Calculation of the total nitrate uptake of lettuce (<i>Lactuca sativa</i> L.) by use of a mathematical model to simulate nitrate inflow

Steingrobe, Bernd

doi:10.1002/jpln.19971600113

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…As a consequence, with or without N fertilization, corrected influx of HATS (see "Materials and Methods") already operates at its maximum required influx to satisfy the N demand at a given developmental stage under particular environmental conditions. This conclusion is in close agreement with results from the lettuce nitrate uptake model of Steingrobe and Schenk (1997). Moreover, it has been shown that N uptake by HATS was limited by the soil N supply when soil N limitation was included (Fig.…”

Section: Modeling Of N Uptake By An Oilseed Rape Cropsupporting

confidence: 91%

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Malagoli¹,

Laîné²,

Deunff³

et al. 2004

Plant Physiology

115

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The use of kinetic equations of NO 3 Ϫ transport systems in oilseed rape (Brassica napus), determined by 15 NO 3 Ϫ labeling under controlled conditions, combined with experimental field data from the INRA-Châlons rape database were used to model NO 3 Ϫ uptake during the plant growth cycle. The quantitative effects of different factors such as day/night cycle, ontogenetic stages, root temperature, photosynthetically active radiation, and soil nitrate availability on different components of the constitutive high-affinity transport systems, constitutive low-affinity transport systems, inducible low-affinity transport systems, and inducible high-affinity transport systems of nitrate were then determined to improve the model's predictions. Simulated uptake correlated well with measured values of nitrogen (N) uptake under field conditions for all N fertilization rates tested. Model outputs showed that the high-affinity transport system accounted for about 89% of total NO 3 Ϫ uptake (18% and 71% for constitutive high-affinity transport systems and inducible high-affinity transport systems, respectively) when no fertilizer was applied. The low-affinity transport system accounted for a minor proportion of total N uptake, and its activity was restricted to the early phase of the growth cycle. However, N fertilization in spring increased the duration of its contribution to total N uptake. Overall, data show that this mechanistic and environmentally regulated approach is a powerful means to simulate total N uptake in the field with the advantage of taking both physiologically regulated processes at the overall plant level and specific nitrate transport system characteristics into account.Winter oilseed rape (Brassica napus) is an important crop in northern Europe because of its varied utilizations (oil and biofuel). However, yields remain highly variable. As a consequence, oilseed rape has been extensively studied to identify key components of yield and to improve them by more effective nitrogen (N) application with the target of reducing environmental impacts such as N leaching and improving N use efficiency for seed filling (Boelcke et al., 1991;Habekotté, 1993;Schjoerring et al., 1995;Sieling and Christen, 1997;Vos and van der Putten, 1997). Many mathematical models have been built to simulate crop growth, development, and yield (BRASNAP-PH, Habekotté, 1997a; and LINTUL BRASNAP, Habekotté, 1997b). Some of these (DAISY, Petersen et al., 1995; and CERES-Rape, Gabrielle et al., 1998) have been devoted mainly to predicting ecological impacts of N losses from winter oilseed rape. When N nutrition has been taken into account, N uptake usually has been based on the balance of demand and supply. In this context, N availability in the soil solution is modeled using mass flow and NO 3 Ϫ diffusion equations (CERES-Rape, and DAISY), and N demand is often determined using the critical dilution curve determined by Colnenne et al. (1998) for oilseed rape (CERES-rape). In these models, the root system is considered as a "black box." ...

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Section: Modeling Of N Uptake By An Oilseed Rape Cropsupporting

confidence: 91%

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Malagoli¹,

Laîné²,

Deunff³

et al. 2004

Plant Physiology

115

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Simulation and assessment of the nitrogen cycle in a constant-head, one pump (CHOP) aquaponics system

Pamintuan

Doma

2019

IOP Conf. Ser.: Earth Environ. Sci.

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Aquaponics, or the co-culture of fish and plants, has been widely regarded as a solution to the growing food requirement of an increasingly urban landscape. However, difficulties in scaling up arise particularly for start-up growers due to the lack of reliable models to describe the nutrient balance in an aquaponics set-up. In this study, a comprehensive model for the products of the nitrogen cycle is presented in a constant-head one pump (CHOP) aquaponics assembly in order to have a picture of their concentrations in the system, thereby eliminating expensive trial and error adjustments. The growth rate and rate of waste generation of Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758) was mathematically represented alongside the growth rate and rate of nitrogen assimilation of lettuce (Lactuca sativa L.). The evolution of nitrifying bacteria in the biofilter was also modelled. The condition of high recirculation rates was assumed to eliminate the spatial variation of concentration in small-volume modular tanks. The results of the simulation suggest that a linear propagation of both fish and plant through time will result to a deficiency of nutrients for the plants in the beginning of the fish growing cycle, and an excess of nitrates towards the end. To manage rising nitrate levels, the adoption of a staggered growing system was suggested instead of changing water. Overall, the developed model performed satisfactorily in providing a reference to the grower, and is hoped to be extended to other nutrients as well in the future.

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Calculation of the total nitrate uptake of lettuce (Lactuca sativa L.) by use of a mathematical model to simulate nitrate inflow

Cited by 2 publications

References 21 publications

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Modeling Nitrogen Uptake in Oilseed Rape cv Capitol during a Growth Cycle Using Influx Kinetics of Root Nitrate Transport Systems and Field Experimental Data

Simulation and assessment of the nitrogen cycle in a constant-head, one pump (CHOP) aquaponics system

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