| Summary: | 碩士 === 國立臺灣大學 === 農業化學研究所 === 101 === Chemical stabilization have been used to remediate copper (Cu) and zinc (Zn) contaminated soil for the purpose of reducing the Cu and Zn concentration of crops. However, previous studies emphasized on finding efficient amendments to reduce Cu and Zn concentration of crops, few of them investigated Cu-Zn interaction of crops and soil after applying lime or compost. The objective of this research aims to understand the Cu-Zn interaction of crops and soil after applying lime or compost, as well as predicting Cu and Zn concentration of crops by using three extractants. Rice (Oryza sativa L. Tainan 11) and Bok Coy (Brassica chinensis L. cv. Ching-Geeng) were chosen. Three spiked Cu concentration are 0 mg/kg, 75 mg/kg, and 150 mg/kg; three spiked Zn concentration are 0 mg/kg, 200 mg/kg, and 400 mg/kg; three amendments are no amendment (NA), lime, and compost. Chemical fertilizer was applied to every treatment, and conducted in four replicates.
Results indicated that in NA and lime treatment, grain yield was not affected by Cu-Zn interaction. While under compost treatment, grain yield was significantly affected by Cu-Zn interaction, and grain yield was reduced markedly when soil was mixed with the combination of Cu and Zn.
The effect of Cu-Zn interaction on Cu and Zn concentration in different parts of rice are as follows: brown rice > shoot ≒ root. Whether amendments were applied or not, adding Zn 400 mg/kg to soil spiked with Cu 75 or 150 mg/kg may stimulate brown rice to uptake Cu. Application of Cu 75 or 150 mg/kg to soil spiked with Zn 200 or 400 mg/kg doesn’t stimulate brown rice to uptake Zn. Therefore, the effect of Zn addition on brown rice to uptake Cu is stronger than Cu addition on brown rice to uptake Zn.
In NA treatment, the weight of Bok Coy was affected by Cu-Zn interaction, and its weight was decreased after using combined Cu and Zn treatment. After applying lime or compost, Zn addition or Cu addition had no effect on Bok Coy’s weight. In NA treatment, adding Zn 200 mg/kg or 400 mg/kg to soil spiked with Cu 75 mg/kg or 150 mg/kg inhibited Bok Coy to uptake Cu, while the situation didn’t occur after applying lime or compost. With or without applying lime or compost, adding Cu 75 mg/kg or 150 mg/kg to soil spiked with Zn 0 mg/kg, Zn 200 mg/kg or Zn 400 mg/kg didn’t stimulate Bok Coy to uptake Zn. To sum up, Zn addition can inhibit Bok Coy to uptake Cu; Cu addition can’t affect Bok Coy to uptake Zn.
In general, whether amendments were applied or not, 0.05 M EDTA and 0.005 M DTPA extractable Zn concentration wasn’t stimulated or inhibited by Cu addition, and vice versa. In NA treatment, Zn addition stimulates 0.01 M CaCl2 extractable Cu concentration, and vice versa. After applying lime and compost, Zn addition or Cu addition doesn’t stimulate 0.01 M CaCl2 extractable Cu and Zn concentration.
Whether amendments were applied or not, 0.05 M EDTA, 0.005 M DTPA and 0.01 M CaCl2 extractable Cu concentration can be used to predict Cu concentration of brown rice and Bok Coy. In NA treatment, 0.05 M EDTA, 0.005 M DTPA and 0.01 M CaCl2 extractable Zn concentration can be used to predict Zn concentration of Brown rice.
Whether amendments were applied or not, 0.05 M EDTA, 0.005 M DTPA and 0.01 M CaCl2 extractable Cu concentration can be used to predict Cu concentration of brown rice and Bok Coy. In NA treatment, 0.05 M EDTA, 0.005 M DTPA and 0.01 M CaCl2 extractable Zn concentration can be used to predict Zn concentration of Brown rice. Whether amendments were applied or not, 0.05 M EDTA, 0.005 M DTPA and 0.01 M CaCl2 extractable Zn concentration can be used to predict Zn concentration of Bok Coy.
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