本试验就我国目前用于抗小麦干热风的几种化学药剂对蚕豆气孔开张度和小麦蒸腾失水的影响作了测定。结果表明,亚硫酸氢钠、石油助长剂、腐质酸、二氯化钙、水杨酸、8—羟基喹啉等,对蚕豆气孔的开张有不同程度的抑制作用,使小麦叶片的蒸腾强度和相对失水率明显下降。磷酸二氢钾有促进气孔开张的作用,使蒸腾强度和相对失水率相应增大。浓度试验表明,0.5×10~(-2)M 的亚硫酸氮钠和二氯化钙,200ppm 的腐质酸,可使蒸腾降低50%以上,气孔开张度缩小60%左右。考虑到上述三种药剂对人畜无毒,且价钱便宜,值得进一步作大田应用试验。 In this experiment, the effects of several chemical agents currently used in wheat on the dry and hot wind of wheat against stomatal opening and wheat transpiration dehydration were tested. The results showed that sodium bisulfite, petroleum aids, humic acid, calcium chloride, salicylic acid, 8-hydroxyquinoline and other open-ended stomatal opening to varying degrees, so that the transpiration of wheat leaves And the relative water loss decreased significantly. Potassium dihydrogen phosphate has the role of promoting stomatal opening, so that the relative transpiration rate and relative water loss increases. Concentration tests showed that 0.5 × 10 ~ (-2) M sodium sulfite and calcium chloride, 200ppm of humic acid can reduce transpiration by more than 50% and pore opening by 60%. Taking into account the above three kinds of pharmaceutical agents non-toxic to humans and animals, and the price is cheap, it is worth further field trials.