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- Title
The links between potassium availability and soil exchangeable calcium, magnesium, and aluminum are mediated by lime in acidic soil.
- Authors
Han, Tianfu; Cai, Andong; Liu, Kailou; Huang, Jing; Wang, Boren; Li, Dongchu; Qaswar, Muhammad; Feng, Gu; Zhang, Huimin
- Abstract
Purpose: The aims of this study were to investigate the links between potassium (K) uptake by crops and soil K, exchangeable calcium (Ca2+), magnesium (Mg2+), and aluminum (Al3+) when using lime in acidic soil in southern China.Materials and methods: Soil samples of three treatments (chemical NP fertilizers, NPK, and NPK plus straw (NPKS)) were collected from a 26-year field experiment (0-20 cm) and then a rhizobox experiment was conducted with seven lime application rates (0-2.26 g kg−1). We investigated the soil exchangeable K+, Ca2+, Mg2+, and Al3+ and non-exchangeable K (NEK) in the rhizosphere soil (RS) and non-rhizosphere soils (NRS), and K uptake by crops.Results and discussion: As lime addition rates increased, the average concentration of exchangeable K (EK) in RS under NPK and NPKS treatments decreased to 46.5 mg kg−1 and 70.4 mg kg−1 for maize and wheat, respectively. In treatments with lime application, the NEK concentration was higher in RS and NRS compared with the no-lime in NP treatment but was lower in RS in treatments with K fertilizer input (NPK and NPKS). The K uptake by crops under lime application significantly (p < 0.05) increased by 37.6% to 155.1% compared with the no-lime treatments. Lime application significantly increased soil exchangeable Ca2+ (42.9 to 255.7%) and decreased exchangeable Al3+ (23.7 to 86.6%). According to structural equation modeling, lime indirectly influenced K uptake by crops through its effects on soil exchangeable Ca2++Mg2+ and Al3+, EK, and NEK, which accounted for up to 39% (RS) and 46% (NRS) of the variation in the K uptake by crops. Lime directly and negatively affected EK and NEK in NRS but had no direct effects on EK and NEK in RS.Conclusions: Our results suggested that lime-induced K uptake by crops was mediated by K+, Ca2+, and Al3+, and that lime application resulted in higher soil K availability.
- Subjects
CHINA; ACID soils; POTASSIUM fertilizers; LIMING of soils; STRUCTURAL equation modeling; CALCIUM in soils; MAGNESIUM
- Publication
Journal of Soils & Sediments: Protection, Risk Assessment, & Remediation, 2019, Vol 19, Issue 3, p1382
- ISSN
1439-0108
- Publication type
Article
- DOI
10.1007/s11368-018-2145-6