Abstract:

To explore the variation law of temperature, humidity and light intensity of different span arch sheds in the arid belt of central Ningxia, we selected four local double membrane arch sheds spanning 8, 10, 16 and 20 meters, and used zigvine wiring equipment to detect relevant environmental parameters. The results showed that the greenhouse environment was greatly affected by the external weather, and the variation trend of environmental parameters in these four arch sheds was almost the same except some differences. In terms of temperature, with the increase of the span, the average temperature of 16-meter-span in January was the highest, followed by that of the 8-meter-span and 12-meter-span, and that of the 10-meter-span was the lowest. In the three typical weathers of sunny, snowy and cloudy days, the all-day temperature of the 10-meter-span could be maintained at a high level. In terms of humidity, the four spans could maintain relatively appropriate air humidity (relative humidity 40%-70%). The light intensity is low in the four arch sheds and showed a single peak curve in sunny, snowy and cloudy days. Generally speaking, the 10-meter-span shed can maintain good temperature, humidity and light transmittance in winter, and is more suitable for local promotion.

Key words: facility agriculture, arch shed, span, air temperature, relative humidity, light intensity