Interactions of Maize Hybrids with Tillage Systems1
- K. E. Newhouse and
- T. M. Crosbie2
The use of conservation tillage for commercial production of maize (Zea mays L.) has expanded substantially in the past 10 yr. Few previous studies have compared the relative performance of a large number of hybrids in no-tillage and conventional tillage cropping systems. In this study, 60 commercial hybrids were grown at two locations in Iowa in 1981 and 1982 to examine the interaction of commercial maize hybrids with no-tillage and conventional tillage systems. Hybrid ✕ tillage interactions were not significant for any of the seven traits examined in a combined analysis of variance over tillage systems. Hybrid ✕ tillage ✕ environment interactions were significant for percentage emergence and mature plant height. Rank correlations of hybrid means from one tillage system to the other were significant and large, ranging from 0.66 to 0.94 for the agronomic traits measured, which was consistent with the lack of significant hybrid ✕ tillage interactions. No specific traits were of more importance for performance in no-till than in conventional tillage. Also, no differential hybrid response to tillage systems, which was repeatable across environments, was observed. The study suggested that evaluation of performance in conventional tillage environments provided sufficient information to select among contemporary hybrids for use in conservation tillage environments.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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