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Species Interactions and Nitrogen Use during Early Intercropping of Intermediate Wheatgrass with a White Clover Service Crop

Li, Shoujiao and Jensen, Erik Steen and Liu, Nan and Zhang, Yingjun and Dimitrova Mårtensson, Linda-Maria (2021). Species Interactions and Nitrogen Use during Early Intercropping of Intermediate Wheatgrass with a White Clover Service Crop. Agronomy. 11 , 388
[Research article]

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Abstract

Perennial grain crops intercropped with legumes are expected to use nitrogen (N) resources efficiently. A pot experiment using the N-15 isotope dilution method demonstrated interspecific competition and use of N from the soil and N-2 fixation in intermediate wheatgrass (Thinopyrum intermedium (Host) Barkworth & D.R. Dewey, IWG) and white clover (Trifolium repens L., WC) intercrops at five species-relative frequencies and four levels of inorganic N fertilizer in a replacement series design. The proportion of N in WC derived from the atmosphere increased from 39.7% in a sole crop to 70.9% when intercropped with IWG, and 10.1% N in IWG transferred from WC. Intermediate wheatgrass showed high fitness with maintained high total dry matter production at low relative frequencies. Decreasing IWG-relative frequency only increased dry matter and N accumulation of WC, resulting in increased amounts of N-2 fixed. Increased levels of N fertilization increased the proportion of N acquired from the fertilizer in IWG and WC but decreased the N fixed by WC and N absorbed by IWG from the soil. Our study indicates that WC supply sufficient fixed N-2 for IWG intercrop biomass yields under appropriate levels of soil N fertility and species-relative frequencies.

Authors/Creators:Li, Shoujiao and Jensen, Erik Steen and Liu, Nan and Zhang, Yingjun and Dimitrova Mårtensson, Linda-Maria
Title:Species Interactions and Nitrogen Use during Early Intercropping of Intermediate Wheatgrass with a White Clover Service Crop
Series Name/Journal:Agronomy
Year of publishing :2021
Volume:11
Article number:388
Number of Pages:17
Publisher:MDPI
ISSN:2073-4395
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:symbiotic N-2 fixation, apparent transfer of N, intercropping advantages, interspecific interactions, intermediate wheatgrass, white clover, service crop
URN:NBN:urn:nbn:se:slu:epsilon-p-111134
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111134
Additional ID:
Type of IDID
DOI10.3390/agronomy11020388
Web of Science (WoS)000621992300001
ID Code:22826
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Biosystems and Technology (from 130101)
Deposited By: SLUpub Connector
Deposited On:23 Mar 2021 09:03
Metadata Last Modified:23 Mar 2021 09:11

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