DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 10-12/1976 str. 33 <-- 33 --> PDF |
važno, jer često zbog nepovoljnih vremenskih prilika sjetvu treba brzo obaviti; — međutim, ukoliko je ovaj razmak bio kraći efikasnost djelovanja na korove se smanjivala; — ispitivanja u cilju utvrđivanja optimalnog vremenskog razmaka između tretmana i sjetve trebalo bi nastaviti, ali i već dobiveni rezultati su za rasadnioku praksu od interesa, obzirom na njenu potrebu za nekim efikasnim, jeftinim i po sredinu bezopasnim kemijskim sredstvom za suzbijanje korova u sjemeništu. LITERATURA 1. Berner, R. C, Abernathy, J. R., Smith, D. T. (1975): Influencing weed control by delaying incorporation of 3 preplant herbicides. Proceedings 28th Annual Meeting Southern Weed Science Society, Texas. 2. J o j i ć, D. (1975): Novi herbicid Cobex — neke njegove osobine i mogućnosti primjene. Biljna zaštita 4, Zagreb. 3. Naish, R. W., Uprichard, E. A. (1974): Dinitraminea new incorporated herbicide for peas, beans, and field brassicas. Proceedings of the 27th New Zealand Weed and Pest Control Conference, Nelson. 4. Zekić , N., Ćukac , N. (1973): Rezultati primjene nekih novijih preparata kod suzbijanja korova u šumskim sjemeništima. Jugoslovenski simpozij o borbi protiv korova, Sarajevo. SUMMARY New experiences in controlling weeds in the seed-beds One o the essential conditions for the production of a qualitative planting stock — for which there is an ever greater demand — is a timely and efficient protection from weeds in the seed-beds. Because of the unsuitable mechanical and manual protection — from which also young seedlings suffer, and owing to insufficient labour — we are trying to solve this problem by appliyng chemicals for destroying the weeds. The majority of chemicals so far applied have not satisfied, either of account of their poor or short efficiency, their toxicity for young seedlings, or their complicated use. An examination of the newly produced herbicide Cobex (24 °/o-Dimtramin) in the Scots Pine (Pinus silvestris L.) seed-beds have given good results. Total invasion by weeds was reduced by 94.6%. The prevailing weed Setaria glauca (L.) P. B. was reduced by 59.3 %, Agropyrum repens (couch-quitch) by 59.3%, and many species by even as much as 100 Vo. The dry matter of the weeds was reduced by more than 20 times. The Cobex herbicide was highly selective for young seedlings of Scots Pine (Pinus silvestris L.), while an experiment carried out in 1976 demonstrated that also young seedlings of European Black Pine (Pinus nigra Arn.), Spruce (Picea abies (L.) Karst) and European Larch (Larix decidua Mill.) did not suffer from this herbicide. It was established that the time-span between treatment and sowing may be very short without any challenge to young seedlings, which is very significant for young seedlings, for owing to unfavourable weather conditions sowing ought to be perfomed within a short time. However, through shortening the aforementioned time-span also the weed-killing efficiency of the herbicide has diminished. Therefore investigations should be continued with the aim to establish the optimal time-span between treatment and sowing. Primljeno u lipnju 1976. Nada Zekić, dipl. ing. šum., Institut za šumarstvo Sarajevo |