title: Effect of Straw Amendment on Soil Zn Availability and Ageing of Exogenous Water-Soluble Zn Applied to Calcareous Soil.
abstract: Organic matter plays a key role in availability and transformation of soil Zn (zinc), which greatly controls Zn concentrations in cereal grains and human Zn nutrition level. Accordingly, soils homogenized with the wheat straw (0, 12 g straw kg-1) and Zn fertilizer (0, 7 mg Zn kg-1) were buried and incubated in the field over 210 days to explore the response of soil Zn availability and the ageing of exogenous Zn to straw addition. Results indicated that adding straw alone scarcely affected soil DTPA-Zn concentration and Zn fractions because of the low Zn concentration of wheat straw and the high soil pH, and large clay and calcium carbonate contents. However, adding exogenous Zn plus straw increased the DTPA-Zn abundance by about 5-fold and had the similar results to adding exogenous Zn alone, corresponding to the increased Zn fraction loosely bounded to organic matter, which had a more dominant presence in Zn reaction than soil other constituents such as carbonate and minerals in calcareous soil. The higher relative amount of ineffective Zn (~50%) after water soluble Zn addition also occurred, and at the days of 120-165 and 180-210when the natural temperature and rainfall changed mildly, the ageing process of exogenous Zn over time was well evaluated by the diffusion equation, respectively. Consequently, combining crop residues with exogenous water soluble Zn application is promising strategy to maximize the availability of Zn in calcareous soil, but the higher ageing rate of Zn caused by the higher Zn mobility should be considered.
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Yanlong
authors.initials: Y
authors.lastname: Chen
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Cui
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Tian
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Aiqing
authors.initials: A
authors.lastname: Zhao
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Li
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Shaoxia
authors.initials: S
authors.lastname: Wang
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Xiushaung
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Zhou
authors.initials: Z
authors.lastname: Jia
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Key Lab of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Liu
mesh_terms: D000383:Agriculture; D002119:Calcium Carbonate / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D004369:Pentetic Acid / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014908:Triticum / Q000737:chemistry / Q000378:metabolism; D014867:Water / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D012987:Soil; D014867:Water; D004369:Pentetic Acid; D002119:Calcium Carbonate; D015032:Zinc