Li, Shoujiao
- Institutionen för biosystem och teknologi, Sveriges lantbruksuniversitet
Forskningsartikel2021Vetenskapligt granskadÖppen tillgång
Li, Shoujiao; Jensen, Erik Steen; Liu, Nan; Zhang, Yingjun; Dimitrova Martensson, Linda-Maria
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.
symbiotic N-2 fixation; apparent transfer of N; intercropping advantages; interspecific interactions; intermediate wheatgrass; white clover; service crop
Agronomy
2021, Volym: 11, nummer: 2, artikelnummer: 388
Utgivare: MDPI
Framtidens lantbruk (tom Jan 2017)
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
Jordbruksvetenskap
DOI: https://doi.org/10.3390/agronomy11020388
https://res.slu.se/id/publ/111134