Soil and plant tissue testing for nitrogen management in carrots

Warncke, D. D.

doi:10.1080/00103629609369580

Cited by 27 publications

(53 citation statements)

References 10 publications

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“…A interpretação do método N min baseia-se numa relação linear do conteúdo de N-mineral no solo e a dose óti-ma do fertilizante nitrogenado (Wadman et al, 1990;Warncke, 1996). Essa relação é obtida em experimentos com múl-tiplas doses de N (Neeteson, 1995).…”

Section: Introductionunclassified

Critérios para a determinação da dose de nitrogênio a ser aplicada no tomateiro em ambiente protegido

Araújo

Fontes²,

Sediyama³

et al. 2007

Hortic. Bras.

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Avaliou-se o efeito de critérios baseados na análise do teor de nitrato no solo, na produtividade esperada de frutos e em resultados de experimentos anteriores para a recomendação da dose de fertilizante nitrogenado a ser aplicada no tomateiro em ambiente protegido. Dois experimentos foram conduzidos em casa de vegetação, sendo um em solo previamente lixiviado com água (Experimento 1) e outro sem lixiviação (Experimento 2), a fim de simular condições de alto e baixo teor inicial de nitrato no solo. Seis tratamentos foram avaliados no delineamento de blocos ao acaso, com quatro repetições. Os tratamentos foram baseados nos critérios: 1) produtividade esperada de frutos e contribuições do solo e do fertilizante (PESF); 2) quantidade esperada de N no fruto e contribuição do solo (QECS); 3) quantidade esperada de N no fruto (QEFR); 4) dose recomendada experimentalmente de 280 kg ha-1 de N, aplicada parceladamente via gotejamento, em cobertura a cada 14 dias (DRCO); 5) mesma dose utilizada no tratamento anterior, mas aplicada em dose total no momento do transplante (DRTR); 6) não aplicação de fertilizante nitrogenado (TEST). As doses variaram de 0 a 570,8 kg ha-1 de N, dependendo do tratamento. Em ambos os experimentos as produções total e comercial de frutos não diferiram significativamente entre os tratamentos que receberam N. Maiores produções foram obtidas pela utilização do critério PESF. De forma geral, as eficiências de uso, de utilização e agronômica do N diminuíram à medida que a quantidade de N aplicada aumentou nos dois experimentos. Os critérios PESF e DRTR proporcionaram maior produtividade e eficiência na recuperação do N derivado do fertilizante.

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Section: Introductionunclassified

Critérios para a determinação da dose de nitrogênio a ser aplicada no tomateiro em ambiente protegido

Araújo

Fontes²,

Sediyama³

et al. 2007

Hortic. Bras.

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“…In temperate regions, carrot yields are often unaffected by preplant and sidedress N application (Hamilton and Bernier 1975;Burdine and Hall 1976;Venter 1979;Wiebe 1987;Evers 1988;Rühlmann and Geyer 1993;Warncke 1996;Sanderson and Ivany 1997;Gutezeit 1999;Couper 2001;Westerveld 2002). The reasons for the lack of yield effect have not been extensively studied, but high mineralization rates in temperate soils (Gutezeit 1999;Zebarth et al 2004) and deep and extensive rooting (Pietola and Smucker 1998; Thorup-Kristensen and van den Boogaard 1999) are possible causes.…”

Section: Mots Clésmentioning

confidence: 99%

Distribution of nitrogen uptake, fibrous roots and nitrogen in the soil profile for fresh-market and processing carrot cultivars

Westerveld¹,

McKeown²,

McDonald³

2006

Can. J. Plant Sci.

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. 2006. Distribution of nitrogen uptake, fibrous roots and nitrogen in the soil profile for fresh-market and processing carrots. Can. J. Plant. Sci 86: 1227-1237. In temperate regions, yield of carrot [Daucus carota subsp. sativus (Hoffm.) Arkang.] is not generally affected by preplant applications of nitrogen (N). Previous studies speculate that carrots utilize N from much deeper in the soil profile than other crops. Carrot (cvs. Idaho and Fontana) were grown on organic and mineral soil in Ontario over a 3-yr period to determine rooting and N-uptake dynamics. Nitrogen application rates ranged from 0 to 200% of Ontario recommendations for each soil type. Soil samples collected at seeding and harvest at three depths were assessed for total N, nitrate-N and ammonium-N. The same cultivars were grown in 150-cm-deep PVC pipes filled with silica sand or soilless mix to assess root distribution and N uptake. Potassium nitrate fertilizer enriched with 15 N was applied at three depths in the pipes and plants were assessed 28 d later for fertilizer N recovery. In the field, the highest N concentration both at seeding and at harvest was in the top 30 cm of the soil profile, but a significant pool of N was available at the 30-60 and 60-90 cm depths. In the pipes, up to 55% of the roots were below 30 cm depth, and these roots assimilated as much N as shallow roots. There were no differences between the cultivars in root distribution or timing of N uptake. Soil N at depths below 30 cm is available to carrots and contributes to plant growth. Soil sampling for N in the 30-60 cm depth is necessary for the determination of N fertilizer requirements.

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“…Large nitrate concentration in soil tends to improve shoot: root ratio (RaynalLacroix, 1994). Great variation in nitrogen uptake may be related to different climatic conditions, soil type, nutrient concentration, and well-developed root system which enable the plants to absorb nitrogen efficiently from the soil (Warncke, 1996). About 85 -90% of nitrogen is absorbed by carrot during the growth stage of plant; while in the first and last quarter of its growth only 10 -15% of nitrogen is absorbed (Raynal-Lacroix, 1994).…”

Section: Introductionmentioning

confidence: 99%

“…Carrot demand for additional nitrogen fertilizer varies between 0-110 kg/ha (Salo, 1996;Warncke, 1996;Raynal-Lacroix, 1994). Nitrogen application above 110 kg/ha decreases the yield (Bishop, 1973) and quality due to root cracking (Balvoll, 1995).…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen on the Growth and Yield of Carrot (Daucus carota L.)

et al. 2013

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An experiment was carried out at farmer's field in Debigonj, Panchagorh during November 2009 to February 2010 to evaluate the effect of four levels of applied nitrogen on the growth and yield of carrot. The experiment was laid out in a Randomized Complete Block Design with three replications. The maximum plant height (47.36 cm), root length (16.17 cm), fresh weight of leaves (145.1 g), dry matter content (11.66 g) of leaves, fresh weight of root (68.33 g), dry matter content of root (15.90%), gross yield (22.55 t/ha) and marketable yield (20.67 t/ha) were found in 100 kg N/ha.

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Soil and plant tissue testing for nitrogen management in carrots

Cited by 27 publications

References 10 publications

Critérios para a determinação da dose de nitrogênio a ser aplicada no tomateiro em ambiente protegido

Critérios para a determinação da dose de nitrogênio a ser aplicada no tomateiro em ambiente protegido

Distribution of nitrogen uptake, fibrous roots and nitrogen in the soil profile for fresh-market and processing carrot cultivars

Effect of Nitrogen on the Growth and Yield of Carrot (Daucus carota L.)

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