The various polymer films used as agricultural greenhouse cover protect the vegetation against climatic hazards, allow to modify the production calendar (dates of seeding, plantation and yield) and constitute an essential factor in the management of the greenhouse microclimate. However, they are progressively degraded by climatic and environmental factors (temperature, humidity, wind, insolation, etc.) and the multitude of climates that characterize our country create difficulties for an appropriate choice of roofing material.
This work is based on the study of the eco-physiological behaviour of Eucalyptus camaldulensis and tomato cultivated under 3 plastic greenhouses differentiated by 3 types of cover films (monolayer, tri-layer and ordinary). The climatic parameters were recorded daily and the weekly evolution of the biometric parameters of these planted species was measured.
The role of this study is to evaluate the productivity and yield of these species according to the biometric parameters as well as the quality of the essential oils that can be drawn from the leaves of Eucalyptus. The evolution has been studied from germination to an advanced level of development. The soil used for Eucalyptus is enriched by residual sludge from wastewater treatment plant in Tiaret city (Algeria). All this, in order to optimize the conditions of the influence of this new type of greenhouse on the development of the species considered in this study.
The present work is based on the eco-physiological, eco-edaphic and economical side compared to the yield of tomato and the composition of the essential oils of Eucalyptus.
We’ve found that Monolayer Plastic gives very good performances in terms of germination and growth, in addition to the visual quality of Eucalyptus leaves as well as tomato yield. However, we’ve obtained a rapid degradation of the film considered. Indeed, the mechanical properties have considerably decreased which led to its rupture. For the other cover films in this study, we have actually observed a difference in the yield but these films have not undergone such a rapid degradation.