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    Response of upland rice varieties to drought stress: II. Screening rice varieties by means of variable moisture regimes along a toposequence

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    Date
    1983
    Author
    Mambani, B.
    Lal, R.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    The effects of variable soil moisture regimes along a toposequence on root development, plant water status, and grain yield were investigated for ten rice varieties: (1) 63-83, (2) IB 43, (3) OS 6, (4) IB 6, (5) IR 1529-680-3, (6) C 22, (7) IRAT-13, (8) TOS 4680, (9) IET 1444 and (10) SE 302 G. The depth of water table below the soil surface in three regions along the toposequence was 100 (M1), 30 (M2) and 15 cm (M3). Soil moisture regime did not affect total root dry weight significantly. However, depth of root penetration did vary for the different moisture regimes and varieties investigated. The angle of root penetration was also affected by soil moisture regime. Roots of tall varieties (63-83, IB 6 and IRAT 13) penetrated deeper into the soil profile than short varieties. The pattern of soil moisture depletion was similar to that of root density profile. Relative water stress, expressed as a ratio of leaf water deficit under the M1 moisture regime to that under M3, increased exponentially with decrease in root density at a depth of 25 cm. The mean grain yield was 2.4, 1.9 and 1.4 t/ha for moisture regimes M3, M2 and M1, respectively. Although the grain yield of ten varieties exhibited normal distribution under an adequate soil moisture regime (M1), the distribution pattern changed under the adverse regime. Variety IB 6 and other tall varieties maintained stable yields under the adverse moisture regime. Grain yield was linearly related to root density at a depth of 25 cm.
    https://dx.doi.org/10.1007/BF02197758
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1878
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/BF02197758
    IITA Subjects
    Soil Fertility; Soil Information; Soil Surveys And Mapping
    Agrovoc Terms
    Soil Moisture; Agronomic Characters; Rice; Drought Stress; Toposequence
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Plant and Soil
    Collections
    • Journal and Journal Articles5283
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