莠去津土壤残留对下茬黄瓜幼苗生长和生理指标的影响

Effects of Atrazine Soil Residue on Growth and Physiological Indexes of Cucumber Seedlings in the Next Crop

为了明确莠去津土壤残留对后茬黄瓜的影响,本试验模拟莠去津在土壤中残留浓度(0~0.40 mg/kg)进行育苗实验。结果表明,莠去津土壤残留在(0~0.40 mg/kg)浓度范围内对黄瓜种子出苗率影响不显著;当处理浓度达到0.10 mg/kg时,开始抑制黄瓜幼苗生长,且幼苗地下部较地上部敏感,受抑制率大。处理浓度达0.30 mg/kg时,净光合速率较对照下降56%,幼苗死亡率超过50%,严重伤害幼苗生长;处理浓度达0.40 mg/kg时,幼苗死亡率接近100%。随着处理浓度增加,幼苗SOD活性、POD活性、丙二醛含量、可溶性糖含量上升,叶绿素含量、净光合速率与根系活力下降。

In order to understand the effect of the soil residue of Atrazine on the cucumber, this test simulates the residual concentration of atrazine in the soil(0~0.40 mg/kg) for seedling experiments. The results show,the concentration of atrazine soil in the range of(0~0.40 mg/kg) has no significant effect on the emergence rate of cucumber seeds.When the treatment concentration reached 0.10 mg/kg, the growth of cucumber seedlings began to be inhibited, and the underground part of the seedlings was more sensitive than the aerial part, and the inhibition rate was larger than that. When the concentration reached 0.30 mg/kg, the net photosynthetic rate decreased by 56% compared with the control, and the seedling mortality rate exceeded 50%, which seriously damaged the growth of seedlings. When the treatment concentration reached 0.40 mg/kg, the seedling mortality rate was close to 100%. With the increase of treatment concentration, the SOD activity, POD activity, malondialdehyde content and soluble sugar content of seedlings increased, chlorophyll content, net photosynthetic rate and root activity decreased.