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以不同浓度（１０万、４０万、６０万单位·Ｌ－１）的青霉素水溶液对大田扬花期的小麦进行叶面喷施，经测定发现，处理后旗叶的蒸腾速率、叶绿素含量和硝酸还原酶活性均高于对照，穗粒数增加１．６０～２．８９粒，千粒重增加１．６７～２．９８ｇ，每公顷增产６８４．１５～１２４９ｋｇ，增产百分率为８．６３～１５．７６％。从本试验的各项生理指标和产量指标综合来看，青霉素在小麦生产中具有较大的应用价值，其较佳的使用浓度约为１０万单位·Ｌ－１。
Spraying wheat in the field at flowering stage was sprayed with different concentrations of penicillin aqueous solutions (100,000, 400,000 and 600,000 units · L-1). The transpiration rate, chlorophyll content and nitrate reduction Enzyme activities were higher than the control, grain number increased 1.60 ~ 2.89 grain, 1000 grain weight increased 1.67 ~ 2.98g, yield per hectare 684.15 ~ 1249kg, the yield was 8.63 ~ 15.76% . From the comprehensive physiological indexes and yield indexes of this experiment, penicillin has great application value in the wheat production, and its preferred concentration is about 100,000 units · L-1.