Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Autor(es)

Pessinatti Ohashi, Augusto Yukitaka ^[1] ; de Matos Pires, Regina Celia ^[1] ; Ribeiro, Rafael Vasconcelos ^[2] ; Barros de Oliveira Silva, Andre Luiz ^[1]

Afiliação do(s) autor(es)

^[1] Agron Inst IAC, Ctr Res & Dev Ecophysiol & Biophys, BR-13075630 Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Inst Biol, Dept Plant Biol, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Bragantia; v. 74, n. 2, p. 131-138, APR-JUN 2015.
• Citações Web of Science: 5

Resumo

Despite of the agronomic importance for water management, few studies of sugarcane roots have been performed under field conditions during the crop cycle. The aim of this study was to determine the cumulative root density (LA), root distribution on soil profile and the effective rooting depth (ERD) for three sugarcane cultivars using the minirhizotron method. A field experiment was done with sugarcane cultivars IACSP94-2094, IACSP94-2101 and SP79-1011 grown under subsurface drip fertigation. Soil chemical and physical characteristics were also evaluated. Root evaluations were taken at 38, 58, 123, 185 and 205 days during the second ratoon, considering the soil profile until 0.8 m depth. The highest LA and root growth rates were found up to 0.4 m soil layer for all cultivars. Root growth rate varied during the crop cycle, with the highest values being found between 38 and 58 days after ratoon (DAR). There was a genotypic variation in root growth, with IACSP94-2101 showing the highest LA of 12.9 mm cm(-2). The total root length observed around the tube (0.16892 m(2)) was 10.8, 5.9 and 2.5 m up to 0.8 m depth for IACSP94-2101, SP79-1011 and IACSP94-2094, respectively at 205 DAR. The effective rooting depth varied during the cycle for IACSP94-2094, but all cultivars presented an effective depth of 0.4 m at 205 DAR. (AU)

• Processo FAPESP: 10/52139-4 - Monitoramento do ambiente e modelagem do potencial genético de cultivares de cana-de-açúcar em condições adequadas de disponibilidade hídrica do solo
• Beneficiário: Regina Celia de Matos Pires
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 11/16174-2 - Desenvolvimento e distribuição do sistema radicular de quatro variedades de cana-de-açúcar irrigada por gotejamento subsuperficial
• Beneficiário: Augusto Yukitaka Pessinatti Ohashi
• Modalidade de apoio: Bolsas no Brasil - Mestrado