reliminary study on environmental adaptability of Venlo greenhouse in tropics of Hainan province

In order to study climate adaptability of Venlo greenhouse originated from the Netherlands, air temperature, facilities surface temperature, light intensity, humidity and carbon dioxide concentration were tested in Hainan province in 2010 by 5 point method and 9 point method. The results indicated that in the conditions of tropical monsoon climate, Venlo greenhouse had a certain thermo-keeping effect in cold season and a cooling effect in the hot season, but the temperature difference of indoor and outdoor was less than 1, the temperature capability of Venlo greenhouse was poor in tropical regions, so we needed to improve the thermo-keeping effect, add cooling measures. The land surface temperature difference of indoor and outdoor was up to 15, the cooling effect was obvious; on the other hand, the steel frame temperature of greenhouse roof was so high that covering material life became short. Venlo greenhouse had dehumidified effect in cold season and moisture retention effect in hot season, humidity difference of indoor and outdoor was less than 3.0%, the effect was smaller. The transmittance of Venlo greenhouse was not high in Hainan province, but the light intensity in the Venlo greenhouse was enough to meet the physical needs of crops. The carbon dioxide concentration was high in Venlo greenhouse in Hainan, so we didnt need applying carbon dioxide fertilizer.