Breeding progress of grain and forage maize in long-term variety trials compared to on-farm yield development.

Theor Appl Genet · 2025 · PMC12612010 · PMID 41224944

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a negative trendno p-value reported

( 2020 ) who found no significant change for starch content and a negative trend for protein content.

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a positive trendno p-value reported

Furthermore, starch yield increased by 9.1 dt ha −1 or 14.0% while starch content did not change significantly but showed a positive trend of 1.7% (in absolute terms).

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