Structure of weed flora in wheat depending on crop rotation and fertilizing. [M.Sc. thesis] | Структура коровске флоре пшенице у зависности од плодореда и ђубрења. Магистарска теза

For the purpose of studyng diversified crop rotation and fertilizing the structure of weed flora in wheat, two-year long research has been carried out on the winter wheat variety Novosadska Rana 2 on the long-standing experimantal plots Crop Rotation of the Institute of Field and Vegetable Crops in Novi Sad (Serbia), on the location known as Rimski Sancevi. In the wheat crops, Novosadska Rana 2 variety, on the experimental plot - Rimski Sancevi, during two-year field research, 36 weeds were identified belonging 21 families. Out of the total number of 36 identified weed species, 11 are weed plants in a limited sense - segetal, 23 species are weed-ruderals, 1 is ruderal and 1 is a weed found on meadows and pastures. The analysis of total biological spectrum on all the variants of the experimental plot indicates the terrophytes dominance weed 78; (28 taxons), among them the most representative are T4 terrophytes. Live form of geophytes make only 17; (6 taxons). Within the spectra of areal types of weed flora of wheat, on all variants of experimental plot, the widest spread are the varieties of wide areal, since anthropogenous are in question. On the most of variants of the expetimental plot mesophytes are dominant indicating moderate humidity of the soil (F3). The analysis of the ecological index for chemical reaction of the soil indicates the dominance of indicator of neutral to low acid environment. The greatest floristic diversity (24 taxons) as well as the greates weediness is noted on the unfertilized two-field system. On the basis of the obtained results and the facts found in the references, it can be concluded that for all unified ecological conditions, there are still differences in the floristic structure and the level of weediness, as well as in the dominant weed sorts in different variants of the experimental plots, that certainly comes from the application of different agrotechnical engineering operations.