Comparison of the hybrid performance of maize inbred lines developed from the original and improved cycles of BSSS

Russell, W.A.

Maydica 30(4): 407-419


ISSN/ISBN: 0025-6153
Accession: 001322872

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Inbreds B14A and B37, developed from the original BSSS (Iowa Stiff Stalk Synthetic) population, and B73 and B84, developed from selection cycles C5 and C7 of BSSS, respectively, were crossed with the inbred tester Mo17 and evaluated for hybrid performance with respect to (1) 18 plant, ear and grain traits, and (2) yield responses to combined treatments involving 3 plant densities and 4 N fertilizer rates. The order of grain yield, averaged over 33 site-year environments was B84 > B73 > B37 > B14A, differences being 12.6, 8.9 and 7.8%, respectively. Yield increases were associated with improvements in days to black layer formation, plant weight, rate of grain filling, ear diameter and harvest index. The linear X linear component of hybrid X plant density X N rate interaction was highly significant. Responses to N rate were dependent on plant density, and the combined effects of the 2 treatments varied among the hybrids. The newer hybrids were superior to the older hybrids at all N rates, and their advantage was greatest at the highest N rate.