Soybeans grow better nodules when planted next to mulberry trees
Liu C, Li J, Zhu K, Liu G, Liu J
Soil Health
If you've ever wondered whether pairing a fruit tree with vegetables actually helps or just competes for space, this study shows interplanting can boost nitrogen fixation and yield rather than fighting over resources.
Researchers grew soybeans either alone or alongside mulberry trees and found the soybeans formed more nitrogen-fixing nodules, made more of the enzyme that captures nitrogen, and grew bigger when the two plants' roots could mingle freely in the soil. The mulberry wasn't just a passive neighbor either: using a nitrogen tracer, scientists found the tree's roots, stems, and leaves absorbed nitrogen that had been applied to the soybean's side of the pot. Letting roots fully intermingle also shifted the mix of helpful soil bacteria, fungi, and plant chemicals around both species' roots.
Key Findings
Full-contact mulberry-soybean intercropping increased soybean nodule number by 12.3%, nitrogenase activity by 21.6%, nitrogen accumulation by 9.1%, and shoot dry weight by 26.5% compared to soybean grown alone.
Key nodulation genes GmNIN and GmENOD40 were 2.60-fold and 2.22-fold more active in intercropped soybeans than in monoculture soybeans.
Nitrogen-15 tracer applied to the soybean side of the soil was recovered in mulberry roots, stems, and leaves, and land equivalent ratios exceeded 1 in both intercropping setups, meaning the combined system outproduced growing each plant alone.
chevron_right Technical Summary
Planting mulberry trees and soybeans together helps the soybeans form more root nodules and fix more nitrogen, while the mulberry secretly picks up some of that nitrogen for itself. This kind of tree-crop pairing could let farmers grow more food on the same land.
Abstract Preview
Original paper
Mulberry-soybean intercropping reshapes rhizosphere metabolites and microbiota alongside enhanced soybean nodulation.
Woody perennial-legume intercropping may improve nitrogen-use efficiency, but the belowground links among root-zone configuration, soybean nodulation, rhizosphere chemistry, microbial assembly and ...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Morus, a genus of flowering plants in the family Moraceae, consists of 19 species of deciduous trees commonly known as mulberries, growing wild and under cultivation in many temperate world regions. Generally, the genus has 64 subordinate taxa, though the three most common are referred to as whit...