Dados do Trabalho

Título

SPORES NUMBER OF MYCORRHIZAL ARBUSCULAR FUNGI IN ONION NO-TILLAGE SYSTEM WITH DIFFERENT CROP ROTATIONS

Resumo

The soil spores number of Arbuscular Mycorrhizal Fungi (AMF) is related to the mycotrophic character of the cultivated species and this is intensified in the no-tillage vegetable system (NTVS) with the use of plant rotation. Aiming to evaluate the effect of different rotations used in NTVS on the number of AMF spores, we carried out a study with different rotations 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 cultivated for four years. The treatments were rotations 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, respectively. Soil (0-10 cm) was collected at winter plant flowering (July) and onion bulbing (October) in 2022 for spore counts after wet sieving extraction. 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, respectively). During onion cultivation, 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 cultivation recovered the number of the propagules in the soil. Mycotrophic crops increase AMF spores number in an onion no-tillage system.

Palavras-chave

AMF; Allium cepa; Cover crops; Mycotrophic; NTVS.

Instituição financiadora

CNPq, FAPESC.

Agradecimentos

CNPq, EPAGRI, FAPESC, PPGRGV.