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2019 Research Report to the Kentucky Corn Promotion Council 1Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546 each plot with a Dickey-John 2100 grain analysis computer from one year of data, the economic and agronomic Corn (Pioneer® 1197AM) was planted on April 29,

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Grain and Forage Center of Excellence

CORN SCIENCE

RESEARCH REPORT

2019

CONTENTS

Successfully Establishing Corn in Cover Crops: Year 2 ......... 1 Corn Starter Impacts Early Season Plant and Soil Properties .. 7 Effect of In-Furrow Fungicides on Corn Seedling Diseases and Yield ................................................................... 13 Impact of Foliar Fungicide Timing on Standability and Yield in Corn ...................................................................... 17 Evaluating Corn Response to Late-Season N Application in Conventional Tillage and No-tillage Systems .................... 21 Irrigation Response of Different Corn Hybrid Maturities in Kentucky ................................................................ 24 Determining Yield and Profitability of Different Corn Irrigation Strategies ...................................................... 27

Management of Caterpillars in Conventional Corn

in Western and Eastern Kentucky .................................... 31 Testing Heirloom Corn in Central Kentucky ....................... 36

2019 Fragipan Remediation Report .................................. 38

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36

Testing Heirloom Corn in Central Kentucky

ChadLee,JuliaSantoroandJamesDollarhide

Several heirloom or open-pollinated lines of corn

were compared with a modern yellow and a mod- ern white hybrid near Lexington, KY. The soil was a Bluegrass-Maury slit loam, no-till, planted to soy- beans the year before. The study was irrigated as needed. Herbicides were applied early postemer- gence before corn was 11 inches tall. Hand-hoeing was used after corn emergence. All corn was planted May 14, 2019 into rows spaced

30 inches apart. The heirloom corn types were seeded at 15,000 seeds per acre and the modern

hybrids were seeded at 30,000 seeds per acre. Each plot of corn was four rows wide. Each heirloom corn or modern hybrid was planted into four separate plots that were randomized in complete blocks. The middle two rows of each heirloom or hybrid were harvested on October 2, 2019. The average yield for all four plots of each heirloom and hybrid was calcu- lated and those values were compared with statis- tics to identify differences. 37

Figure2: Yields of heirloom open-pollinated corn and two modern hybrids, P1618WAM (white) and P1464AML

(yellow).

Heirloom corn lines ranged from 44.4 bushels per

acre for Bloody Butcher to 95.2 bushels per acre for

Reid's Yellow Dent. Reid's Leaming Yellow Dent

ranked second among the heirlooms with 81 bushels per acre and Blue Clarage Dent yielded 71.4 bushels per acre. Hickory King yielded 64.6 bushels per acre.

These yields were far below the modern hybrids,

which averaged 177.5 bushels per acre. The average yield of the three heirloom dent corns was 84.3 bushels per acre. The heirlooms yielded less than half of the modern hybrids. Farmers and distillers should consider these yield differences when determining value for the heirloom grain.

ACKNOWLEDGEMENTS

Thanks to Dan Quinn and Grifϐin Mobley for assisting with this research.

GRAIN CROPS

GRAIN AND FORAGE CENTER OF EXCELLENCE

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