Nitrogen Accumulation and Growth of Fruiting Tomato Plants in Hydroponics

Bellert, C.; Bot, Jacques Le; Dorais, Martine; López, Javier Rodríguez; Gosselin, André

doi:10.17660/actahortic.1998.458.37

Cited by 16 publications

(7 citation statements)

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“…At 1.90 mmol l −1 S concentration 63 branches developed, which was significantly more than at other concentrations. However, the foliar fresh mass production was not significantly affected by S. The non-significant results on foliar fresh mass obtained in this study confirmed results obtained on tomatoes by Bellert et al (1998).…”

Section: Study Of the Effect Of Sulphur On Yield And Quality Of Rose supporting

confidence: 87%

Yield and quality response of rose geranium (Pelargonium graveolensL.) to sulphur and phosphorus application

Sedibe

Allemann

2012

South African Journal of Plant and Soil

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Sulphur and phosphorus are essential plant macronutrients. Sulphur is involved in the formation of chlorophyll, activation of enzymes and is part of coenzyme A. Phosphorus forms part of the structure of nucleic acids and phospholipids. Two separate studies were conducted to determine the effects of sulphur and phosphorus levels in nutrient solutions on yield and quality of hydroponically grown rose geranium as well as setting standards of sulphur and phosphorus amounts to be used in the production process. The effect of four levels of sulphur (0.36, 1.90, 3.44 and 4.98 mmol l −1) was investigated in the first study and in the second study four levels of phosphorus (0.1, 0.8, 1.5 and 2.2 mmol l −1) were also investigated. All treatments were assigned in a completely randomised block design with five replicates. The results of the first study showed a significant effect of sulphur on the number of branches, plant height and foliar fresh mass. Foliar fresh mass and oil yield peaked at the 3.44 mmol l −1 concentration. The second study showed that plant height and the number of branches was not affected significantly by phosphorus, but foliar mineral phosphorus, magnesium and potassium were affected. Oil yield of rose geranium increased linearly with increased phosphorus concentrations. Both the guaia-69-diene content and the citronellol:geraniol ratio were greater at the highest phosphorus level, which indicated that oil quality can be enhanced by using relatively high phosphorus concentrations in nutrient solutions.

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Section: Study Of the Effect Of Sulphur On Yield And Quality Of Rose supporting

confidence: 87%

Yield and quality response of rose geranium (Pelargonium graveolensL.) to sulphur and phosphorus application

Sedibe

Allemann

2012

South African Journal of Plant and Soil

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“…A similar observation was made in NFT-grown tomatoes subjected either to different fruit loads (i.e. 1 or 4 fruits per truss) or different air water vapour pressure deficits [3]. However, due to various experimental difficulties, soilless-grown crops lack trials whereby growth is impaired by the regime of N fertilisation and so far no data characterises the dynamics of %N c decline in tomato.…”

Section: Discussionsupporting

confidence: 57%

Impacts of N-deprivation on the yield and nitrogen budget of rockwool grown tomatoes

Bot¹,

Jeannequin²,

Fabre³

2001

Agronomie

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An experiment is related in which well-fed tomato plants, grown within a rockwool tomato culture, were suddenly nourished with a nitrogen-free nutrient solution. For 6 weeks, control (+N) and treated (-N) plants were regularly harvested and analysed in order to determine the impact of the treatment on growth, yield and N composition of several organs. After 6 weeks of the treatment,-N plants had accumulated ca. 20% less dry biomass, mainly because of a reduced vegetative growth. Commercial fruit yield was slightly less affected by N-withdrawal, being decreased by 17%.-N plants invested less N than C in the growth of young fruits, leading to %N decrease in their dry biomass. N movements, mainly feeding fruits, have been characterised. In control plants, the efficiency of N-fertiliser use was low (46%) indicating important nitrate wastage in the drainage (> 1000 kg N⋅ha-1), harmful to the environment. Lycopersicon esculentum / critical N / environment / model / deficiency Résumé-Impacts d'une privation d'azote sur le rendement et le bilan azoté d'une culture de tomate sur laine de roche. Une privation d'azote a été pratiquée sur un lot de plantes au cours d'une culture de tomates sous serre. Pendant 6 semaines, des plants témoins et privés d'azote ont été prélevés et analysés pour determiner l'impact du traitement sur la croissance, le rendement et la composition des organes. Chez les plantes-N, on a observé 20 % d'accumulation de MS en moins après 6 semaine de traitement, majoritairement dus à une faible croissance végétative. Le rendement en fruits récoltés a lui aussi été affecté (-17 %). Pendant la privation, la plante a investi moins d'azote que de carbone dans la construction des jeunes fruits, impliquant une teneur moindre en azote. Des mouvements d'azote ont été caractérisés dans la plante, essentiellement vers les fruits. Chez les plantes +N, on a déterminé au cours du cycle cultural, un faible coefficient d'interception de l'engrais azoté (0,46), signifiant un fort rejet d'azote dans les drainages (>1000 kg⋅N ha-1), préjudiciable à l'environnement.

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“…plant development, light intensity, temperature) (Le . Nutrient demand is calculated for each organ as the product of dry weight growth and maximum nutrient concentration as described by several authors (Mankin and Fynn, 1996;Kläring et al, 1997;Bellert et al, 1998;Marcelis et al, 2005). The maximum nutrient concentration is the concentration that is reached when nutrient availability is not limiting.…”

Section: Water and Nutrient Uptakementioning

confidence: 99%

Simulating Growth and Development of Tomato Crop

Marcelis¹,

Elings²,

Visser³

et al. 2009

Acta Hortic.

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Crop models are powerful tools to test hypotheses, synthesize and convey knowledge, describe and understand complex systems and compare different scenarios. Models may be used for prediction and planning of production, in decision support systems and control of the greenhouse climate, water supply and nutrient supply. The mechanistic simulation of tomato crop growth and development is described in this paper. The main processes determining yield, growth, development and water and nutrient uptake of a tomato crop are discussed in relation to growth conditions and crop management. Organ initiation is simulated as a function of temperature. Simulation of leaf area expansion is also based on temperature, unless a maximum specific leaf area is reached. Leaf area is an important determinant for the light interception of the canopy. Radiation shows exponential extinction with depth in the canopy. For leaf photosynthesis several models are available. Transpiration is calculated according to the Penman-Monteith approach. Net assimilate production is calculated as the difference between canopy gross photosynthesis and maintenance respiration. The net assimilate production is used for growth of the different plant organs and growth respiration. Partitioning of assimilates among plant organs is simulated based on the relative sink strengths of the organs. The simulation of plant-nutrient relationships starts with the calculation of the demanded concentrations of different macronutrients for each plant organ with the demand depending on the ontogenetic stage of the organ. Subsequently, the demanded nutrient uptake is calculated from these demanded concentrations and dry weight of the organs. When there is no limitation in the availability at the root surface, the actual uptake will equal the demanded uptake. When the root system cannot fulfil the demand, uptake is less, plant nutrient concentration drops and crop production might be reduced. It is concluded that mechanistic crop models accurately simulate yield, growth, development and water and nutrient relations of greenhouse grown tomato in different climate zones.

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Nitrogen Accumulation and Growth of Fruiting Tomato Plants in Hydroponics

Cited by 16 publications

References 0 publications

Yield and quality response of rose geranium (Pelargonium graveolensL.) to sulphur and phosphorus application

Yield and quality response of rose geranium (Pelargonium graveolensL.) to sulphur and phosphorus application

Impacts of N-deprivation on the yield and nitrogen budget of rockwool grown tomatoes

Simulating Growth and Development of Tomato Crop

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