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Harvest Date and Hybrid Influence on Corn Forage Yield, Quality, and Preservation

Heather M. Darby*,a and Joseph G. Lauerb

a Dep. of Hortic., Oregon State Univ., 4017 ALS, Corvallis, OR 97331
b Dep. of Agron., Univ. of Wisconsin, 1575 Linden Dr., Moore Hall, Madison, WI 53706



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Fig. 1. Relationship between whole-plant (a) dry matter yield, (b) crude protein (CP) concentration, (c) neutral detergent fiber (NDF) concentration, (d) acid detergent fiber (ADF) concentration, (e) in vitro true digestibility (IVTD) concentration, and (f) cell wall digestibility (CWD) concentration and (g) milk per megagram and (h) milk per hectare on growing degree units (GDUs). Data are reported for unfermented forage ({blacksquare}—) and silage ({square} - - -). Each data point is the mean across four hybrids, four replicates, and 2 yr. Equations and coefficients of determination (R2) for Fig. 1 are reported in Table 3. R1 refers to the growth stage of corn when silks were emerged on at least 50% of the plants.

 


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Fig. 2. Relationship between stover (a) dry matter yield, (b) crude protein (CP) concentration, (c) neutral detergent fiber (NDF) concentration, (d) acid detergent fiber (ADF) concentration, (e) in vitro true digestibility (IVTD) concentration, and (f) ear/stover ratio and growing degree units (GDUs). Each data point is the mean across four hybrids, four replicates, and 2 yr. Equations and coefficients of determination (R2) for Fig. 2 are reported in Table 3. R1 refers to the growth stage of the corn when silks were emerged on at least 50% of the plants.

 





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The SCI Journals Crop Science 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 © 2002 by the American Society of Agronomy.