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    Development of maize single cross hybrids for tolerance to low phosphorus

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    Kisinyo et al AJPS 2012.pdf (441.8Kb)
    Date
    2015-08-21
    Author
    Gudu, Samuel
    Kisinyo, Peter
    Ouma, Evans Ochieng
    Ligeyo, Dickson
    Matonyei, Thomas
    Were, Beatrice Ang’iyo
    Agalo, Joyce
    Too, Emily
    Onkware, Augustino
    Okalebo, John
    Othieno, Caleb
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    Abstract
    Low available phosphorus (P) is one of the major hindrances to maize (Zea mays L.) productivity in acid soils. The objectives of this study were to: (1) develop P-efficient maize inbred lines, (2) develop single cross hybrids from the P-efficient inbred lines, and (3) determine their response to P application in the P-deficient acid soils of western Kenya. Ninety-eight inbred lines and 49 single crosses were developed and screened at P-deficient (2.0 to 2.2 mg P/kg soil) soils of Sega and Bumala. Mean grain yield (GY) for the hybrids was 75.3% higher with P-fertilizer than without P for the same hybrids. Thirty-three percent (33%) of these hybrids were inefficient but responsive to P application, 27% were efficient and none responsive, only 13% were efficient and responsive, while the rest were inefficient and non-responsive. GY was positively correlated (r = 0.57**) with plant height (PH) and ear height (EH) (r = 0.60**) and PH was correlated with EH (r = 0.86***). This study has developed and identified P-efficient maize germplasm that can be utilized directly or in developing other hybrids for use in acid soils of western Kenya and in other acid soils where P is limiting.
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    http://repository.rongovarsity.ac.ke/handle/123456789/455
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