(Soil-independent (soilless) cultural techniques in vegetable cultivation production method, profitability and environmental compatibility)

alemania allemagne beneficio bruto calidad cucumis sativus cultivo de hortalizas cultivo sin tierra cultivos de invernadero culture sans sol environmental impact fertilisation fertilizer application germany greenhouse crops gross margins impact sur l'environnement impacto ambiental irrigation methods lycopersicon esculentum marge brute plant protection plante de serre production costs protection des plantes quality site factors soilless culture valerianella locusta vegetable growing