Skip to main content
Vai all'homepage della Commissione europea (si apre in una nuova finestra)
italiano it
CORDIS - Risultati della ricerca dell’UE
CORDIS
Contenuto archiviato il 2024-05-07

Optimal control of nitrate accumulation in greenhouse lettuce and other leafy vegetables

Obiettivo

Summary of the proposed NICOLET project High concentrations of nitrate in leafy vegetables such as lettuce constitute a health hazard. Out of concern for consumer safety, the EC issued a directive (194/97), defining maximum levels for nitrate in fresh vegetables, including lettuce and spinach. At present, low light levels in winter often make it difficult for growers to meet the required standard. A generally applicable method, incorporating both accurate control of the internal nitrate concentra- tion and an optimal production management strategy, is as yet not available. The aim of this project is to establish cultivation methods for accurate control of nitrate accumulation in leafy vegetables. The nitrate concentration in lettuce is negatively correlated with the level of soluble sugars. Thus, increased sugar concentrations, associated with stimulated photosynthesis at higher light levels, lead to lower nitrate concentrations in lettuce. The proposed project is based on the hypothesis that several different environmental factors can be manipulated to control the nitrate concentration in the crop. This is based on the understanding that the level of soluble sugars in plants is determined by the balance between carbohydrate supply (photosynthesis, mobilization) and demand (growth, respiration, storage), rather than by photosynthesis alone. A preliminary mathematical model based on this hypothesis was formulated, which was already able to simulate published results of seasonal effects on the nitrate concentration in lettuce with reasonable accuracy. A fully developed version can find practical application as a crop management tool, advising the grower about the effects of variable weather conditions on crop nitrate accumulation and predicting effects of adjustments in greenhouse climate settings and fertigation scheme. In addition, optimal cultivation management strategies can be calculated on the basis of model predictions, which will help growers to achieve the best possible result within the limits of Community regulations on nitrate in vegetables, without requiring large investments. Application of more elaborate versions, involving on-line control of both root and shoot environment, should result in a considerably enhanced degree of control of the cultivation process. In the proposed project, we envisage to elaborate and expand on a novel and encouraging preliminary line of research. In the initial stages, the project will concentrate on validation and sensitivity analysis of the preliminary model, as well as experimentation to establish time constants for the dominant physiological processes. Besides, additional methods to decrease nitrate accumulation will be tested. Depending on the outcome of the experimental research, there may be a need to add detail to the model. In addition, different modules will be developed to enhance the model, enabling it to predict the effects of various specific environmental disturbances. In parallel with the development of the model, optimal control scenarios will be calculated and tested, both for off-line and on-line applications of the model.

Campo scientifico (EuroSciVoc)

CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP. Cfr.: Il Vocabolario Scientifico Europeo.

È necessario effettuare l’accesso o registrarsi per utilizzare questa funzione

Argomento(i)

Gli inviti a presentare proposte sono suddivisi per argomenti. Un argomento definisce un’area o un tema specifico per il quale i candidati possono presentare proposte. La descrizione di un argomento comprende il suo ambito specifico e l’impatto previsto del progetto finanziato.

Invito a presentare proposte

Procedura per invitare i candidati a presentare proposte di progetti, con l’obiettivo di ricevere finanziamenti dall’UE.

Dati non disponibili

Meccanismo di finanziamento

Meccanismo di finanziamento (o «Tipo di azione») all’interno di un programma con caratteristiche comuni. Specifica: l’ambito di ciò che viene finanziato; il tasso di rimborso; i criteri di valutazione specifici per qualificarsi per il finanziamento; l’uso di forme semplificate di costi come gli importi forfettari.

CSC - Cost-sharing contracts

Coordinatore

RESEARCH STATION FOR FLORICULTURE AND GLASSHOUSE VEGETABLES
Contributo UE
Nessun dato
Indirizzo
Linnaeuslaan 2a
1431 AALSMEER
Paesi Bassi

Mostra sulla mappa

Costo totale

I costi totali sostenuti dall’organizzazione per partecipare al progetto, compresi i costi diretti e indiretti. Questo importo è un sottoinsieme del bilancio complessivo del progetto.

Nessun dato

Partecipanti (3)

Il mio fascicolo 0 0