The effect of planting dates on yield performance and blight incidence to two potato (Solanum tuberosum L.) cultivars at Adet
1999
Tesfaye Abebe(Adet Research Center, Adet (Ethiopia)) | Anteneh Abewa(Adet Research Center, Adet (Ethiopia))
The use of environmentally safe optimum agronomic packages is one of the easy through which sustainable crop production is attained. To this effect two potato cultivars were tested on different planting dates for two consecutive years (1988-1989) at Adet to see their yield and reaction to disease. The trial was laid out in a split-plot design with five different planting dates at fifteen days interval and two potato cutivars (AL-624 and local cultivar), the former being assigned to the main plot while the latter to the sub-plot. The result indicated that there is significant difference in yield and disease incidence among the cultivars over the tested planting dates. They yield of the last planting dates was comparatively low with high disease score. On average a yield reduction of 31 kg/day was recorded for Al-624 planted after June first while 15 kg/day for local cultivar planted after May fifteen. It was also observed that yielding level apparently varied among potato cultivars. The cultivar AL-624 gave the highest yield almost in all planting dates considered than the local cultivar. Hence, although fixed date recommended in planting time is not practical, planting susceptible cultivars early May to mid May while moderately resistant cultivars early May to early June depending on the onset of rain is the appropriate time for higher yield harvest with low disease incidence while delaying will result in high disease incidence at the earlier crop growth stage and lower yield as a consequence.
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