Wild edible plants have been used in cooking since ancient times. Recently, their value has improved as a result of the scientific evidence for their nutraceutical properties. Sanguisorba minor Scop. (salad burnet) plants were...
moreWild edible plants have been used in cooking since ancient times. Recently, their value has improved as a result of the scientific evidence for their nutraceutical properties. Sanguisorba minor Scop. (salad burnet) plants were hydroponically grown and two consecutive cuts took place at 15 (C1) and 30 (C2) days after sowing. An untargeted metabolomics approach was utilized to fingerprint phenolics and other health-related compounds in this species; this approach revealed the different effects of the two cuts on the plant. S. minor showed a different and complex secondary metabolite profile, which was influenced by the cut. In fact, flavonoids increased in leaves obtained from C2, especially flavones. However, other secondary metabolites were downregulated in leaves from C2 compared to those detected in leaves from C1, as evidenced by the combination of the variable important in projections (VIP score > 1.3) and the fold-change (FC > 2). The storage of S. minor leaves for 15 day...
The article presents a number of empirical models for predicting the macronutrient uptake of melon plants grown in nutrient film technique under environmental conditions of plastic greenhouse in the Mediterranean region. Models were...
moreThe article presents a number of empirical models for predicting the macronutrient uptake of melon plants grown in nutrient film technique under environmental conditions of plastic greenhouse in the Mediterranean region. Models were developed according to two statistical procedures: stepwise multiple regression (MR) and canonical correlation (CC). Independent variables considered by the modeling were global radiation and air temperature in
Abstract: Rocket is an important leafy vegetable in Mediterranean countries and is mainly used to flavor salads. Soil grown rocket usually contains high level of nitrate about 7000-8000 mg kg-1 (ppm) and during the winter period this...
moreAbstract: Rocket is an important leafy vegetable in Mediterranean countries and is mainly used to flavor salads. Soil grown rocket usually contains high level of nitrate about 7000-8000 mg kg-1 (ppm) and during the winter period this value can easily overcome 9000 ppm. Rocket was used in our experiments as a model system for studying new technologies for reducing nitrate content in preharvest and postharvest stages. Experiments carried out as pre-harvest strategies were focused on comparisons between soil cultivation and floating ...
Optimal operation of greenhouse crops requires an appropriate management of fertigation, especially when the availability and/or the quality of irrigation water are limited and/or there are environmental constraints, such as those derived...
moreOptimal operation of greenhouse crops requires an appropriate management of fertigation, especially when the availability and/or the quality of irrigation water are limited and/or there are environmental constraints, such as those derived from Nitrate Directive in Europe. The paper illustrates the main features of a decision support system (DSS) for the fertigation management in soilless culture, which is still under development in the framework of the European research project EUPHOROS. The DSS modules provide information on the optimal irrigation regime (based on the static hydrological properties of the growing medium) and on crop water and nutrients requirements (including both plant uptake and leaching requirement in open and semi-closed growing systems). An easy-to-use nutrient solution calculator and an extendable crop database have been integrated in the DSS. The DSS can assist the grower in daily operational management of fertigation as well as for off-line (prior-to-planting) simulation, for instance to compare-in terms of water and nutrients use efficiency-different fertigation strategies, growing system layouts, water qualities and/or crop species (analysis of the scenario). An example of such simulation is provided for tomato grown under saline conditions. INTRODUCTION The advantages of soilless culture over conventional soil cultivation (e.g., higher use efficiency of water, nutrients, labour etc.; better product quality) are fully achievable only in closed systems where nutrient effluents are recirculated (Stanghellini et al., 2007). However, the management of closed systems is more difficult due to the risk of root-borne diseases and the possible accumulation of non-essential ions in the recirculating Nutrient Solution (NS) (Pardossi et al., 2006). When poor quality irrigation water (e.g., saline water) is available, the progressive accumulation of ballast ions (such as Na and Cl) scarcely absorbed by the crop makes it necessary to discharge the recirculating NS (flushing) with consequent waste of water and fertilizers (i.e., semi-closed systems). In these systems, the knowledge of the recirculating NS composition is a key factor to optimize the fertigation management, in particular to decide when flushing is necessary, based on physiological and/or environmental criteria, e.g. taking in account of the limits imposed to the concentration of pollutants (e.g., NO 3) in the wastewater discharged to surface water by the legislation derived from European Nitrate Directive (The Council of the European Communities, 1991). In the framework of the European research project EUPHOROS (
http://www. euphoros.wur.nl/UK/), work is in progress to develop a decision support system (DSS) for the management of fertigation of greenhouse crops (Hydrotool). This paper illustrates the general structure of Hydrotool and reports the results of the validation of the models implemented in the DSS in order to simulate crop water and mineral relations. An example of the possible use of DSS for analysis of scenarios (different strategies for fertigation) is also reported.
