Crop Science Grow Your Career with CSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Crop Sci 9:47-50 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Hallauer, A. R.
Right arrow Articles by Sears, J. H.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Hallauer, A. R.
Right arrow Articles by Sears, J. H.
Agricola
Right arrow Articles by Hallauer, A. R.
Right arrow Articles by Sears, J. H.

Mass Selection for Yield in Two Varieties of Maize1

Arnel R. Hallauer and J. H. Sears2

Two open-pollinated varieties of maize (Zea mays L.), ‘Krug’ and ‘Iowa Ideal,’ have been under mass selection for yield. Yield evaluations of the original and six cycles of selection in Krug and five cycles in Iowa Ideal have been completed. The preliminary results do not show significant improvement of yield in either Krug or Iowa Ideal by mass selection.

on cycles of selection for each variety. The regression equation showed, on the average, a small increase in yield for the successive cycles of selection. However, the coefficients of regression (b = .76 for Krug and b = .69 for Iowa Ideal) were not significantly different from zero. The sum of squares due to regression was not significantly different from the deviation mean square in either analysis. The average yields for the original and successive cycles of selection were erratic. Four years of testing showed no increase in Krug after three cycles; on the basis of 1 year's test, only 3% gain was noted after six cycles. A 5% gain was obtained in Iowa Ideal after three cycles. In the fifth cycle of Iowa Ideal, a decrease in yield was observed in the 1 year's test.

Key Words: Zea mays L. • Population improvement • Intrapopulation selection • Open-pollinated varieties • Variability • Individual selection

1 Contribution from the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, and the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture cooperating. Journal Paper no. J-5959 of the Iowa Agr. and Home Econ. Exp. Sta. Project no. 1575.

2 Research Geneticist, ARS, USDA, and Agriculture Research Technician, respectively, Ames, Iowa 50010.

Received for publication June 12, 1968.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1969 by the Crop Science Society of America.