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Harvest date does not influence variety ranking in Belgian forage maize variety trials

Published online by Cambridge University Press:  29 October 2015

J. SWANCKAERT ,
J. PANNECOUCQUE ,
J. VAN WAES ,
B. DE CAUWER ,
J. LATRE ,
G. HAESAERT  and
D. REHEUL
J. SWANCKAERT*
Affiliation:
Institute for Agricultural and Fisheries Research (ILVO), Burg. Van Gansberghelaan 109, 9820 Merelbeke, Belgium Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, Proefhoevestraat 22, 9090 Melle, Belgium
J. PANNECOUCQUE
Affiliation:
Institute for Agricultural and Fisheries Research (ILVO), Burg. Van Gansberghelaan 109, 9820 Merelbeke, Belgium
J. VAN WAES
Affiliation:
Institute for Agricultural and Fisheries Research (ILVO), Burg. Van Gansberghelaan 109, 9820 Merelbeke, Belgium
B. DE CAUWER
Affiliation:
Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, Proefhoevestraat 22, 9090 Melle, Belgium
J. LATRE
Affiliation:
Department of Bio- and Food Science, Faculty of Science and Technology, University College Ghent, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
G. HAESAERT
Affiliation:
Department of Applied Biosciences, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Ghent, Belgium
D. REHEUL
Affiliation:
Department of Plant Production, Faculty of Bioscience Engineering, Ghent University, Proefhoevestraat 22, 9090 Melle, Belgium
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

Silage maize variety testing systems usually evaluate new varieties within properly defined maturity groups; within a maturity group, all varieties are harvested on a single harvest date. In a small country like Belgium where growing conditions are similar across the maize growing areas, all tested silage maize varieties, comprising different maturity groups, are harvested on a single date. Under this testing system, only few varieties are harvested at the physiological stage where they theoretically show their optimal performance. In the current research, eight silage maize varieties were monitored from 25 to 40% whole-crop dry matter (DM) content at three locations in Belgium during the period 2007–2009. The optimal harvest date was calculated as the date where whole-crop DM yield, ear DM yield and organic matter digestibility were maximal. The variety rank at the optimal harvest date was compared with the variety rank at any studied single harvest date. Harvest dates where the variety rank was not statistically different to the rank at the optimal harvest date were pooled in a ‘harvest window’. Based on the current data, the harvest window comprised a flexible harvest period of about 14 days. It was therefore concluded that applying a single harvest date is scientifically justified for the ranking of silage maize varieties in Belgium, when the whole-crop DM content is between 28·1 and 40·6% with a maximum difference of 7·2% between all compared varieties.

Type
Crops and Soils Research Papers
Information
The Journal of Agricultural Science , Volume 154 , Issue 6 , August 2016 , pp. 1040 - 1050
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Copyright
Copyright © Cambridge University Press 2015 

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