... The paper presents a simple model for the changes in ion concentration and the related variations in Na of recirculating nutrient solution in closed-loop hydroponics. The model was calibrated for tomato (Lycopersicon esculentum Mill.)...
more... The paper presents a simple model for the changes in ion concentration and the related variations in Na of recirculating nutrient solution in closed-loop hydroponics. The model was calibrated for tomato (Lycopersicon esculentum Mill.) using data from the literature and, finally ...
This paper presents a simple model for the changes in ion concentration and electrical conductivity (EC) of the recirculating nutrient solution in a closed-loop soilless culture of tomato (Lycopersicon esculentum Mill.). The model was...
moreThis paper presents a simple model for the changes in ion concentration and electrical conductivity (EC) of the recirculating nutrient solution in a closed-loop soilless culture of tomato (Lycopersicon esculentum Mill.). The model was designed on the basis of a balanced equation for plant nutrient uptake: for macrocations (K, Mg and Ca), a linear dependence of concentration on crop water
The paper reports an aggregated model for the water requirements (W) of greenhouse tomato grown in spring or summer–autumn season in closed (recycling nutrient solution) rockwool culture. A series of experiments were conducted between...
moreThe paper reports an aggregated model for the water requirements (W) of greenhouse tomato grown in spring or summer–autumn season in closed (recycling nutrient solution) rockwool culture. A series of experiments were conducted between 2000 and 2003. In each experiment, two different nutrient solution treatments were established in a randomized block design, with three replicates. The nutrient solutions differed only
... delle colture in base ai livelli di luce e temperatura così da mas-simizzare il risparmio energetico e ottimizzare la programmazione dei cicli produttivi (Heins et al., 1987; Karlsson et al ... In: Enoch Z., Stanhill G. (eds.):...
more... delle colture in base ai livelli di luce e temperatura così da mas-simizzare il risparmio energetico e ottimizzare la programmazione dei cicli produttivi (Heins et al., 1987; Karlsson et al ... In: Enoch Z., Stanhill G. (eds.): Greenhouse ecosystems (Ecosystems of the world, volume 20). ...
In the absence of artificial supply of carbon dioxide in the greenhouse environment, the CO2 absorbed in the process of photosynthesis must ultimately come from the external ambient through the ventilation openings. This requires that the...
moreIn the absence of artificial supply of carbon dioxide in the greenhouse environment, the CO2 absorbed in the process of photosynthesis must ultimately come from the external ambient through the ventilation openings. This requires that the CO2 concentration within the house must be lower than the external concentration, as there would be no flow inwards otherwise. Since potential assimilation (that is, the assimilation level that can be attained when no other factor is limiting) is heavily dependent on carbon dioxide concentration, this implies that assimilation is reduced, whatever the light level or crop status. The ventilation of the greenhouse implies a trade-off between ensuring inflow of carbon dioxide and maintaining an adequate temperature within the house, particularly during sunny, chilly days. We apply a simple model, on which the Dutch ¿philosophy¿ of CO2 fertilisation is based, for estimating the potential production loss, through data measured in commercial greenhouses ...
Abstract: Rocket is an important leafy vegetable in Mediterranean countries and is mainly used to flavor salads. Soil grown rocket usually contains high level of nitrate about 7000-8000 mg kg-1 (ppm) and during the winter period this...
moreAbstract: Rocket is an important leafy vegetable in Mediterranean countries and is mainly used to flavor salads. Soil grown rocket usually contains high level of nitrate about 7000-8000 mg kg-1 (ppm) and during the winter period this value can easily overcome 9000 ppm. Rocket was used in our experiments as a model system for studying new technologies for reducing nitrate content in preharvest and postharvest stages. Experiments carried out as pre-harvest strategies were focused on comparisons between soil cultivation and floating ...
Page 1. HEIGHT CONTROL OF A BEDDING PLANT (Salvia splendens F. Sellow) BY COPPER SULPHATE FILTERS L. Incrocci and G. Serra Scuola Superiore di Studi Universitari e di Perfezionamento "S.Anna". Via Carducci 40 56100 Pisa,...
morePage 1. HEIGHT CONTROL OF A BEDDING PLANT (Salvia splendens F. Sellow) BY COPPER SULPHATE FILTERS L. Incrocci and G. Serra Scuola Superiore di Studi Universitari e di Perfezionamento "S.Anna". Via Carducci 40 56100 Pisa, Italy. В. ... J. Amer. Soc. Hort. Sci. ...
