Least-limiting water range of the soil seedbed submitted to mechanical and biological chiselling under no-till

Autor(es)

Guedes Filho, O. ^[1] ; da Silva, A. P. ^[2] ; Giarola, N. F. B. ^[3] ; Tormena, C. A. ^[4]

Afiliação do(s) autor(es)

^[1] UFMT, BR-78735901 Rondonopolis, MT - Brazil

^[2] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[3] Univ Estadual Ponta Grossa, Dept Ciencias Solo & Engn Agr, BR-84030900 Ponta Grossa, PR - Brazil

^[4] Univ Estadual Maringa, Dept Agron, BR-87020900 Maringa, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SOIL RESEARCH; v. 52, n. 6, p. 521-532, 2014.
• Citações Web of Science: 3

Resumo

Physical quality of the soil seedbed affects germination, seedling emergence and crop establishment. The aim of this work was to determine the least-limiting water range (LLWR) of a soil seedbed cultivated for 18 consecutive years under no-till (NT) and submitted to mechanical chiselling (NT-M) and biological chiselling by a forage radish cover crop (NT-B). The study was carried out in Ponta Grossa, Parana, Brazil. The experimental design was randomised complete blocks with four replications. Soil samples at 0-5 and 5-10 cm depths were collected at 6 and 18 months after the start of the experiment which corresponded to maize (October 2009) and soybean (November 2010) planting. Water-retention curve, penetration-resistance curve, soil and relative bulk density, and LLWR were determined. Bulk density did not differ among treatments at 0-5 cm depth for both evaluation periods. At 5-10 cm soil depth, the NT-M treatment showed the lowest bulk density at the first sampling (2009), whereas NT-B showed the highest bulk density at the second sampling (2010). Soil penetration resistance was the most limiting factor of the LLWR, which was greater in NT-M for both soil layers at the first sampling. At the second sampling, the NT treatment had the greatest LLWR at 0-5 cm, but at 5-10 cm soil depth, both NT and NT-M had higher LLWR than NT-B. The efficiency of mechanical chiselling in improving soil seedbed physical quality lasted 18 months after its application. Biological chiselling was efficient in improving soil air-filled porosity in both periods as evaluated by the LLWR. (AU)

• Processo FAPESP: 09/12106-2 - Qualidade física do solo da cama de semeadura em culturas sob sistema plantio direto
• Beneficiário: Osvaldo Guedes Filho
• Modalidade de apoio: Bolsas no Brasil - Doutorado