Dry Matter Distribution between the Shoot and Storage Root of Carrot (Daucus carota L.)

Hole, C. C.; Barnes, Anthony; Thomas, T. H.; Scott, Peter; Rankin, W. E. F.

doi:10.1093/oxfordjournals.aob.a086456

Cited by 30 publications

(23 citation statements)

References 12 publications

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“…Foliage dry weight also increases linearly until 100 to 120 DAS, followed by a plateau or slight decline thereafter (Platenius 1934;Rubatzky et al 1999;Westerveld et al 2006c). Timing of initiation and early development of the storage root are not influenced by cultivar (Hole et al 1983(Hole et al , 1987aWesterveld et al 2006c), but cultivar may influence the distribution of DM between the foliage and the root (Hole et al 1987b;Hole and Dearman 1991).…”

Section: Dry Matter Production and Partitioningmentioning

confidence: 99%

“…Between 35 and 65 DAS, dry weights of both the foliage and root increase exponentially (Hole et al 1983). After that, root dry weight increases linearly until harvest (Platenius 1934;Rubatzky et al 1999;Reid and English 2000;Strandberg 2001;Westerveld et al 2006c).…”

Section: Dry Matter Production and Partitioningmentioning

confidence: 99%

“…By 50-60 DAS, storage root DM production and N accumulation accelerate rapidly (Platenius 1934;Hole et al 1983;Rubatzky et al 1999;Reid and English 2000;Strandberg 2001;Westerveld et al 2006c). Growth of both the root and leaves is linear Can.…”

Section: Proposed Timeline For Nitrogen Dynam-mentioning

confidence: 99%

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Nitrogen utilization timeline of carrot over the growing season

Westerveld¹,

McDonald²,

McKeown³

2007

Can. J. Plant Sci.

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Westerveld, S. M., McDonald, M. R. and McKeown, A. W. 2007. Nitrogen utilization timeline of carrot over the growing season. Can. J. Plant. Sci. 87: 587-592. A timeline of nitrogen (N) dynamics of the carrot crop was developed based on studies on the effects of N application on carrot growth, N uptake and partitioning, and interactions with Alternaria [ALB; A. dauci (Kühn) Groves and Skolko] and Cercospora [CLB; C. carotae (Pass.) Solheim] leaf blight. Preplant-applied fertilizer N affects yield only when residual N in the top 60 cm of the soil profile is insufficient. The majority of the N required by the crop is taken up beyond 50 d after seeding (DAS). Carrots have a root system that extends to 150-cm depth and >50% of the fibrous root system occurs below 30-cm depth. It is likely that N below 30 cm depth is required beyond 50 DAS, since the majority of the fibrous roots are below 30 cm depth after that stage. There is insufficient time for sidedressed N to leach into the active root system beyond 50 DAS, unless its application is timed before irrigation or rain events. Regardless of the amount of residual N, preplant-applied N is essential for minimizing leaf blight severity. It is possible that leaf blight defences are conferred upon leaf emergence and may benefit from abundant N at this time. A preplant soil nitrate-N test from both the top 30 cm and the 30-to 60-cm depth could be useful for determining residual N levels and for adjusting N fertilizer application rates accordingly. . L'application d'engrais N avant la plantation n'affecte le rendement que lorsque la concentration de N résiduel dans les premiers 60 cm de sol est insuffisante. La majeure partie du N dont la culture a besoin est absorbé plus de 50 jours après les semis. Le système racinaire de la carotte s'enfonce jusqu'à 150 cm de profondeur et au-delà de la moitié des racines fibreuses se trouvent à plus de 30 cm dans le sol. Passé le 50 e jour suivant les semis, il est donc probable que la plante aille chercher le N qu'il lui faut à une profondeur supérieure à 30 cm. À cette date, le temps manque pour que le N épandu en bandes latérales parvienne jusqu'aux racines actives, à moins que l'engrais soit appliqué avant l'irrigation ou des précipitations. Peu importe la quantité de N résiduel, il est essentiel d'appliquer un engrais azoté avant les semis si l'on veut minimiser la gravité de la brûlure des feuilles. En effet, il se peut que la plante acquière ses moyens de défense contre la maladie à l'apparition des feuilles. Elle pourrait donc bénéficier d'une abondance de N à ce moment. Doser les nitrates dans la couche supérieure de 30 cm du sol et entre 30 et 60 cm de profondeur avant la plantation pourrait aider à établir la concentration de N résiduel et le taux d'application des engrais azotés nécessaire pour rectifier la situation. Solheim] leaf blight severity, depth and distribution of roots, and N uptake and partitioning by carrots over the season. The purpose of this review article is to summarize the research on N effects on carrots...

