence: 58%

“…Although NH 4 + -containing fertilizers are the basis for blueberry nutrition, NO 3 is not absent from the blueberry rhizosphere. Fertilizers used for conventional (Kennedy, 2011;Liu et al, 2012;Smith and Harris, 2017) and organic (Larco et al, 2013) blueberry production can contain mixes of NH 4 + and NO 3 -. Also, nitric acid-which dissociates into NO 3 --can be used to acidify blueberry fertigation (Gallegos-Cedillo et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

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Ammonium Uptake Is the Main Driver of Rhizosphere pH in Southern Highbush Blueberry

Imler¹,

Arzola²,

Nunez³

2019

horts

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Unlike most horticultural crops, blueberry (Vaccinium spp. section cyanococcus) prefers low-pH (4.2–5.5) soils. Other plants can acidify their rhizosphere to create a hospitable microenvironment. Southern highbush blueberry (SHB; Vaccinium corymbosum interspecific hybrids) plants do not acidify their rhizosphere in response to Fe deficiency, but other factors that affect rhizosphere pH have not been elucidated. We report results from two hydroponic experiments exploring N uptake effects on the rhizosphere pH of ‘Emerald’ SHB. Ammonium (NH4+) uptake led to rhizosphere acidification, whereas nitrate (NO3–) uptake led to rhizosphere alkalization. When grown in a split-root hydroponic system, roots that took up NH4+ acidified the rhizosphere to a greater extent that roots not exposed to NH4+. Rhizosphere acidification was observed even in a nontreated control. These results suggest that NH4+ uptake is the main driver of rhizosphere pH in SHB. N form effects suggest that fertilization with NO3– might lead to undesirable rhizosphere alkalization.

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Ammonium Uptake Is the Main Driver of Rhizosphere pH in Southern Highbush Blueberry

Imler¹,

Arzola²,

Nunez³

2019

horts

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show abstract

“…Size-related traits indicate the overall growth status of bushes, which are related to yield potential. Studies were conducted to use size-related traits to evaluate blueberry vegetative growth under various environments, showing a reasonable correlation between those traits (e.g., bush height) and berry yield 7,8 . Bush shape describes the geometry of bushes, which is an important factor affecting the performance of OTR mechanical harvesters.…”

Section: Introductionmentioning

confidence: 99%

3D point cloud data to quantitatively characterize size and shape of shrub crops

Takeda

et al. 2019

Hortic Res

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Size and shape are important properties of shrub crops such as blueberries, and they can be particularly useful for evaluating bush architecture suited to mechanical harvesting. The overall goal of this study was to develop a 3D imaging approach to measure size-related traits and bush shape that are relevant to mechanical harvesting. 3D point clouds were acquired for 367 bushes from five genotype groups. Point cloud data were preprocessed to obtain clean bush points for characterizing bush architecture, including bush morphology (height, width, and volume), crown size, and shape descriptors (path curve λ and five shape indices). One-dimensional traits (height, width, and crown size) had high correlations ( R 2 = 0.88–0.95) between proposed method and manual measurements, whereas bush volume showed relatively lower correlations ( R 2 = 0.78–0.85). These correlations suggested that the present approach was accurate in measuring one-dimensional size traits and acceptable in estimating three-dimensional bush volume. Statistical results demonstrated that the five genotype groups were statistically different in crown size and bush shape. The differences matched with human evaluation regarding optimal bush architecture for mechanical harvesting. In particular, a visualization tool could be generated using crown size and path curve λ , which showed great potential of determining bush architecture suitable for mechanical harvesting quickly. Therefore, the processing pipeline of 3D point cloud data presented in this study is an effective tool for blueberry breeding programs (in particular for mechanical harvesting) and farm management.

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Plant Nitrogen Status of Southern Highbush Blueberry (Vaccinium corymbosumL. Interspecific Hybrid) Grown in Pine Bark Amended Soils with Varying Rates of Nitrates

Cited by 2 publications

References 20 publications

Ammonium Uptake Is the Main Driver of Rhizosphere pH in Southern Highbush Blueberry

Ammonium Uptake Is the Main Driver of Rhizosphere pH in Southern Highbush Blueberry

3D point cloud data to quantitatively characterize size and shape of shrub crops

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