Long-term tillage and rotation effects on the weed seedbank
2001
Lauringson, E. | Kuill, T. | Talgre, L. | Vipper, H. | Hirsnik, L. (Estonian Agricultural Univ., Tartu (Estonia). Dept. of Field Crop Husbandry)
The influence of different agrotechnological methods and three crop rotations on weed seedbank was measured. Soil tillage technology influenced the location of weed seedbank in the soil. According to the average data, most of the seedbank lay in the upper 5 cm soil layer. Constant use of chemical weed control lowered the number of weed seeds throughout the ploughed layer, minimizing the danger of weeds spreading in crops with low competitive ability. A prolonged use of herbicides contributed to the spread of weed species resistant to chemical weed control and the growth of their seedbank in the soil. In this experiment, the replacement of ploughing with stubble cultivator loosening did not result in a significant increase in weediness and soil weed seedbank when chemical weed control was applied. Under no herbicides, soil weed seedbank increased significantly when annual weeds with a large seed yield become prevalent. An increase in ploughing depth led to a decrease in soil weed seedbank, whereas different loosening depths had no obvious effect on soil weed seedbank. Thus, the concentration of weed seeds in the ploughed layer depends on crop wediness, the biological and morphological features of crops and weed species, soil fertility and, to a significant extent, the quality of the agrotechnological methods applied
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