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Section: Dry Matter Production and Partitioningmentioning

confidence: 99%

Section: Dry Matter Production and Partitioningmentioning

confidence: 99%

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Nitrogen utilization timeline of carrot over the growing season

Westerveld¹,

McDonald²,

McKeown³

2007

Can. J. Plant Sci.

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“…between yielding and non-yielding parts of the plant (Hole et al 1983). In carrots ( Daucus Crop yield depends on total production of biomass and the distribution of dry matter the main sink where photosynthates are used and stored.…”

Section: Introductionmentioning

confidence: 99%

Effects of different fertilization practices on the growth, yield and dry matter content of carrot

Evers

1988

AFSci

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Abstract. The effects of different fertilization practices on the carrot root and shoot dry weights, yield, dry matter contents and root/shoot ratio were studied in field experiments. Unirrigated and irrigated placement and broadcast fertilization, fertirrigations without basic fertilization, fertirrigations with basic fertilization, and PK placement with N fertirrigations were compared. In addition, split application was compared to single application of nutrients. The soil nutrient levels were studied by soil analysis. The carrot root and shoot samples were collected three times during the growing period. Cv. Nantes Duke Notabene 370 was grown.The carrot shoots reached their maximum weight already by three months, whereas roots grew slowly during the first two months but grew considerably during both the third and fourth month. The root and shoot dry weights were positively correlated at all sampling dates in both years (r a o.77***), The big photosynthetizing apparatus caused the production of high root yield. The placement fertilization of granular NPK fertilizer increased the yield as compared to broadcast of granular NPK fertilizer (p = 0.009**). The yield was also increased by the placement of P and K as compared to treatments without placement fertilization of P and K (p = 0.03*). There was no difference in yields between single application and split application. Irrigation decreased the yield in 1985 (p = 0.03*). In 1986 the yield was significantly higher than in 1985 (p = 0.000***).At harvest the fertilization did not affect the dry matter content of carrot roots when compared with unfertilized treatments. The difference in dry matter content was greater between years (p = 0.000***) than between fertilization practices (p = 0.05*). The treatment PK placement with N fertirrigations yielded carrots with a higher dry matter content than did the NPK fertirrigation treatments. Besides the fertilization experiment samples from two organically cultivated fields were collected to obtain data concerning organicallycultivated carrots and soils.

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“…Cultivars of carrot which were different in shoot to root ratio at maturity showed similar values for the parameters, y and ri, and varied primarily in estimates of a [8] . a is closely related to the ratio of shoot to storage root at zero time .…”

Section: Introductionmentioning

confidence: 97%

Sink development and dry matter distribution in storage root crops

Hole¹,

Thomas²,

McKee³

1984

Plant Growth Regul

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Events during early development are examined for their contribution to dry matter distribution in the mature plant . It is concluded that timing of initiation of the storage root is not a major cause of differences between cultivars of carrot. These may arise from differences in the control of partitioning of assimilate at storage organ initiation . Root crop species may be affected differently by environmental factors such as density as a result of different thresholds of response of sink development to source stimuli .

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Dry Matter Distribution between the Shoot and Storage Root of Carrot (Daucus carota L.)

Cited by 30 publications

References 12 publications

Nitrogen utilization timeline of carrot over the growing season

Nitrogen utilization timeline of carrot over the growing season

Effects of different fertilization practices on the growth, yield and dry matter content of carrot

Sink development and dry matter distribution in storage root crops

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