02679naa a2200253 a 450000100080000000500110000800800410001910000250006024501310008526000090021652018400022565000160206565000080208165000160208965000160210565000090212170000220213070000220215270000160217470000140219070000170220470000180222177301860223911340532023-12-11       2023    bl uuuu     u00u1 u    #d1 aZIMMERMANN, M. L. S.  aSPORES NUMBER OF MYCORRHIZAL ARBUSCULAR FUNGI IN ONION NO-TILLAGE SYSTEM WITH DIFFERENT CROP ROTATIONS.h[electronic resource]  c2023  aThe soil spores number of Arbuscular Mycorrhizal Fungi (AMF) is related to the mycotrophic character of the cultvated species and this is intensifed in the no-tllage vegetable system (NTVS) with the use of plant rotaton. Aiming to evaluate the effect of different rotatons used in NTVS on the number of AMF spores, we carried out a study with different rotatons of winter and summer crops and onion in spring. The experiment was conducted in an experimental area of EPAGRI in Ituporanga, SC, with the same sequence of species cultvated for four years. The treatments were rotatons of black-oats (BO)/onion/velvet-bean, BO/onion/ soybean; oilseed-radish (OR)/onion/velvet-bean, OR/onion/millet, BO+OR/onion/common-beans, BO+OR/ onion/velvet-bean, fallow (weeds)/onion/maize and fallow/onion/velvet-bean in winter/spring/summer, respectvely. Soil (0-10 cm) was collected at winter plant flowering (July) and onion bulbing (October) in 2022 for spore counts afer wet sieving extracton. At the end of the winter cover crops, the fallow/onion/ maize showed the highest number of spores (245 spores per 50 cm3 of soil), higher than BO/onion/soybean and fallow/onion/velvet-bean. The treatments with the presence of oilseed-radish (a species that does not associate with AMF) in this period showed the lowest numbers of spores (77; 72 and 82 per 50 cm3 of soil for OR/onion/velvet-bean, OR/onion/millet and BO+OR/onion/velvet-bean, respectvely). During onion cultvaton, the spores number of AMF did not differ among treatments and varied from 94 to 145 spores per 50 cm3 of soil. The Fallow and BO increased the spores number of AMF, while OR reduced it, but subsequent onion cultvaton recovered the number of the propagules in the soil. Mycotrophic crops increase AMF spores number in an onion no-tllage system.  aAllium cepa  aAMF  aCover crops  aMycotrophic  aNTVS1 aGIOVANETTI, L. K.1 aLANZENDORF, D. Z.1 aVAES, L. M.1 aKURTZ, C.1 aCOMIN, J. J.1 aLOVATO, P. E.  tIn: CONGRESSO LATINO-AMERICANO DE CIÊNCIA DO SOLO, 23., CONGRESSO BRASILEIRO DE CIÊNCIA DO SOLO, 38., 2023, Florianópolis, SC. Resumos... Florianópolis, SC: Epagri, 2023. p. 230