Development, growth and chemical composition of the potato crop (Solanum tuberosum L.). I. leaf and stem

Kolbe, Hartmut; Stephan-Beckmann, Sabine

doi:10.1007/bf02407567

Cited by 48 publications

(26 citation statements)

References 66 publications

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“…Nos países da Europa e nos Estados Unidos, a dose de N recomendada varia de 70 a 330 kg ha -1 , com ciclo de cultivo em torno de cinco meses (Kolbe & Beckmann, 1997), e, no Canadá, de 165 a 215 kg ha -1 (Zebarth et al, 2004). No Brasil, é possível encontrar recomendações de fertilização variando de 60 a 250 kg ha -1 de N (Fontes, 1999).…”

Section: Resultsunclassified

Dose de nitrogênio associada à produtividade de batata e índices do estado de nitrogênio na folha

Coelho

Fontes

Puiatti

et al. 2010

Rev. Bras. Ciênc. Solo

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RESUMOO nitrogênio é um dos elementos de grande impacto na produtividade da batata, e seu efeito nas plantas pode ser avaliado por meio de técnicas de diagnóstico do estado nutricional. Este trabalho teve o objetivo de determinar a dose ótima econômica de N para a produção de tubérculos e estimar o nível crítico de índices do estado de N na folha de duas cultivares de batata. O experimento foi conduzido de maio a agosto de 2008, em delineamento em blocos ao acaso em esquema fatorial 4 x 2, sendo quatro doses de N (0, 100, 200 e 400 kg ha -1 de N, aplicadas em pré-plantio como ureia) e duas cultivares de batata (Ágata e Asterix), com quatro repetições. Aos 21 dias após a emergência foram determinadas a leitura SPAD e os teores de N e de clorofila na quarta folha a partir do ápice (QF). A produtividade de tubérculos comerciais aumentou até 45.065 e 46.500 kg ha -1 com o aumento da dose de N até 297 e 250 kg ha -1 para Ágata e Asterix, respectivamente. Para essas cultivares, a dose para obtenção da máxima eficiência econômica foi de 290 e 245 kg ha -1 de N, respectivamente. Nas duas cultivares, houve efeito positivo de doses de N sobre o índice SPAD e teores de N e de clorofila na QF. Os valores críticos foram de 40,5 e 43,7 para o índice SPAD, de 66,7 e 75,2 g kg -1 para o teor foliar de N e de 6,13 e 6,96 mg g -1 para o teor de clorofila total na matéria fresca das folhas, respectivamente, para Ágata e Asterix. Os valores da leitura do índice SPAD correlacionaram-se com os valores de clorofila total extraível na quarta (1) Recebido para publicação em maio de 2009 e aprovado em abril de 2010.

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Section: Resultsunclassified

Dose de nitrogênio associada à produtividade de batata e índices do estado de nitrogênio na folha

Coelho

Fontes

Puiatti

et al. 2010

Rev. Bras. Ciênc. Solo

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“…In potato plants, the greatest above-ground growth occurs 30-45 days after emergence (Kolbe & Stephan-Beckmann 1997a). This is also the period of maximum uptake of water and nutrients, in which more than 40% of total nitrogen uptake occurs.…”

