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  1. Vol. 22 No. 3, p. 560-564
     
    Received: May 29, 1981
    Published: May, 1982


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doi:10.2135/cropsci1982.0011183X002200030030x

Efficiency of Yield Selection in Cassava Populations under Different Plant Spacings1

  1. Kazuo Kawano,
  2. Charn Tiraporn,
  3. Somsak Tongsri and
  4. Yoshiaki Kano2

Abstract

Abstract

Cassava (Manihot esculenta Crantz) genotypes were evaluated in a high productivity environment for single-plant root yield and harvest index (proportion of root weight to total plant weight) in segregating populations and single-row trials at different plant spacings and for unit-area yield in a replicated large-plot trial to assess efficiency of selection. Broad-sense heritability for single-plant yield in segregating populations was much higher than that for harvest index irrespective of spacing. The correlation of single-plant yield in segregating populations with unit-area yield was invariably lower than that of harvest index with unit-area yield. Thus, harvest index is a better selection criterion than single-plant yield in segregating populations or in single-row trials when the final selection objective is unit-area yield. Intergenotypic competition appeared to be the major cause for a low correlation between single-plant yield and unit-area yield. Spacing of 1 × 2 m in segregating populations and a distance of 2 m between rows in single-row trials were more efficient than other spacings.

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