The vegetation period of 2007 was droughty in Hungary. There was only 2.1 mm precipitation in the spring of 2007 from 25 th March to 3 rd May, so this circumstance made it possible to study the effects of drought stress in our experiments. Our study was carried out at Keszthely in early summer. The effect of different cultivation methods (no-till drill, disk tillage, conventional tillage) was studied in long-term field experiment on the weediness of maize and competition between maize and weeds. Competition of weeds with maize for water and essential sources can be considered as biological stress. Plant samples were taken on the 25 th of June, 9 weeks after sowing of maize. Within all plots there was a 4m 2 non-herbicide treated sampling site (weedy) to study the competition. For comparison, maize plants from neighbouring herbicide-treated (weed free) sites were harvested and analyzed. The aerial parts of plants were collected, and the fresh and dry matter weight was measured. We analyzed in detail, the occurrence of weed species, and the biomass production of weeds in comparison with maize. Data obtained from weedy and weed-free control areas were then compared. The effect of different cultivation methods and N doses influenced markedly the weed cover, the number of perennial and annual weeds and the number of occurring weed species.
ASJC Scopus subject areas
- Agronomy and Crop Science