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  • Author or Editor: Amon G. Mhaka x
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Increased plant population and a decrease in rectangularity (arrangement of plants in a more uniform or square pattern) have resulted in increased yield of bush beans (Phaseolus vulgaris L.) (Atkin, 1961; Goulden, 1976; Jones, 1969; Mack and Hatch, 1968). Mack and Hatch (1968) reported an average yield increase of 17% for two bush green bean cultivars in a 15-cm-square arrangement (rectangularity of 1:1), as compared with plants in 91-cm rows (rectangularity of 1:36). Double rows were not evaluated. Kueneman et al. (1979) found that narrow-row planting of dry beans produced higher yields than wider rows, but there was no difference in yield between double rows 10 cm apart as compared with single rows of 38 and 76 cm. It may be impractical to plant accurately in a square arrangement of 15 × 15 cm, for example, compared to wider rows, and this type of planting may result in higher incidence of white mold (Sclerotinia sclerotiorum) disease (Steadman et al., 1973).

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