Abstract
The effect of plastic tunnels on air temperatures was investigated with a perforated area of 0·65, 1·3, 2·6, 3·9, 5·2 and 6·5% under varying weather conditions as defined by cloud-cover observations. The diameter of the openings was 10 cm. The effect on temperature was calculated for day-time maxima, night-time minima, 24-h range, average and daily sequence of temperature. Perforation resulted in a marked reduction in the amount of day-time heat and in maximum day-time temperatures, though minimum night-time temperatures were lowered only as much as 1°C. The use of adequately ventilated tunnels together with an extended period of covering towards harvesting seems to imply considerable advantages over conventional methods of cultivation.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
