Effects of Organic Acids on Availability of Phosphate and Growth of Corn in Phosphate and Salts Accumulated Soil
Effects of Organic Acids on Availability of Phosphate and Growth of Corn in Phosphate and Salts Accumulated Soil
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DOI：
10.7745/kjssf.2016.49.3.265
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Myung-Sook Kim;Seong-Jin Park;Changhoon Lee;S. Yun;B. Ko;Jae-E. Yang
中科院分区：
文献类型：
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作者：
Myung-Sook Kim;Seong-Jin Park;Changhoon Lee;S. Yun;B. Ko;Jae-E. Yang
积累的磷酸盐可以通过有机酸的配体交换反应释放。研究了有机酸对磷盐累积土壤磷素有效性及作物生长的影响。土壤样品取自农户大棚。土壤有效磷和电导率分别为30 0 5mg kg-1和16 6 3dS m-1，分别比作物生长最适范围高6倍和8倍。将玉米在盆中栽培2个月。处理为不处理（对照）、磷肥（P）、柠檬酸（CA）1、5、10 mM和草酸（OA）1、5、10 mM。结果表明，有机酸能提高土壤水溶性磷和速效磷含量。在10 mM浓度下，有机酸对水溶性磷的有效性顺序为柠檬酸（44%）>草酸（32%）。柠檬酸1和5 mM处理显著增加了玉米的株高和干重，柠檬酸1 mM处理玉米吸收的磷、氮、钾、钙和镁比其他处理多。即使通过添加10 mM柠檬酸来提高土壤磷的有效性，但由于高浓度的柠檬酸通过增加电导率而引起盐害，玉米的生长受到抑制。因此，1 mM的柠檬酸有可能提高磷酸盐的利用率和玉米的健康生长。
Accumulated Phosphate can be released by ligand exchange reaction of organic acids. The objective of this study was to evaluate effects of the organic acids on the availability of phosphate and the growth of crop in phosphate and salts accumulated soil. Soil samples were collected from farmer’s plastic film house. Available phosphate and electrical conductivity of soil were 3,005 mg kg -1 and 16.63 dS m -1 which were 6 and 8 times higher than the optimum range of soil for crop growth, respectively. Corns were cultivated in pots for 2 months. Treatments were no treatment (control), phosphate fertilizer (P), citric acid (CA) 1, 5, 10 mM, and oxalic acid (OA) 1, 5, 10 mM. Water soluble phosphorus, available phosphate, corn growth and uptake were determined after cultivation. Results showed that organic acids increased water soluble phosphorus and available phosphate. For the level of 10 mM, the order of effectiveness of organic acids for water soluble P was citric acid (44%) > oxalic acid (32%). Height and dry weight of corns were increased significantly by the treatment of citric acid 1 and 5 mM. Also, corn absorbed more phosphorus, nitrogen, potassium, calcium and magnesium in the treatment of citric acid 1 mM than these of other treatments. Even though phosphate availability of soil was enhanced by addition of citric acid 10 mM, the growth of corns decreased because high concentration of citric acid caused salt damage by increasement of electrical conductivity. Thus, the citric acid of 1 mM has the potential to improve the availability of phosphate and the healthy growth of corns.