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Response of Exogenous Zinc Availability and Transformation to Maize Straw as Affected by Soil Organic Matter
Author(s) -
Chen Yanlong,
Jia Zhou,
Liu Ke,
Tian Xiaohong,
Wang Song,
Wang Shaoxia,
Li Xiushuang,
Zhao Huili,
Shar Abdul Ghaffar
Publication year - 2017
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2016.11.0374
Subject(s) - calcareous , chemistry , soil organic matter , organic matter , environmental chemistry , straw , zinc , cation exchange capacity , soil fertility , soil ph , soil water , agronomy , soil science , geology , inorganic chemistry , paleontology , organic chemistry , biology
Core Ideas Calcination procedure reduces SOM while maintaining other properties in calcareous soil. Exogenous Zn increases DTPA‐Zn concentration, especially in calcareous soil with high SOM. Straw amendment ephemerally reinforces the increase of soil Zn availability with adding Zn. Fixation of exogenous Zn mainly produces calcite and montmorillonite in calcareous soil. Zinc (Zn) availability and transformation in calcareous soil are closely associated with organic matter abundance. Here, two soils with a wide range of soil organic matter (SOM) content were incubated without amendment, with Zn fertilization alone, or with Zn fertilization plus maize straw, followed by evaluation of changes in soil diethylenetriaminepentaacetic acid (DTPA)‐Zn, Zn fractions, Zn mobility (mobility factor, M F ), stability (reduced partition index, I R ), and Zn fixation by minerals with X‐ray diffraction patterns. Soil with decreased SOM was prepared by combustion of initial soil at 375°C. Soil with 75% reduction in SOM markedly reduced soil total N, microbial biomass C, and dissolved organic matter in comparison with the initial soil, but no differences in carbonate content, cation exchange capacity, specific surface area, pH, particle distribution, or mineral content were observed. Additionally, soil with 75% removal of SOM showed much lower soil DTPA‐Zn abundance and M F but higher I R . Exogenous Zn alone increased soil DTPA‐Zn abundance and M F , especially immediately after incubation in the initial soil. However, in soil with 75% removal of SOM, more Zn was transformed into fractions of carbonate (calcite) and other minerals (montmorillonite), corresponding to a higher I R . Soil with Zn plus straw had a soil DTPA‐Zn concentration similar to that of soil with Zn alone but showed a markedly increased M F and a reduced I R , especially immediately after incubation. Therefore, soil water‐soluble Zn fertilizer may be an efficient method of reducing Zn deficiency in calcareous soil as crop straw is incorporated extensively into soil.