Data/hora: 18/06/2024 23:23:32

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	22/11/2002	
Data da última atualização: 	13/09/2019	
Autoria: 	FARIA, J. C.; SCHAEFER, C. E. R.; RUIZ, H. A.; COSTA, L. M.	
Título: 	Effects of wees control on physical and micropedologia proporties of a Braziliam ultisol.	
Ano de publicação: 	1998	
Fonte/Imprenta: 	Revista Brasileira de Ciencia do Solo, Campinas, v.22, n.4, 731-741, 1998.	
Idioma: 	Português	
Conteúdo: 	In the tropical soil environment, raindrop impact is capable of disrupting natural soil aggregation and porosity, thus influencing the amount of anfiltrated water and is redistribution. Under such conditions, a vegetation cover of weeds cannot be viewed simply as a crop competitor. This research project was designed to examine, under field conditions, the changes of soil properties, namely soil water content, structure and sealing, resulting from diffetent types of weed management, with the aim of contributing to the establishment of more sustainable agricultural practices. Four weed management types - hoe-weeded, bare soil (combined application of pre-emergence herbicide Arsenal-250 (Imazapir) 2.0 L ha and the systemic herbicide Gliz (Glifosate) 5.0 L ha), cut and cut + herbicide (systemic herbicide Gliz (Gliofosate) 5.0 L ha) - were studied on an intensively cropped Kanhapludult in Minas Gerais State, Brazil. In high rainfall periods, the insulating effect of cut and cut + herbicide resulted in higher soil water, as compared to bare soil and hoe-weeded. On the otther hand, in dry periods, the bare soil and hoe-weeded covers presented higher soil water content than the cut and cut + herbicide. Based on macro and micropedological observations, a sealing effect up to 15 mm below the surface was observed in bare soil and hoe-weeded covers and was particularly well-sorted and stratifield in the latter. It is postulated that microerosional and microdepositional processes are involved in hoe-weeded sealing. These processes result from the breakdown of microaggregates, repacking the soil matrix. In the bare soil, the sealing was associated with physical alterations in the top layer, related to raindrop impact. Cut and cut + herbicide covers showed greater development of algae, bryophytes and worm activity in the soil surface. Based on the results obtained, the use of motorized cutters associated with herbibides appears to be a suitable alternative to hoeing and-weeding, reducing soil physical degradation and losses of water and soil in this particular environment.	
Thesagro: 	Podzólico Vermelho Amarelo.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (8665-1) - ADD - AP - -- -  -  - 1999.00000 - DIS