The influence of harvest date and crop treatment on the production of two different sugarbeet variety types
2003
Jozefyova, L. | Pulkrabek, J. | Urban, J. (Ceska Zemedelska Univ., Prague (Czech Republic))
The effect of harvest date on the production of two different sugarbeet variety types (the Z-type variety Elan and the NE-type variety Epos) grown in three patterns (1. check pattern, 2. fertilization with 50 kg N/ha, 3. fertilization with 50 kg N/ha + fungicide treatment) was evaluated in a four-year experiment. The sugarbeet was harvested at two different dates as follows: 1) at the beginning of the beet processing season, 2) four weeks later. Statistically significant differences between the varieties became apparent mainly at the later harvest date as the root yields of Epos were higher by 4.35 t/ha than those of Elan while its sugar concentration was lower by 0.3 %. The postponement of the harvest date led to an increase of the yield. On the contrary, the sugar concentration as well as the concentration of molassigenic substances depended rather on the year than on harvest date. The effect of fertilization and fungicide treatment became apparent at the later harvest date as shown by the root yield increase of about 10 %. Spraying with fungicide in comparison with the use of equal amount of fertilizer but without fungicide increased the sugar yields by almost 8 %.
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