Nitrogen uptake and transfer in a soybean/maize intercropping system in the karst region of southwest China

Ecology and Evolution
Hao ZhangYouzhi Li

Abstract

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 15N isotopes. Mesh barrier (30 μm) 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 2.34-3.02 mg 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.

References

Mar 27, 2012·The Science of the Total Environment·M E IsaacJ M Harmand
May 25, 2016·Proceedings of the National Academy of Sciences of the United States of America·Bai LiLong Li

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Citations

Jun 16, 2021·Frontiers in Microbiology·Barbara PivatoPhilippe Lemanceau

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Software Mentioned

SPSS
SPSS19

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