Physical properties of a rhodic haplustox under two sugarcane harvesting systems

Revista Brasileira de Ciência do Solo

Walquíria Machado¹  Tiago Santos Telles²  João Tavares Filho²  Maria De Fátima Guimarães²  Grace Bungenstab Alves²  José Luiz Bernardo Borges² 

[1] ,Universidade Estadual de LondrinaLondrina PR

关键词: Saccharum officinarum;    soil bulk density;    porosity;    soil penetration resistance;    soil aggregate stability;    Saccharum officinarum;    densidade do solo;    porosidade;    resistência do solo à penetração;    estabilidade dos agregados;   

DOI  :  10.1590/S0100-06832010000600004

来源: SciELO

【 摘 要 】

This study had the purpose of evaluating the effects of two management types of sugarcane: harvesting of burnt cane (BCH) and mechanized harvesting of unburnt green cane (MCH), on some soil physical properties of a dystrophic Rhodic Haplustox. The data were then compared with results for the same soil type under native forest. A completely randomized design was used, with three treatments and 20 replications. The following characteristics were determined: organic matter, aggregate stability, soil bulk density, and porosity at depths of 0-0.20 m and soil penetration resistance. After 15 years of cultivation, there were some alterations in the soil under cane burnt before harvesting, evidenced by a drop in the weighted average diameter of stable aggregates in water and increased soil bulk density. Significant changes were also detected in total porosity and pore distribution under both harvesting systems. Critical values for penetration resistance were observed in the area under mechanized sugar cane harvesting, with a value of 4.5 MPa in the 40-55 cm layer. This value is considered high and could indicate compaction and restriction of root growth. Soil properties under the green cane (unburned) management system were closest to those of the soil under native forest.

【 授权许可】

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