TY - JOUR AU - O. Vitanov AU - Yu. Zelendin AU - N. Chefonova AU - O. Melnyk AU - D. Ivanin AU - L. Uriupina PY - 2021/01/14 Y2 - 2024/03/29 TI - ALLELOPATHIC PROPERTIES OF ASSOCIATED ONION PLANTS JF - Vegetable and Melon Growing JA - VMG VL - 0 IS - 68 SE - Articles DO - 10.32717/0131-0062-2020-68-52-62 UR - https://vegetables-journal.com/index.php/journal/article/view/293 AB - Purpose. Determine the allelopathic properties of concomitant onion crops under an alternative system of cultivation. Methods. Laboratory-field, statistic. Results. Laboratory research (in Petri dishes) did not reveal a negative effect of related crops seeds (winter and spring crops) on seedling length and germination energy of onion. Mixture of winter triticale seeds and spring vetch contributed to a 14% increase in seedling length. However, water extracts from aboveground phytomass and roots of related crops generally significantly suppress the germination of onion seeds on the 3rd day from the beginning of germination. In the future (on the 7th and 10th day) the degree of depression decreases. Aqueous extracts from the roots of concomitant crops are less toxic to onion seeds than extracts from aboveground phytomass, but in the phase of bulb formation extracts from the roots of winter and winter-spring components significantly suppressed the germination of the onion seeds even on the 10th day, which amounted to 59 - 63%. The most toxic for onion sprouts was the extract from the roots and above-ground phytomass in phase leaf lodging of the onion itself (Control 2) – seed germination in the 3rd day was 24 - 36% (at Control 1 - distilled water - 51 - 55%). According to the results of field research it was found that for growing on intensive and organic technologies (control 1 and 2) without related crops was obtained the harvest in onions respectively 44.6 and 43.4. On average, by factor A, the yield of onions for cultivation with associated crops is inferior control K1 and K2). On average, by factor B (distance between of onion rows and related crops) there was a gradual increase in yield from 41.1 t/he (70 cm from related crops) to 42.8 t/he (105 cm).The best result in the experiment on the additive effect of both factors was obtained in a row distant 105 cm from the mixture of winter triticale with spring vetch - 42.9 t / he. Conclusions. In alternative (organic) vegetable growing for introduction of multicultural agrogroups it is offered to apply a strip way cultures of cultivation that allows to mechanize all technological operations in the conditions of multiculture. According to the developed method as an accompanying crop for onions, involved not vegetable plants species. Determination of allelopathic properties of related crops, their effect on onion plants should be carried out according to the method of special biological tests. ER -