Elsevier

Advances in Agronomy

Volume 26, 1974, Pages 177-210
Advances in Agronomy

Biomass Productivity of Mixtures

https://doi.org/10.1016/S0065-2113(08)60871-8Get rights and content

Publisher Summary

This chapter focuses on biomass productivity of mixtures and provides a comparison of the biomass yields of mixtures with those of their components'. It discusses the types of interaction causing non-transgressive deviations of mixture yields from mid-monoculture values. The chapter discusses mechanisms causing transgressive deviation that ensure that the yield of the mixture is either less than that of the lower-yielding monoculture or more than that of the higher-yielding monoculture. Most binary mixtures have been recorded as yielding at a level between the yields of the components' monoculture. This non-transgressive yielding can be predicted on the assumption of competition among components for the same resources. Such competition leads to equal proportional increases and decreases of plant biomass compared with per-plant performance of the components in monocultures.

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    Present address: Research School of Biological Sciences, Australian National University, Canberra City, Australia.

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