EVA film refers to the agricultural film with ethylene-vinyl acetate copolymer as the main raw material, while PO film is the raw material (special PE, metallocene, EVA, etc.) and other additives using advanced olefins. Their specific differences are as follows:
1. Light transmission effect. The average light transmittance of the PO film was 71.17%, which was
15.18% higher than the average light transmittance of EFI film of 61.19%.
2. The effect on the temperature inside the greenhouse. The temperature and ground temperature of the PO film covering the greenhouse are significantly higher than that of the EVA film, especially in the relatively cold January and February, the effect is more obvious.
3. The effect of shed film covering on plant growth. The plant growth surface in the PO membrane greenhouse was faster than that in the EVA membrane greenhouse. Experiments showed that the growth period and the picking period of the plants in the PO membrane greenhouse were earlier than those in the EVA membrane greenhouse.
4. Effects on plant yield. It has been proved by experiments that the plants in the PO membrane greenhouse are higher than the production in the EVA membrane greenhouse.