MILLET (BRASSICA NAPUS L.) ROTATION MODEL PROMOTED THE YIELD OF MILLET BY IMPROVING THE FUNGAL COMMUNITY STRUCTURE IN DRYLANDS IN CHINA

Author:YU, G. H. – LIU, P. C.– LU, G. L.– GUO, A. Q.– HAO, H. B.– ZHOU,J.– LI, M. Z.
Published:2022
Abstract:

Plant-crop rotation model plays an important regulatory role in effectively avoiding the
      occurrence of continuous cropping obstacles in drylands. However, it is not clear how fungal communities
      change in soils with some different rotation models. To solve this question, we determined the soil nutrient
      contents, and compared the composition of fungi from soils (0-20 cm) using fungal ITS pyrosequencing
      techniques. We also tested different crop rotation regimes, including Triticum aestivum L. and millet
      rotation (TaSi), small rye (Triticale Secalotriticum) and millet rotation (TsSi), one season of leisure (no any
      crop) and one season of millet (Si), rape (Brassica napus L.) and millet rotation (BnSi). The results showed
      that BnSi significantly improved soil available potassium contents, the activity of soil catalase, and yields
      of Setaria italica, while reduced soil Alkali-hydrolyzed nitrogen contents compared with other three groups.
      Fungal alpha-diversity index in BnSi was the highest. The relative abundances of Ascomycota in BnSi
      (61.53%) and TsSi (62.6%) were higher than that in Si (58.65) and TaSi (55.67%), while Basidiomycota
      exhibited the opposite trend. Available potassium and organic matter were significant factors affecting
      fungal communities, explaining 61.4% of total variation. Our findings shed new light on the response of
      the soil fungal communities to long-term green manure regimes.

Key words:Setaria italica, green manure, crop rotation model, soil nutrient, ITS pyrosequencing