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Efficiency of Yield Selection in Cassava Populations under Different Plant Spacings¹

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 x 2 m in segregating populations and a distance of 2 m between rows in single-row trials were more efficient than other spacings.

Key Words: Manihot esculenta Crantz • Harvest index • Single-row trial • Single-plant yield • Unit-area yield • Intergenotypic competition

² Plant breeder and postgraduate interns (present address: Hoey Pong Field Crop Exp. Stn., Rayong, Thailand; and Japan International Cooperation Agency, Shinjuku, Tokyo, Japan, respectively).

Received for publication May 29, 1981.

This article has been cited by other articles:

				K. Kawano Thirty Years of Cassava Breeding for Productivity--Biological and Social Factors for Success Crop Sci., July 1, 2003; 43(4): 1325 - 1335. [Abstract] [Full Text] [PDF]