CHARACTERS ASSOCIATED WITH YIELD STABILITY OF IRISH POTATO GENOTYPES IN GEORGIA

• Published in: HortScience Vol. 25; no. 9; p. 1173
• Main Authors: Bhardwaj, H.L, Bhagsari, A.S, Haynes, K.G
• Format: Journal Article
• Language: English
• Published: 01.09.1990
• ISSN: 0018-5345; 2327-9834
• DOI: 10.21273/HORTSCI.25.9.1173a

Three experiments, each with 100 potato (Solanum tuberosum L.) genotypes, were conducted using triple lattice designs from 1988-1989. The use of lattice designs did not improve the efficiency of these experiments over randomized complete blocks. The phenotypic stability of tuber yields of 91 genotypes, common to three experiments, was measured by regression of genotype means over environmental means. Regression coefficients indicated that 60 days after planting (DAP), genotypes adapted to high yielding environments (b > 1), had significantly higher tubers/plant, leaf area index, and yield/plant, as compared to genotypes suited to low-yielding environments. At final harvest, approximately 100 DAP, genotypes specifically adapted to high yielding environments had significantly higher tubers/plant and yield/plant than genotypes adapted to low yielding environments (b < 1). Green Mountain, Kennebec, and Norchip were adapted to high-yielding environments whereas La Chipper, Ontario, and Superior were adapted to low-yielding environments.