03057nab a2200361 i 4500003000900000005001700009008004100026040001800067072001400085072000800099100003800107100002900145100003200174100002700206100002700233100002600260100003000286100003200316245011200348500007000460520174500530650000902275650002202284650001402306650001802320650002602338650001902364650002302383773018302406856007902589942000802668999001902676BR-BrBNA20250512150637.0250512b2020    bl.mr|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aP34b0336  aP33  aPires, Maria de Fátima Marques   aMedeiros, João Carlos   aSouza, Henrique Antunes de   aRosa, Jaqueline Dalla   aBoechat, Cácio Luiz   aMafra, Álvaro Luiz   aNolêto, Kyvia Corrêa   aRocha, Angélica Gomes da   aConservation system improves soil microbial quality and increases soybean yield in the Northeastern Cerrado  aPublicação on-line; 39 ref.; 3 illus; 4 tables; Sumaries (En)  a

ABSTRACT: The conservation tillage systems is based on the surface protection by crop residue and reduced soil disturbance. These two principles can favor the soil quality and promote sustainable agricultural systems. The study was developed with the objective of measure soil microbial biomass, soil basal respiration, enzymatic activity and soybean yield in conservation systems cultivated with cover crops species in the Northeastern Cerrado. The experiment was carried out in 2016/2017 and 2017/2018 cropping seasons, performed in a randomized blocks design. The treatments were soil tillage systems allocated in the main plots: no-tillage (NT) and minimum tillage (MT) and the cover crops were allocated in the subplots: Pennisetum glaucum (millet), Urochloa ruziziensis (brachiaria), Crotalaria spectabilis (C. spectabilis), Crotalaria ochroleuca (C. ochroleuca), Pennisetum glaucum + Crotalaria spectabilis (millet + C. spectabilis) and spontaneous plants with three replicates. The evaluated variables were dry mass (DM) production and nutrient accumulation in cover crops; soil biological properties, namely microbial biomass carbon and nitrogen (MBC and MBN, respectively), respiration, metabolic quotient (qCO2 ), dehydrogenase enzymatic activity (DH), fluorescein diacetate (FDA); and soybean yield. The higher production of dry mass and nutrient cycling occurs with the intercropping millet + C. spectabilis and single millet. The highest soybean yield occurs in succession to C. ochroleuca and intercropping of the millet + C. spectabilis. Cover crops in conservation systems improve soil microbial quality and increase soybean yield.

Key words: Glycine max L., soil quality, no-tillage, nutrient cycling, microbial biomass  aSOJA  aANÁLISE DO SOLO  aQUALIDADE  aMICROBIOLOGIA  aPRODUTIVIDADE DO SOLO  aPLANTIO DIRETO  aSISTEMA DE CULTIVO0 013659344638dCampinas-SP Instituto Agronômico - Coordenadoria da Pesquisa Agropecuária 1941o2024-4960tBragantia (Brazil)x0006-8705gv. 49 p. 474-486; (2020)wBR2025001051  uhttps://www.scielo.br/j/brag/a/tNkv4Y3bzcmQz5bsdktML6M/?format=pdf&lang=en  cANA  c331434d331434