Deep subsoiling of a subsurface-compacted typical hapludult under citrus orchard

Revista Brasileira de Ciência do Solo

João Carlos Medeiros¹  Getulio Coutinho Figueiredo²  Álvaro Luiz Mafra¹  Jaqueline Dalla Rosa¹  Sung Won Yoon¹ 

[1] ,University of São Paulo ESALQ Piracicaba SP ,Brazil

关键词: soil compaction;    soil management;    soil physics;    subsoiler;    compactação do solo;    manejo do solo;    física do solo;    subsolador;   

DOI  :  10.1590/S0100-06832013000400008

来源: SciELO

【 摘 要 】

Soil management practices which increase the root depth penetration of citrus are important to the longevity and yield maintenance of this plant, especially in regions where long periods of drought are common, even in soil conventionally subsoiled to a depth of 30-40 cm, when the orchard was first established. The objective of this study was to evaluate the efficiency of subsoiling on the physical and hydric properties of a Typical Hapludult and fruit yield in a 14-year-old citrus orchard located in Piracicaba, SP. The treatments consisted of: no-subsoiling (with no tilling of the soil after the orchard was planted); subsoiling on one side of the plant lines (SUB. 1); and subsoiling on both sides of the plant lines (SUB. 2). The subsoiling treatments were carried out 1.5 m from the plant lines and to a depth of 0.8 m. Soil samples were taken 120 days after this operation, at four depths, in order to determine physical and hydric properties. Fruit yield was evaluated 150 days after subsoiling. Subsoiling between the plant lines of an old established citrus orchard alters the physical and hydric properties of the soil, which is reflected in increased soil macroporosity and unsaturated hydraulic conductivity, and reduced soil bulk density, critical degree-of-compactness and penetration resistance. The improvements in the physical and hydric properties of the soil were related to an increase in fruit number and orchard yield.

【 授权许可】

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