Comparison of some methods for estimating vegetation periods in maize
2007
Marton, C. L. | Kálmán, L. | Árendás, T. | Bónis, P. | Szieberth, D.
A new method has been elaborated to estimate the length of the vegetation period of new maize hybrids. According to this method, the length of the vegetation period is expressed by the FAO number, calculated from the following traits: <ul> <li> 1. 50% silking </li> <li> 2. Grain moisture when the average grain moisture of maturity group standards is 25% </li> <li> 3. Grain moisture when the average grain moisture of maturity group standards is 20% </li> <li> 4. Grain moisture at harvest. </li> </ul> The standards of the neighbouring maturity groups are also included in each experiment.The results obtained with this method were compared to the heat unit (GDD) method and to other methods of calculating FAO numbers. The new method has several advantages over previous techniques based on moisture content alone: the fluctuation of the estimated FAO number over locations and years decreased, as did the significant differences between the calculated FAO numbers; the reliability and precision of the new FAO number is less dependent on the date of harvest (moisture content); and the FAO numbers calculated with the new method are in the closest correlation with the heat unit estimates.
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