Plant Soil Environ., 2015, 61(8):339-343 | DOI: 10.17221/666/2014-PSE

Phosphorus release from the soils in the Yellow River Delta: dynamic factors and implications for eco-restorationOriginal Paper

Y.-C. Lv1, G. Xu1, J.-N. Sun1, M. Brestič1,2, M. Živčák2, H.-B. Shao1,3
1 Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, P.R. China
2 Department of Plant Physiology, Slovak Agricultural University, Nitra, Slovak Republic
3 Institute of Agro-biotechnology, Jiangsu Academy of Agricultural Sciences,

Root-released organic acids are reported to increase phosphorus (P) availability in the soil. In this study a dynamic study of P release from soil was conducted to get more exact information of the organic acids role in P availability in soil. The results show that organic acids in different concentrations significantly affected P release. In a concentration of 10 mmol/L, no significant differences can be observed among citric acid, malic acid and acetic acid in terms of their effect on the release of soil P. However, when the concentration reduced to 1 mmol/L, both the total release amount and the maximum release amount of soil P significantly declined, and the decline degree were citric acid < malic acid < oxalic acid and acetic acid. When the concentration of organic acids was 0.1 mmol/L no P has been leached in the leaching solution of any of the four types of organic acids. The parabolic diffusion equation showed that organic acids can improve the migration rate of P in the soil, with the following order of citric acid > malic acid > acetic acid > oxalic acid. The higher the concentration of the organic acids was, the higher the migration rate of P would be. Given that the P needed by plants basically migrates by means of diffusion, under the condition of P deficiency of plants, improving the secretion amount of organic acids can effectively increase the biological utilization rate of P.

Keywords: macronutrient; dynamic leaching; fertilizer; plant-available

Published: August 31, 2015  Show citation

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Lv Y-C, Xu G, Sun J-N, Brestič M, Živčák M, Shao H-B. Phosphorus release from the soils in the Yellow River Delta: dynamic factors and implications for eco-restoration. Plant Soil Environ. 2015;61(8):339-343. doi: 10.17221/666/2014-PSE.
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