Sockerbetans uppkomst och tillväxt i olika såbäddar

The quality of the seedbed is a determining factor for the establishment of the sugar beet. A favorable distribution of the aggregate size and the content of plant available water are contributing factors to a fast emergence. A high rate of emergence results in seedlings with a higher energy content, which increase the early growth. An early leaf development contributes to increase the interception of the solar energy in the sugar beet canopy. A high amount of intercepted energy gives the sugar beet a higher potential in yield. This work is about a pair study of sugar beet producing farms with similar soil type and climate conditions, but with divergent yields in sugar. The examinations concentrated on describing the quality of the seedbed, as for example the aggregate size distribution, the amount of plant available water, the depth of the seedbed and the sowing depth. The establishment and development of the sugar beet were examined after emergence, the groundcover was measured with digital technique. The purpose of this work was to find limiting factors in the emergence and the early growth in the 14 examined sugar beet fields . The management of the fields was studied in the purpose to find differences that could hence to the difference in yield. The number of crossings the farmer chose to do before sowing varied and there were no connection between the intensity in the preparation of the seedbed and the plant establishment. The compact den sit y and specific weight in the seedbed were estimated. The degree of compaction in this layer has a influence on the sugar beet seedlings. The examination showed a connection between a low density in the seedbed bottom and a high plant establishment. The farms with a higher yield produced a more even seedbed bottom and had a higher precision in the seed placing. The groundcover was measured with a digital camera and the pictures were analyzed. The sugar beet leaf development in June and July was estimated for each of the 14 fields. These trials showed a connection between an early leaf growth and a high yield in sugar. There were also a relation between an early date of sowing and a high and early leaf growth. These two observations indicate that there is a correlation between an early sowing and a high sugar yield.