Skip to main content
SLU:s publikationsdatabas (SLUpub)

Forskningsartikel2021Vetenskapligt granskadÖppen tillgång

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

Li, Shoujiao; Jensen, Erik Steen; Liu, Nan; Zhang, Yingjun; Dimitrova Martensson, Linda-Maria

Sammanfattning

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.

Nyckelord

symbiotic N-2 fixation; apparent transfer of N; intercropping advantages; interspecific interactions; intermediate wheatgrass; white clover; service crop

Publicerad i

Agronomy
2021, Volym: 11, nummer: 2, artikelnummer: 388
Utgivare: MDPI

      SLU författare

      • Associerade SLU-program

        Framtidens lantbruk (tom Jan 2017)

        Globala målen

        SDG15 Skydda, återställa och främja ett hållbart nyttjande av landbaserade ekosystem, hållbart bruka skogar, bekämpa ökenspridning, hejda och vrida tillbaka markförstöringen samt hejda förlusten av biologisk mångfald
        SDG2 Avskaffa hunger, uppnå tryggad livsmedelsförsörjning och förbättrad nutrition samt främja ett hållbart jordbruk
        SDG12 Säkerställa hållbara konsumtions- och produktionsmönster

        UKÄ forskningsämne

        Jordbruksvetenskap

        Publikationens identifierare

        DOI: https://doi.org/10.3390/agronomy11020388

        Permanent länk till denna sida (URI)

        https://res.slu.se/id/publ/111134