Section: Root Growth In Potatomentioning

confidence: 99%

Root development in potato and carrot crops – influences of soil compaction

Johansen

Thomsen

Løes

et al. 2014

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

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Row crops such as potatoes (Solanum tuberosum L.) and carrots (Daucus carota L.) are of high economic value in the Nordic countries. Their production is becoming more and more specialized, including continuous arable cropping and heavier farm machinery, with increased risk of soil compaction. The result may be restricted root development and economic losses. Potatoes have widely branched adventitious roots, whereas carrots have taproots with fibrous roots extending from them. Under optimal soil conditions, total root length per surface area may reach more than 10 km m −2 for both species. Maximal root depth is about 140 cm for potato and more than 200 cm in carrots. Most of the root mass is usually distributed within the upper 100 cm, whereof more than 50% may be deeper than 30 cm. Soil compaction causes a dense soil with few large pores, poor drainage and reduced aeration, especially in wet soils with low organic matter content and high proportions of silt or clay. With compacted subsoil layers, roots will be concentrated more in the upper layers and thus explore a smaller soil volume. This will lead to reduced water and nutrient uptake, reduced yields and low nutrient utilization efficiency. In this review article, we describe the interactions between root development and soil conditions for potatoes and carrots, with special focus on sub-optimal conditions caused by soil compaction. We also discuss the effects of tilling strategies, organic material, irrigation and fertilization strategies and controlled traffic systems on root and yield development. To reduce subsoil compaction there is a need to implement practises such as controlled traffic farming, new techniques for ploughing, better timing of soil operations, crop rotations with more perennial crops and supplements of organic material. Moreover, there is a need for a stronger focus on the impacts of farm machinery dimensions.

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“…N fertilization rate effects on the weight of classes 2 and 3 tubers were dependent upon the cultivar, and no N effect was found on the numbers of classes 2 and 3 tubers, except for class 2 of Ágata which increased following a quadratic model. In some European countries and the USA, with a growth cycle of 4 to 5 months, the recommended N fertilization rates vary from 70 to 330 kg ha −1 (Kolbe and Beckmann 1997) and in Canada from 165 to 215 kg ha −1 (Zebarth et al 2004). For the maximum marketable yield, N fertilization rates ranged between 151 and 250 kg ha −1 (Bélanger et al 2000a).…”

Section: Total and Marketable Tuber Yieldmentioning

confidence: 99%

Economic Optimum Nitrogen Fertilization Rates and Nitrogen Fertilization Rate Effects on Tuber Characteristics of Potato Cultivars

Fontes

Braun

Busato³

et al. 2010

Potato Res.

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The objective of the research was to determine the economic optimum nitrogen (N) fertilization rates and to determine the effects of N fertilization rates on tuber characteristics and fresh mass loss after storage under cold and ambient conditions of four potato cultivars, Ágata, Asterix, Atlantic, and Monalisa. The experiments were, simultaneously, conducted in the same area and similar experimental conditions during the fall/winter period in Viçosa, Minas Gerais State, Brazil. In each experiment, five N fertilization rates (0, 50, 100, 200, 300 kg ha −1 ) were evaluated in a randomized complete block design. For all cultivars, increasing N fertilization rate increased total and marketable yields and tuber dry matter yield up to a maximum following a quadratic model. Increasing N fertilization rate linearly increased the tuber protein concentration of Atlantic and Monalisa and had no effect on tuber pH. N fertilization rate effects on tuber mass, tuber titratable acidity, and fresh mass loss during storage were cultivar-dependent. N use efficiency (tuber yield divided by N fertilization rate) decreased with increase in N fertilization rate. The economic optimum N fertilization rates ranged from 147 to 201 kg ha −1 depending upon cultivar and relative prices of N and potato tubers. Depending on the cultivar, under favorable price conditions (low N price and high tuber price), the economic optimum N fertilization rates to be applied by potato growers were 92-95% of the estimated N fertilization rate for obtaining the maximum potato yield, whereas under unfavorable conditions (high N price and low potato tuber price) the economic optimum N fertilization rates to be applied should be decreased to 86-92% of the rates for maximum yield.

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Development, growth and chemical composition of the potato crop (Solanum tuberosum L.). I. leaf and stem

Cited by 48 publications

References 66 publications

Dose de nitrogênio associada à produtividade de batata e índices do estado de nitrogênio na folha

Dose de nitrogênio associada à produtividade de batata e índices do estado de nitrogênio na folha

Root development in potato and carrot crops – influences of soil compaction

Economic Optimum Nitrogen Fertilization Rates and Nitrogen Fertilization Rate Effects on Tuber Characteristics of Potato Cultivars

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