Timing Nitrogen Applications for Quality Tops and Healthy Root Production in Carrot

Makries, Jeanette L.; Warncke, D. D.

doi:10.1080/00103624.2013.823987

Cited by 5 publications

(13 citation statements)

References 20 publications

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“…However, a yield plateau could not be identified over the range of included N rates. While results contrast with findings from other carrot studies under comparable climate and soils (Makries & Warncke, 2013; Noyes, 2018; Warncke, 1996), data suggest that under certain conditions (e.g., low soil cation exchange capacity, limited soil profile N supply, high‐yielding varieties, and weather conducive to N loss) higher total fertilizer N rates may be required to maximize yield (Hochmuth et al., 1999, 2021; Warncke et al., 2004; Westerveld, McDonald, et al., 2006). High carbon previous crop residues (e.g., corn in this study) may also increase carrot N requirements.…”

Section: Discussioncontrasting

confidence: 99%

Topdress strategies and remote sensing for nitrogen management in processing carrots

et al. 2023

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Improved nitrogen (N) fertilizer management strategies are required to optimize yield and quality in processing carrots (Daucus carota L.) while minimizing risks of N loss. A 2-year field study was conducted in commercial carrot fields near Hesperia and Pentwater, MI, USA, to investigate the effects of N fertilizer rate (29, 67, 135, and 202 kg ha −1 N), topdress N frequency (single vs. three split applications), and timing of split N applications on carrot production and N utilization. In addition, the potential for remote sensing-based vegetation indices (VIs) to guide in-season N topdress decisions was evaluated relative to conventional methods including petiole sap nitrate testing. Both carrot root yield and shoot biomass increased with greater N rates but did not plateau. Split-applied topdress N and timing of topdress applications did not affect yield. However, greater N rates, single front-loaded applications, and both earlier and later than typical topdress timings exhibited potential to increase N loss depending on the year. While VIs explained at most 66% and 29% of the variation in yield in 2019 and 2020, respectively, the indices consistently explained greater variation compared to petiole sap nitrate (6%), shoot N concentration (8%), and carrot root (10%) and shoot (14%) weights. Hypothetical N topdress decisions made using VI-based sufficiency indices recommended N 26% less often than petiole sap nitrate, but more research is needed to evaluate reference and threshold selections. Despite labor and technological tradeoffs, remote sensing may increase accuracy, resolution, and scalability of N decision support in processing carrot production. INTRODUCTIONEffective nitrogen (N) management is integral to optimizing carrot (Daucus carota L.) yield and quality while minimiz-Abbreviations: AGL, above ground level; BGI, blue-green index; GLI, green leaf index; GNDVI, green normalized difference vegetation index; NDRE, normalized difference red-edge index; NDVI, normalized difference vegetation index; NPCI, normalized pigment chlorophyll index; RGB, red green blue; RS, remote sensing; SI, sufficiency index; VI, vegetation index.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Discussioncontrasting

confidence: 99%

Topdress strategies and remote sensing for nitrogen management in processing carrots

et al. 2023

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“…These are detrimental to production and loss of nutritional qualities of most crops. Excessive amounts of soil organic matter also promote forking and reduce market acceptability and profitability [4].…”

Section: Introductionmentioning

confidence: 99%

Nutritional Quality Response of Carrot (Daucus carota) to Different Rates of Inorganic Fertilizer and Biochar

Asante¹,

Manu-Aduening²,

Essilfie³

2019

AJSSPN

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Nutritional quality of most high valued crops including carrot can be influenced by soil management practices. A field study to evaluate soil management improvement effect on nutritional quality of carrot was carried out in two contrasting cropping seasons of two rainfall regimes ranging from 600 mm to 800 mm in 2016 and 2017 at Mampong in the Forest-Savannah transition zone of Ghana. Three rates of soil amendments using biochar rates of 0, 5 and 10 tons/ha and five rates of inorganic fertilizers (NPK 15:15:15 at 200 kg/ha; P&K 50:50 at 50 kg/ha; P&K 50:100 at 50 kg/ha; Liquid Fertilizer at 1 L: 200 L Water/ha; and the control were applied using 3x5 factorial in RCBD. The combined analysis for the different treatments showed that NPK at 200 kg/ha+10 ton/ha biochar gave the highest protein content while Liquid fertilizer+5 ton/ha biochar gave the highest beta-carotene and total carotenoid contents in carrot root during the minor cropping season of 2016. However, during the major copping season of 2017, a combination of liquid fertilizer +10 ton/ha biochar gave the highest protein content whilst NPK at 200 kg/ha +5 ton/ha biochar gave the Asante et al.; AJSSPN, 5(2): 1-14, 2019; Article no.AJSSPN.51790 2 highest carotenoid content for the carrot. Nutritional contents such as carbohydrate, beta-carotene and total carotenoids were boosted by soil amendments. This indicates that both biochar and inorganic fertilizers have varying effects on the nutritional qualities of carrot. Original Research Article

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“…However, on a global scale, the use of inorganic fertilizers notably nitrogen and phosphates stress the rhizosphere, aquatic and atmospheric environments including causing soil acidification, increased agricultureassociated greenhouse gas (GHG) emissions and increased eutrophication of water bodies beyond planetary boundaries [3]. On the other hand excessive amounts of soil organic matter has been found to promote forking, reduce market acceptability and consequently reduce profitability of carrots [4]. A practice that holds much prospect for soil productivity, market acceptability, soil carbon stock improvement and in keeping pace with planetary boundaries, among others is amendment of soil with biochar [4].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand excessive amounts of soil organic matter has been found to promote forking, reduce market acceptability and consequently reduce profitability of carrots [4]. A practice that holds much prospect for soil productivity, market acceptability, soil carbon stock improvement and in keeping pace with planetary boundaries, among others is amendment of soil with biochar [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Rates of Fertilizer and Biochar on Growth and Yield of Carrot (Daucus carota) in the Forest-Savannah Transitional Zone of Ghana

Asante¹,

Essilfie

Manu-Aduening

2020

AJRCS

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Two field studies to evaluate the effect of biochar and fertilizer application rates on soil and on the growth and yield of carrot (Daucus carota) were carried out in 2016 and 2017 at Mampong-Ashanti in the forest-savannah transitional zone of Ghana. Three rates of biochar - 0, 5 and 10 tons ha-1 and five rates of inorganic fertilizers - NPK 15:15:15 at 200 kg ha-1; P&K 50:50 at 50 kg ha-1; P&K 50:100 at 50 kg ha-1; Liquid Fertilizer at 1 L: 200 L water ha-1; and the control - were applied using 3×5 factorial arranged in a randomized complete block design with 3 replicates. The analysis showed significant (P<0.01) interaction of fertilizer × biochar on bulk density, soil porosity, soil pH, organic carbon, total nitrogen and organic matter producing both positive and negative correlations between the soil variables and on total yield, partitioning coefficient and net assimilation rate. The significant two-way interactions and correlation results underscored the need to define expected production outcomes to inform which soil management system is needed to promote sustainable agriculture as different fertilizer and biochar rates affect growth and yield parameters differently.

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Timing Nitrogen Applications for Quality Tops and Healthy Root Production in Carrot

Cited by 5 publications

References 20 publications

Topdress strategies and remote sensing for nitrogen management in processing carrots

Topdress strategies and remote sensing for nitrogen management in processing carrots

Nutritional Quality Response of Carrot (Daucus carota) to Different Rates of Inorganic Fertilizer and Biochar

Influence of Different Rates of Fertilizer and Biochar on Growth and Yield of Carrot (Daucus carota) in the Forest-Savannah Transitional Zone of Ghana

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