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Extractability of nutrients using Mehlich 3 and ammonium bicarbonate-DTPA methods for selected grassland soils of China

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  • Chunping ZHANG

    (StateKey Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P.R. China)

  • Decao NIU

    (StateKey Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P.R. China)

  • Yuntao REN

    (StateKey Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P.R. China
    Urumqi City Agricultural and Pastoral Bureau, Urumqi, P.R. China)

  • Hua FU

    (StateKey Laboratory of Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, P.R. China)

Abstract

This study aimed to obtain a simple and efficient soil extraction method as an exhaustive and systematic technology guideline for the determination of potentially available phosphorus (P), potassium (K), magnesium (Mg), iron (Fe), copper (Cu), manganese (Mn) and zinc (Zn) in various grassland soils covering different regions. In this study, 25 soil samples from 5 different grassland types of China were collected to measure the amounts of potentially available nutrients and to compare the results of Mehlich 3, the ammonium bicarbonate-diethylenetriaminepentaacetic acid (AB-DTPA) and other four methods which are widely used in China (i.e. Olsen, Bray 1, 1 mol/L NH4OAc, CaCl2-DTPA, called conventional methods). The results showed that the amounts of potentially available nutrients extracted by different methods were significantly different. Moreover, a positively significant correlation was obtained between the amounts of potentially available nutrients extracted by conventional methods and those extracted by Mehlich 3 and AB-DTPA. However, for Mg and Mn, the results from AB-DTPA appeared to have a stronger relationship with the results from the conventional method than with the results from Mehlich 3. These differences might be caused by the effect of soil pH. Our results suggested that both Mehlich 3 and AB-DTPA can be effectively used to measure nutrients availability in grassland soils, while the AB-DTPA will be more recommended to measure the amounts of potentially available nutrients in alkaline soils.

Suggested Citation

  • Chunping ZHANG & Decao NIU & Yuntao REN & Hua FU, 2018. "Extractability of nutrients using Mehlich 3 and ammonium bicarbonate-DTPA methods for selected grassland soils of China," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(9), pages 448-454.
    • Handle: RePEc:caa:jnlpse:v:64:y:2018:i:9:id:315-2018-pse
    DOI: 10.17221/315/2018-PSE
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    References listed on IDEAS

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    1. A.K. Pradhan & K.S. Beura & R. Das & D. Padhan & G.C. Hazra & B. Mandal & N. De & V.N. Mishra & K.B. Polara & S. Sharma, 2015. "Evaluation of extractability of different extractants for zinc and copper in soils under long-term fertilization," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 61(5), pages 227-233.
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