GREENHOUSES FOR MILD-WINTER CLIMATES: GOALS AND RESTRAINTS

A. Monteiro
The problems and specificity of the production of vegetable and ornamental crops in mild-winter greenhouses are discussed considering the mild-winter cropping concept, protected cultivation conditions, greenhouse construction and management, influence of low night temperature on yield and quality, methods of increasing night temperature and future perspectives. The mild-winter concept refers to greenhouse winter cropping under minimal climatic modifications and so plants are submited to stress environmental conditions. Mild-winter climatic conditions are better evaluated by crop performance than by physical parameters. Climatic limiting factors depend on the region considered and strongly influence greenhouse characteristics. The influence of climate, transport cost and competitiveness with other production areas on the profitability of mild-winter cropping is analysed. The low quality of products is a major problem in the mild-winter and it should be given priority than to yield increase. Quality strongly depends on low night temperatures and other stress climatic factors. Greenhouse characteristics are discussed in relation to crop productivity and quality, and in relation to the need of reciprocal adaption between crop and greenhouse management. The goal of mutual adaptation is to reduce the effect of undesirable environmental conditions on crop yield and quality. An integrated approach of greenhouse engineering, climatology, crop physiology, cultural practices and plant breeding should be followed to improve greenhouse production. Finally a few perspectives for the evolution of the system are presented considering better climate-proof greenhouses and higher labour efficiency.
Monteiro, A. (1990). GREENHOUSES FOR MILD-WINTER CLIMATES: GOALS AND RESTRAINTS. Acta Hortic. 263, 21-32
DOI: 10.17660/ActaHortic.1990.263.1
https://doi.org/10.17660/ActaHortic.1990.263.1
English

Acta Horticulturae