|Title:||臺灣主要蔬菜產區土壤微量要素供應狀況之研究－Ⅱ. 銅、鐵、錳、鋅||Other Titles:||Copper, Iron, Manganese, and Zinc Status of the Main Vegetable Growing Soils in Taiwan||Authors:||李子純
Tze-Shun Lee Wang
|Issue Date:||5-Dec-1976||Publisher:||農業試驗所||Journal Volume:||25||Journal Issue:||4||Start page/Pages:||281-290||Source:||中華農業研究||Abstract:||
土壤微量要素之抽出，曾以三種方法比較，即：(1) 0.1NHCL,(2) 0.01M EDTA + 1M ammonium carbonate (PH8.6), (3) 1 N NH4OAC (pH4.8）；微量要素與土壤性質（包括土壤pH、有機質及粘粒含量）及微量要素吸收量與土壤性質之關係，均曾以單相關或複相關方法探尋。
土壤分析結果顯示，供試用土壤中此四種微量要素之含量除鋅之含量有部分地區較低外，其他銅、鐵及錳之含量均在一般文獻中（4,6,11,14），所定之臨界濃度以一上；而植物分析結果更顯示除鋅外，其他三微量要素在葉片中之含量均偏高。又由此四種微量要素之吸收量及其以不同抽出怯所測得之含量間之關係，顯示土壤中有效性鐵及錳之抽出，EDTA + ammonium carbonate法較0.1 N HCL法為佳，而銅及鋅之抽出則以0.1 N HCL法較佳。
由微量要素吸收量及其與土壤性質之關係發現，估計銅或鋅之吸收量應以0.1 N HCL自土壤中抽取之銅或鋅之含量與土壤pH、有機物及粘粒含量等共同估計之，其準確性銅可達59%，鋅可達64％。錳則可單以土壤中EDTA + ammonium carbonate抽取性錳之含量估計之（準確性達74%）。至於鐵之吸收量，則以此等因素估計仍不夠準確，而需以EDTA + ammonium carbonate抽取性錳及鋅之含量及Fe/Cu. Mn/Zn之比例等共同估％計之（準確性亦為74%）。
This study was carried out to investigate the status of copper, iron, manganese, and zinc of the main vegetable growing soils in Taiwan, as well as to evaluate a reliable method for extracting these micronutrients from soils.
Thirty representative soils selected from the main vegetable growing areas were used in a pot experiment in the greenhouse. The indicator plant was tomato. Plastic pots containing 5 kg. soil each were set up in 4 replications. Deionized water was used for irrigation. Reagent grade chemicals of (NH4)2 SO4, Ca (H2PO4)2 H2O, and KCL were used as the fertilizers. There was no micronutrient treatment.
Three extractants were tested for assessing plant available copper, iron, manganese,
and zinc. It was found that iron and manganese extracted with EDTA + ammonium carbonate were best correlated with plant uptake, While as for copper and zinc, 0.1 N HCL was the best extractant.
Relationships between extractable micronutrients and soil properties (soil pH, organic matter and clay content), uptake of micronutrients and soil variables were evaluated by simple and multiple correlation analysis.
From the correlation data it was found that the uptake of Cu was best predicted by the combination of 0.1 N HCL extractable Cu and soil properties (R=0.77**), and so was the uptake of Zn (R0.80**) . Mn uptake was significantly correlated with EDTA extractable Mn (R0.86**) . The prediction of Mn uptake was not improved by inclusion of one or more of the soil properties. Fe uptake was best predicted by the combination of EDTA extractable Mn, Zn and the ratio of Fe/Cu, Mn/Zn (R=0.86**).
Correlation data showed that the EDTA extractable Fe decreased with the increase in pH value. That the extractable Cu increased with an increase in clay content, and that both Cu and Zn increased with an increase in soil organic matter content.
Soil analysis data showed that except Zn, the contents of all the three micronutrients under study were more or less above the critical level as reported in the literature. Plant analysis data also showed that except Zn, the concentration of Cu, Fe, and Mn in tomato leaf were all higher than usual, especially that of Fe.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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