@conference{
author = "Savc, A. and Müller-Schärer, H. and Bozic, D. and Pavlovic, D. and Saulic, M. and Andjelkovic, A.",
year = "2017",
abstract = "Common ragweed (Ambrosia artemisiifolia L.) is an economically harmful species, which is a strong competitor for natural resources and space. Crop yields can be significantly reduced or completely destroyed when ragweed reaches high densities. In addition to A. artemisiifolia, giant ragweed (Ambrosia trifida L.) is also locally present and naturalized in Serbia, especially in the area of central Backa. Its size well exceeds that of A. artemisiifolia, reaching a height of 4 m. Considering that A. trifida is currently expanding, it is expected that it will be more competitive than common ragweed once they occupy the same area, not only in crops, but also in natural ecosystems. Consequently, the aim of this study was to determine the biomass of A. trifida under competitive interaction with A. artemisiifolia. The experiment was conducted using a replacement design model, where the competitive interaction between A. artemisiifolia (AA) and A. trifida (AT) was assessed. The experiment involves six treatments with ratios of AA:AT plants as a-10:0; b-8:2; c-4:6; d-6:4; e-2:8 and f-0:10) and 10 plants per m2 arranged in a completely randomized block design, with four blocks. The vegetative parameters of AT (height, width, number of leaves, dry weight) were measured in three assessments during the 2016 season and subsequently analyzed. The average values of height in the first assessment were in the range of 37-51 cm, in the second from 71-100 cm and in the third from 87-155 cm. Statistically significant differences (P < 0.01) were found between f and e, f and e, and f and d, and between f and e in these three assessments respectively. Plants from the F treatment reached their maximum heights in the first and second assessment, while in the third assessment the maximum height was recorded in the treatment b. Average width of the plants ranged from 18.5-20.5 cm (1st assessment),16.094-20.15 cm (2nd assessment) and 17.25-34 cm (3rd assessment). Asin the case of their height, maximum values of width were documentedfor the f treatment in the first and second assessment, while in the third assessment the maximum width was recorded for the b treatment. Statistically significant differences (P<0.001) were registered in all three assessments, when comparing the treatment f with the e and d treatment. The average number of leaves in the first assessment was from 8.03-9.625, and from 11.875-13.125 in the second, where AT formed the highest number of leaves in treatment f. Statistically significant differences (P<0.001) were recorded only in the first assessment between treatments f and c, and f and e. In the third assessment, the average number of leaves was the highest in the treatment b. The average dry weight values ranged from 5.8-11.49 g in the first assessment, 7.4-11.63 g in the second and 8.96-14.15 g in the third assessment. The relationship between treatments differed in comparison with the other parameters, which is probably the result of a different ratio of the stem and leaf weight of the plants in different treatments. The obtained results have shown the competitive capacity of A. trifida and its invasiveness in coexistence with A. artemisiifolia.",
publisher = "EWRS",
journal = "The 5th Inernational Symposium weeds & invasive plants, Chios–Greece, Book of Аbstracts",
title = "Vegetative performance of Ambrosia trifida L. in competition with Ambrosia artemisiifolia L.",
pages = "76-75",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6451"
}
