In the land of plenty

Autor: Florian Wichern, Christian Fritz, Dina in ‘t Zandt
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Plant and Soil, 423(1-2), 549-562. SPRINGER
Plant and Soil, 423, 1-2, pp. 549-562
Plant and Soil, 423, 549-562
ISSN: 1573-5036
0032-079X
Popis: Catch crops (CC) reduce nitrate leaching, and may resolve a major concern in nitrogen (N) intensive agriculture. CC efficiency depends on N uptake ability, which is related to root development, biomass partitioning, and competition with soil microbes. We investigated the effect of N addition on this with three CC species.Three CC species were grown in pots with three N concentrations. Shoot and root biomass, C:N content, and specific root length were determined, whereas residual N, dissolved organic N (DON) and C, and microbial biomass N and C were measured.Addition of N did not consistently effect plant biomass nor its partitioning, probably because of overall high N. However, CC did reduce residual N, and so did soil microorganisms, likely facilitated by C-release from roots. Moreover, plant presence reduced DON, likely through uptake by soil microorganisms, partly followed by plant uptake.CC not only take up residual N themselves, but also trigger considerable N uptake by soil microorganisms that thrive on C-release from roots. This plant-microbe-nitrogen interaction has to be considered when evaluating CC systems. It remains unclear to which extent soil microorganisms immobilise inorganic N and mineralise or take up DON.
Databáze: OpenAIRE
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