试验表明，将塑料大棚内二氧化碳的浓度由０．０３％增加到０．１％，一般可使蔬菜增产１０％～１５％。在塑料大棚内施二氧化碳，可采用下述几种方法： １．增施有机肥料。增施有机肥能增加土壤腐殖质，改善土壤理化性状，促进根系的呼吸作用和微生物的分解活动，从而增加二氧 Experiments show that the plastic greenhouse carbon dioxide concentration increased from 0.03% to 0.1%, generally can increase the yield of vegetables 10% to 15%. Apply carbon dioxide in a plastic greenhouse can be used in the following ways: 1. Add organic fertilizer. Adding organic fertilizer can increase soil humus, improve soil physical and chemical properties, promote root respiration and microbial decomposition activities, thereby increasing dioxygen