甜玉米由于自身特性及气候、栽培等因素,虫害严重,甜玉米农药残留是限制甜玉米市场消费增长和产业发展的重要因素。选用甜玉米品种佛甜2号,药剂为大田生产常用药剂—高效氯氰菊酯,研究甜玉米中后期施药次数、施药量对甜玉米子粒农药残留量的影响及农药降解规律。结果表明,氯氰菊酯在甜玉米上的残留量随时间的延长迅速减少,消解曲线均为指数方程;在叶上的残留量远远高于其他部位,在茎、苞叶、穗轴和子粒中的残留依次降低;残留量与喷药次数、喷药量密切相关。收获期甜玉米子粒、穗轴上的农药残留低于检出限量,苞叶上的残留量低于国际标准,收获后3 d甜玉米秸秆上的农药残留量低于相应国家饲料标准;采收期前15 d左右,以常用剂量的两倍进行氯氰菊酯喷雾,穗轴、子粒中均无氯氰菊酯农药残留检出,不会影响甜玉米子粒的食用安全性;收获后3 d秸秆做青贮饲料和穗渣做食用菌培养材料也是安全的。 Because of its own characteristics and climate, cultivation and other factors, sweet corn is a serious insect pest. Sweet corn pesticide residue is an important factor that limits the growth of consumption and market in sweet corn market. The sweet corn variety, “Fo Tian 2”, was selected as the common pesticide in the field to produce beta-cypermethrin. The effects of the number of pesticides applied in the middle and late stages of sweet corn on pesticide residues in sweet corn and the degradation of pesticides were studied. The results showed that the residual amount of cypermethrin on sweet corn decreased rapidly with the prolongation of time. The digestion curves were exponential. The residues on the leaves were much higher than those of other parts. In the stem, husk, cob and grain Followed by reduced residues; residual amount and spray number, spray volume are closely related. The harvest of sweet corn kernels, the cob residue on the cob was below the detection limit, the residue on the husk leaves was below the international standard, and the pesticide residues on the sweet corn stalks after 3 days of harvest were lower than the corresponding national feed standards; Cypermethrin was sprayed at about twice of the usual dosage in the first 15 days of the period. No cypermethrin pesticide residue was detected in the cob and kernel, which would not affect the safety of sweet corn grains. After 3 d of harvest, the straw was used as silage and spike Slag to make edible mushroom cultivation material is also safe.