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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Guar root and shoot growth as affected by soil compaction

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Author(s):
Doglas Bassegio ; Marcos Vinicius Mansano Sarto ; Ciro Antonio Rosolem ; Jaqueline Rocha Wobeto Sarto
Total Authors: 4
Document type: Journal article
Source: Pesqui. Agropecu. Trop.; v. 48, n. 2, p. -, Abr. 2018.
Abstract

ABSTRACT Guar (Cyamopsis tetragonoloba L.) is commonly grown in arid lands, because of its high drought-tolerance. However, soil compaction may be a limiting factor to its growth. This study aimed to evaluate the guar growth, according to the soil penetration resistance (0.20 MPa, 0.33 MPa, 0.50 MPa, 0.93 MPa and 1.77 MPa, in a layer with depth between 0.15 m and 0.20 m), in a Rhodic Acrudox soil. The shoot and root dry mass, root length by the Q1/2 index (mechanical soil penetration resistance in which the root growth is reduced by 50 %) and root diameter were evaluated. The impairment of the guar shoot growth begins when the penetration resistance is greater than around 1 MPa. The soil compaction alters the distribution of guar roots in the soil profile, concentrating them in the 0.15 m layer, but it does not prevent roots from penetrating this layer and developing in depth. The root diameter increases in the compacted layer. A soil penetration resistance of up to 1.77 MPa does not influence the root length density below the compacted layer, as well as the total root length density of guar. Although the guar Q1/2 index is greater than 1.58, the shoot and root dry mass are impaired. (AU)

FAPESP's process: 16/14323-4 - Microbial activity in integrated eucalyptus and Urochloa
Grantee:Marcos Vinicius Mansano Sarto
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 14/10656-3 - Eucalyptus contribution for soil organic matter in integrated
Grantee:Marcos Vinicius Mansano Sarto
Support type: Scholarships in Brazil - Doctorate