Versuchsergebnisse zur Abtoetung ueberwinternder Zwischenfruechte sowie Altverunkrautung mit Roundup in Zusammenhang mit einer Direktsaat zu Rueben und Mais.
1990
Klaassen H. | Ohme J.
In the past years direct or mulch seeding of sugar beets and corn in particular has been effected especially in areas with a high soil erosion potential. A well done intercrop is the requirement for the optimal performance of this system and the suppression of weeds which is more and more achieved by growing frost susceptible intercrops like Phacelia. At lower temperatures these crops are freezing to death so that in spring seeding can be done on a relatively weed free soil without any or with only slight cultivation during frost. If winter intercrops like rapessed, ryegrass and winter rye are grown - which have the positive effect of diminishing nitrate leaching - a herbicide treatment in spring is necessary in order to kill these intercrops. In directly seeded sugar beet trials applications were normally made in early April, 1-3 days before seeding. Corn trials were laid down at the end of April, 1 day to 2 weeks before seeding without any cultivation. The intercrops ryegrass and winter rye are reliably controlled with 2 l/ha Roundup +10 kg SSA in 200 l/ha spray volume. Rapeseed is well controlled if the leaf surface is big enough for herbicides absorption. Alopecurus myosuroides, Apera spica-venti, Poa annua and volunteer cereals are also well controlled. Galium aparine and Natricaria chamomilla are not always safely controlled with 2 l/ha Roundup + SSA, while control of Lamium and Veronica species and Stellaria media is good. Roundup offers the possibility of specific control of winter intercrops and old weed in mulch and particularly in direct seeding systems.
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