Journal
ECOLOGY AND EVOLUTION
Volume 7, Issue 20, Pages 8419-8426Publisher
WILEY
DOI: 10.1002/ece3.3295
Keywords
crop nutrition; isotopic tracing; karst soil; nitrogen transfer; nitrogen uptake; soybean; maize intercropping
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Funding
- National Key Research and Development Program [2016YFC0502505]
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources [SKL201403]
- Guangxi Science and Technology Development Plan [GKG1598016-2]
- National Science and Technology Support Plan [2015BAD06B04]
- Youth Innovation Team Project of ISA, CAS [2017QNCXTD_XXL]
- Western Light Program of Talent Cultivation of the Chinese Academy of Sciences
- Guangxi Provincial Program of Distinguished Expert in China
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Nitrogen (N) deficiency occurs in over 80% of karst soil of southwest China, which restricts regional agricultural production. To test whether N fixed by legumes becomes available to nonfixing companion species, N fluxes between soybean and maize under no, partial, and total restriction of root contact were measured on a karst site in southwest China. N content and its transfer between soybean and maize intercrops were explored in a 2-year plot experiment, with N movement between crops monitored using N-15 isotopes. Mesh barrier (30m) and no restrictions barrier root separation increased N uptake of maize by 1.28%-3.45% and 3.2%-3.45%, respectively. N uptake by soybean with no restrictions root separation was 1.23 and 1.56 times higher than that by mesh and solid barriers, respectively. In the unrestricted root condition, N transfer from soybean to maize in no restrictions barrier was 2.34-3.02mg higher than that of mesh barrier. Therefore, it was implied that soybean/maize intercropping could improve N uptake and transfer efficiently in the karst region of southwest China.
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