02740naa a2200253 a 450000100080000000500110000800800410001910000160006024501000007626000090017652019170018565000160210265000190211865000160213765000090215365000200216270000220218270000220220470000250222670000140225170000170226570000180228277301860230011340512023-12-11       2023    bl uuuu     u00u1 u    #d1 aVAES, L. M.  aSOIL CHEMICAL ATTRIBUTES IN LONG-TERM ONION NO-TILLAGE VEGETABLE SYSTEM.h[electronic resource]  c2023  aThe use of cover crops, essental for a no-tllage vegetable system (NTVS), modifes soil chemical atributes. This study sought to evaluate how different winter cover crops affect soil chemical atributes in the onion NTVS conducted for ten years. The work was conducted in an experimental area in the municipality of Ituporanga (SC) that has had onion NTVS since 2009. The treatments were black-oats (BO) (Avena strigosa) single, oilseed-radish (OR) (Raphanus satvus) single, BO+OR intercropped and fallow (weeds) in winter, followed by onion (Allium cepa) in spring and velvet-bean (Mucuna aterrima) in summer, in a randomized block design. Afer onion cultvaton in 2010, 2015 and 2020 soil samples (0-10 cm) were collected for chemical characterizaton: pH (H2O), organic-mater (OM), P and K+ (Mehlich-1), Ca2+, Mg2+, Al3+, potental acidity, caton exchange capacity (CEC), base sum (SB) and base saturaton. There was no difference among treatments, only in the years, except for K+ and Al3+ which did not differ between the factors and ranged from 224-760 mg dm-3 and 0-0.02 cmolc dm-3. In 2010 and 2015, pH increased from 5.6 to 6.3, P from 80.3 to 130.7 mg dm-3; Ca from 5.7 to 8.9 cmolc dm-³, CEC from 15.1 to 16.4 cmolc dm-3, base saturaton from 68 to 79% and SB from 10.2 to 12.9 cmolc dm-³, and not differ between 2015 and 2020. From 2010 to 2015, there was a reducton in potental acidity (4.9 to 3.6 cmolc dm-3) and Mg2+ (3.2 to 2.7 cmolc dm-³), values were maintained in 2020. OM, P and Ca2+ decreased between 2015 and 2020, from 4.1 to 3.6%; 130.7 to 107.6 mg dm-3; 8.9 to 8.4 cmolc dm-3, respectvely. The use of onion NTVS increases pH, P, Ca2+, CEC, V% and SB and reduces soil potental acidity from fve years of management. The reducton of P and Ca between 2010 and 2015, is related to the non-practce of fertlizaton of the area due to the high nutritonal contents found.  aAllium cepa  aAvena strigosa  aCover crops  aNTVS  aRaphanus satvus1 aGIOVANETTI, L. K.1 aLANZENDORF, D. Z.1 aZIMMERMANN, M. L. S.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. 433