Relation entre dynamique de croissance et dynamique de prélèvement d'azote pour un peuplement de graminées fourragères. I. — Etude de l'effet du milieu

Lemaire, G.; Salette, J.; Sigogne, Monique; Terrasson, Jean-Pierre

doi:10.1051/agro:19840503

Cited by 254 publications

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“…In an experiment using five nutrient levels, Rattin (2000) found a set of five dilution curves, corresponding to each one of the five nutrition levels being compared. As described by Lemaire et al (1997), the dilution of N during the growth of the plant could be explained by the simultaneous effect of an increased fraction of dry matter being allocated to storage organs like fruits, and the competition for light among leaves in different positions of the canopy becoming more intense as a consequence of leaf area growth. Thus, N is remobilized from lower leaves to higher and more illuminated ones, decreasing the N concentration in the shoot.…”

Section: Resultsmentioning

confidence: 98%

“…As a consequence, when harvested, these leaves were always at physiological stages before senescence. Thus, physiological causes that could explain N dilution seem quite different of those pointed out for C3 and C4 annual crops (Greenwood et al, 1990;1991;Lemaire et al, 1997). In the tomato plant, Heuvelink (1995) suggested a common pool of assimilates, the distribution among organs being regulated by sink strength, independently of the position of each organ on the plant.…”

Section: Resultsmentioning

confidence: 99%

“…The critical N dilution curve could be used to estimate the N status of the plant at any stage of plant growth period, by means of a nitrogen nutrition index (NNI), as follows (Lemaire et al, 1997):…”

Section: (Recebido Para Publicação Em 22 De Agosto De 2001 E Aceito Ementioning

confidence: 99%

“…Models have been suggested to adjust the offer to the demand of nutrients for several crops, based mainly in relations between plant nutrient concentration and growth (Ulrich, 1952); Burns, 1992;Lemaire & Denoix, 1987;Grindlay et al, 1993;Lemaire et al, 1997;Greenwood et al, 1990Greenwood et al, , 1991Greenwood & Stone, 1998;Rahn, 1997;Robinson, 1997;Le Bot et al, 1997;Colnenne et al, 1998). For nitrogen, Caloin & Yu (1984) and Hardwick (1987) described the dynamics of plant growth as a consequence of the functional equilibrium between growth of a vegetative and a structural compartment.…”

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confidence: 99%

“…For nitrogen, Caloin & Yu (1984) and Hardwick (1987) described the dynamics of plant growth as a consequence of the functional equilibrium between growth of a vegetative and a structural compartment. The critical N concentration in the plant at any stage during its ontogeny was defined as the minimum plant N% necessary to achieve the maximum growth rate of the crop, and was represented by a power equation as follows (Lemaire et al, 1997;Justes et al, 1997):…”

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Nitrogen concentration in dry matter of the fifth leaf during growth of greenhouse tomato plants

2002

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The nitrogen concentration in dry matter of the fifth leaf during growth of a greenhouse tomato crop was determined. Plants of hybrid Monte Carlo were grown in 4.5 L bags, using a commercial substrate, in a plant density of 3.3 plants m-2. A nutrient solution containing, in mmol L-1: KNO3, 4.0; K2SO4, 0.9; Ca(NO3)2, 3.75; KH2PO4, 1.5; MgSO4, 1.0; iron chelate 19. 10³, was used as reference. Microelements were added by a commercial mixture. The T3 treatment was equal to the reference nutrient solution, whereas in treatments T1, T2, T4 and T5 quantities of all nutrients from T3 were multiplied by 0.25, 0.50, 1.25 and 1.50, respectively. In each treatment, the volume of 1 L of nutrient solution was supplied to each plant once a week by fertigation. Periodically destructive measurements were made from anthesis to ripening of the first truss, to determine dry matter and N concentration in shoot and in fifth leaf tissues, counted from the apex to the bottom of the plant. Five dilution curves were fitted from data of N concentration in the fifth leaf and shoot dry matter accumulation during growth of plants. A general relationship was adjusted between actual N concentration in shoot (Nt) and in the fifth leaf (Nf): Nt = 1.287 Nf (R² = 0.80). This relationship could be used to estimate the N status of plants by means of a nitrogen nutrition index (NNI), from analysis of the fifth leaf sap.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: (Recebido Para Publicação Em 22 De Agosto De 2001 E Aceito Ementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Nitrogen concentration in dry matter of the fifth leaf during growth of greenhouse tomato plants

2002

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Improving Crop Nitrogen Use in Dryland Farming

Garnett¹,

Rebetzke²

2013

Improving Water and Nutrient‐Use Efficiency in Food Production Systems

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Effect of slow‐release nitrogen on the nitrogen availability in an andisol and the critical nitrogen concentration in wheat

Clunes

Pinochet

2020

Agronomy Journal

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The use of coated fertilizers and the concept of the critical N dilution curve are alternatives capable of improving the production efficiency of wheat (Triticum aestivum L.) crops in agro-ecosystems. The objectives of this work were to evaluate the effect of a slow release urea-coated fertilizer on (i) the production of wheat's shoot biomass at the anthesis stage, (ii) the concentration of N in the shoot biomass, and (iii) the N availability in the Andisol. Two fertilizers: urea and urea-coated were evaluated using four increasing N rates and a control treatment (without fertilization), in three application strategies, during two growing seasons (late sowing [S1] and early sowing [S2]). Samples of shoot biomass and soil (0-20-cm depths) were collected at five wheat growth stages (Z21, Z31, Z39, Z45, Z69 on the Zadoks scale). The average production of shoot biomass was 10.3 t dry matter (DM) ha -1 for S2 and 7.9 t DM ha -1 for S1 and N concentrations was between 1.0-3.0%. When using a coated urea fertilizer in this Valdivian agro-ecosystem, no statistical differences (P < .05) in shoot biomass or wheat N concentrations were found at anthesis (Z69). Differences were principally between seasons. We therefore proposed a new adjustment to the dilution N curve, with a value concentration critical, N c start of 3.80%, and 4.15%, for S1 and S2, respectively. Use demand parameters such as N c adjusted to the agro-ecosystem for wheat crop, allows to rationalize the fertilization according to inorganic N available from the soil.Abbreviations: AS, all of the fertilizer was applied at sowing; AT, all of the fertilizer was applied at the end of tillering; CU, Nutrisphere-Urea; DM, dry matter; GDD, growing degree days; N c , critical nitrogen concentration; NNI, nitrogen nutrition index; S1, season 1; S2, season 2; SA, split application with one-third applied at sowing and two-thirds at the end of tillering; U, urea.

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Relation entre dynamique de croissance et dynamique de prélèvement d'azote pour un peuplement de graminées fourragères. I. — Etude de l'effet du milieu

Abstract: Relation entre dynamique de croissance et dynamique de prélèvement d'azote pour un peuplement de graminées fourragères. I. — Etude de l'effet du milieu

Cited by 254 publications

References 0 publications

Nitrogen concentration in dry matter of the fifth leaf during growth of greenhouse tomato plants

Nitrogen concentration in dry matter of the fifth leaf during growth of greenhouse tomato plants

Improving Crop Nitrogen Use in Dryland Farming

Effect of slow‐release nitrogen on the nitrogen availability in an andisol and the critical nitrogen concentration in wheat

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