By using diferent synthetic pyrethroids, respectively fenpropathrin and deltamethrin for the conventional spray technique (2000 l/ha) and permethrin and cypermethrin for the low-volume spray technique (50 l/ha), both techniques could be compared the same day on the same chrysanthemum vegetation. As the pyrethroids are separated well both techniques...
Aandacht voor de rol van mycorrhiza in verband met het afsterven van bossen en het gebruik van mycorrhiza als middel tegen beschadiging van bomen door zure depositie en luchtverontreiniging
There were two hypotheses on the formation of loessoid soils in south Limburg. F. H. van Rummelen and W. J. Jongmans explained the origin by weathering of underlying rocks and reworking of the weathered material by water; J. H. Druif concluded on qualitative mineral data that the soil material was wind-borne from the north.Detailed descriptions of ...
