磷石膏资源化利用对玉米生长影响

Effect of Recycling and Reuse of Phosphogypsum on Corn Growth

本试验研究了磷化工的主要污染物固体废渣磷石膏的农业资源化利用。室内测定了磷石膏浸提液对玉米种子有关指标的影响。结果表明,磷石膏浸提液在6 d之内抑制玉米种子的萌发,浓度越高,玉米发芽率越低,且对第3天和第4天的发芽率影响最大。低浓度的磷石膏可以促进α-淀粉酶和(α+β)–淀粉酶的活性,并在0.25%的浓度达到最高值。玉米吲哚乙酸含量有明显变化,0.1%～0.125%浓度处理会使吲哚乙酸含量减少,在0.125%浓度吲哚乙酸含量达到最低值,比对照低27.73μg·g-1,在0.5%达到最高值。种子的吲哚乙酸氧化酶活性降低,0.25%磷石膏抑制作用最强。

Agricultural recycling and reuse of phosphogypsum,a principal solid waste polluter in phosphous chemical plant,were conducted.Effects of phosphogypsum extract on corn seed were investigated in lab.The results showed that phosphogypsum extract significantly inhibited the germination of corn seeds within 6 days.The higher the concentration of phosphogypsum extract was,the lower the germination rate,which was inhibited at the third and fourth day.Low concentration of phosphogypsum extract could promote α-amylase and（α ＋ β）-mylase activity which reached the maximum value at the concentration of 0.25 %.Indole acetic acid decreased in the corn seed treated with phosphogypsum extract concentrations of 0.1 %-0.125 %,and at the concentration of 0.125 %,the IAA content was the lowest,which was 27.73 μg/g lower than that of CK.With the higher concentrations of phosphogypsum extract,Indole acetic acid significantly increased and reached the highest at 0.5 %.The seeds treated with phosphogypsum extract showed that the Indole acetic acid oxidase activity decreased,on which there existed the strongest inhibitory effect of phosphogypsum extract at 0.25 %.