Temporal Differentiation of Resource Capture and Biomass Accumulation as a Driver of Yield Increase in Intercropping.

Frontiers in Plant Science
Nadine EngbersenChristian Schöb

Abstract

Intercropping, i.e., the simultaneous cultivation of different crops on the same field, has demonstrated yield advantages compared to monoculture cropping. These yield advantages have often been attributed to complementary resource use, but few studies quantified the temporal complementarity of nutrient acquisition and biomass production. Our understanding of how nutrient uptake rates of nitrogen (N) and phosphorous (P) and biomass accumulation change throughout the growing season and between different neighbors is limited. We conducted weekly destructive harvests to measure temporal trajectories of N and P uptake and biomass production in three crop species (oat, lupin, and camelina) growing either as isolated single plants, in monocultures or as intercrops. Additionally, we quantified organic acid exudation in the rhizosphere and biological N2-fixation of lupin throughout the growing season. Logistic models were fitted to characterize nutrient acquisition and biomass accumulation trajectories. Nutrient uptake and biomass accumulation trajectories were curtailed by competitive interactions, resulting in earlier peak rates and lower total accumulated nutrients and biomass compared to cultivation as isolated single plants. Diffe...Continue Reading

References

Jan 13, 2012·The New Phytologist·Clare TrinderDavid Robinson
Apr 24, 2017·Current Opinion in Microbiology·Ruifu ZhangQirong Shen
Aug 26, 2020·Nature Ecology & Evolution·Malte JochumPeter Manning
Feb 26, 2021·Ecological Applications : a Publication of the Ecological Society of America·Laura StefanChristian Schöb

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