SIMPLE METHODS FOR REDUCING SOIL-TEMPERATURE IN POLYETHYLENE CONTAINERS IN GREENHOUSES IN THE TROPICS

Several simple cooling methods have been shown to prevent excessive he ating of soil in greenhouse pot experiments. The methods recommended a re (1) Maintaining the soil moist (pF2 was used in this study); (2) Sh ielding the outside and bottom the pots with aluminized insulation pap er; (3) Watering the floor of the greenhouses during the hottest part of the day; and (4) Using shade cloth where the experimental plants ar e not susceptible to etiolation under reduced light intensity. The eff ect of these relatively cheap methods on soil temperature are partiall y additive and therefore enhance the options.