Die Grundlagen des natürlichen Erdbeeraromas

Due to its abundance of taste and odour compounds the strawberry becomes more and more popular. But what makes the flavour of this fruit so extraordinary? Scientists from the Technische Universität München (TUM) provide an answer. They succeeded in the elucidation of the formation pathway of a key aroma chemical of strawberry fruit on the molecular level.     

Die Eignung unterschiedlicher Komposte im Vergleich zu Stallmist für die organische Düngung in der Baumschule

Der Einfluss von Bioabfallkompost, Grüngutkompost und Stallmist (Pferd) auf verschiedene Bodeneigenschaften und das Wachstum von Ligustrum vulgare L. wurde für 3 Jahre auf einem Sandboden mit 3% organischer Substanz untersucht. Der Versuch hatte folgende Faktoren: 200, 400 und 800 dt/ha Stallmist und gleichen Frachten an C entsprechende Mengen Bioabfallkompost und Grüngutkompost sowie keine organische Düngung. Außerdem wurde der Faktor Ausbringungshäufigkeit untersucht: einmal innerhalb von 3 Jahren und 2-mal innerhalb von 3 Jahren, d. h. erneute Ausbringung vor der 2. Aufschulung nach 2 Jahren Kulturzeit.Es gab keine signifikanten Unterschiede im Humusgehalt zwischen den Faktoren und der Kontrolle.     

Die Eignung unterschiedlicher Komposte im Vergleich zu Stallmist für die organische Düngung in der Baumschule

For three years the influence of biowastecompost, greencompost and farmyard manure (horse) on several soil properties and on the growth of Ligustrum vulgare L. were investigated on a sandy soil with about 3% organic matter. The following treatments were carried out: 200, 400 and 800 dt/ha farmyard manure and corresponding amounts of biowastecompost and greencompost to result in equal amounts of applied organic carbon as well as no addition of organic fertilizer. Frequency of application was also investigated: only once within three years and twice within three years, i.e. the organic fertilizers were given again before the second culture of Ligustrum vulgare L. after two years.There were no significant differences in soil organic matter between the treatments and the untreated plots.Already for the 200 dt/ha-treatments the amount of N given with the organic fertilizer was much higher than the uptake of most of the tree nursery plants. The mineralization of N from the biowastecompost and the farmyard manure increased the mineral N-Content of the soil compared to the untreated plots. The mineralization was biggest for the 400 dt/ha treatment. The mineralized N was not taken up by the plants. For the greencompost the mineralization was smaller compared to the untreated plots. Immobilization took place, which was for the 200 and 400 dt/ha treatments in part compensated by the mineralization of N from the organic matter of the soil.Plant growth was slightly increased for the greencompost. This was attributed to lower water tensions during times of high water tensions. The greencompost used in this experiment can be recommended as a good substitute for farmyard manure.