Data/hora: 01/07/2024 14:49:53

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	09/10/2020	
Data da última atualização: 	09/10/2020	
Autoria: 	GIUMBELLI, L. D.; LOSS, A.; VENTURA, B. S.; SANTOS JÚNIOR, E.; ALMEIDA, J.; PICCOLO, M. C.; MAFRA, Á. L.; KURTZ, C.; BRUNETTO, G.; COMIN, J. J.	
Título: 	Aggregation index, carbon, nitrogen, and natural abundance of 13C and 15N in soil aggregates and bulk soil cultivated with onion under crop successions and rotations.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Soil Research, Clayton South, Australia, p. 1-14, 2020.	
Idioma: 	Inglês	
Conteúdo: 	Use of soil cover crops of different families in crop rotation or succession under no-tillage system (NTS) for
onion production results in higher soil quality compared to land use systems with less plant diversity. The objective was
to evaluate the effect of using different combinations of plant species from different botanical families in rotation and
succession of soil cover crops in NTS for onion production on formation of macroaggregates, mesoaggregates, and
microaggregates, and on total organic C (TOC) and N (TN) contents, including isotopic forms of C and N, in soil
aggregates and bulk soil. The treatments (T) evaluated were maize/onion (NTS-T1); cover plants (winter)/onion (NTST2); 
maize/winter grasses/onion (NTS-T3); velvet bean/onion (NTS-T4); millet/cover plants (winter)/onion (NTS-T5);
velvet bean/rye/onion (NTS-T6); maize/onion in conventional tillage system (CTS-T7); and intercrop cover plants
(summer)/onion (NTS-T8). We evaluated macroaggregates (8.0?0.25 mm), microaggregates (<0.25 mm), and bulk soil
(<2.0 mm) at depths of 0?5, 5?10, and 10?20 cm, in a nine-year field experiment. The greater plant diversity in T2?T6
and T8 resulted in higher geometric mean diameter (GMD) of aggregates compared to T1 and T7. The T8 was more
efficient in increasing GMD in the 10?20 cm soil depth than the other treatments. The T1 was more efficient in
improving the evaluated soil physical and chemical attributes than T7. The use of NTS with plants of the Poaceae and
Fabaceae families in single or intercrop systems for onion production resulted in higher TOC and TN contents in the 0?5
and 5?10 cm soil depths compared to CTS. Isotope 15N measurements showed that C and N were more protected in
microaggregates in all evaluated treatments and depths compared to macroaggregates and bulk soil. Macroaggregates
had more TOC and TN than microaggregates	
Palavras-Chave: 	conventional tillage system; macroaggregates and microaggregates; natural abundance of 15N; no-tillage system; onion production; soil cover plants.	
Categoria do assunto: 	A Sistemas de Cultivo	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_46733.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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