Sjemenarstvo, Vol. 12 No. 2-3, 1995.
Izlaganje sa skupa
PRODUCTION OF ALFALFA SEED IS LIMITED BY PRESENCE OF CUSCUTA SPP.
Svetislav Popović
; Poljoprivredni institut Osijek
Mirko Stjepanović
; Poljoprivredni institut Osijek
Sažetak
Seed quality is an important factor in relation to the arable land production, in particular for alfalfa and other leguminoses of small-sized kernels. Alfalfa fields are considered polyphytic areas on which in addition to alfalfa number of other plant species normally develop under favourable conditions. In the alfalfa fields of the Eastern Slavonia which have been treated with herbicide preparations, 124 plant species were found, out of which there were 9 Fabaceae, 24 grass species, 90 herbaceous plant (Knežević and Volenik, 1982). The presence of other species in alfalfa reduces its quality, the yield of voluminuous fodder and seed, as well as the time of its utilization, while the alfalfa seed infected with Cuscuta spp. has no market value. With the expansion of the production of alfalfa seed, the presence of Cuscuta spp. becomes even more evident. In the region of Slavonija and Baranja, its presence was recorded on approximately 40% plots under alfalfa, whereas in Istria, on the reddish soils, it was found on about 80% plots. In the production of alfalfa seed, Cuscuta spp. is a quarantine weed species and therefore as to be controlled both mechanically and using herbicide preparations. This investigation included the application of four herbicide preparations (Kerb 50, Cidokor, Pivot 100 E and Aretit flussig) before the vegetation, after cutting the first growth in two different quantities at the location of Osijek and Poreč (1988 and 1989). The results of the tests in Osijek have shown that the areas treated with the Kerb 50 preparation (in mean over two years) had the lowest portion of Cuscuta spp. seed (2,35%) whereas on the non-treated area its portion was found to be 9,29%. The applications of other herbicide preparations have led to poorer results. The tests carried out in the region of Poreč, the region characterized by a different climatic environment, have shown considerably poorer efficiency of the preparations as compared to the region of Osijek. The best result was achieved with the application of Kerb 50. The portion of the Cuscuta spp. seed was, however, 53,63%. Its portion recorded on the non-treated area, averaged over two years, was 78,61%. Other herbicide preparations attained poorer results in the region of Poreč, as well.
Ključne riječi
Hrčak ID:
167784
URI
Datum izdavanja:
29.4.1995.
Posjeta: 838 *