عنوان مقاله [English]
Background: Weed seed bank in the soil is an important source of weeds that enables them to be present in the fields. The seed bank density in a crop may reach a million seeds per square meter. The weed seed bank differs depending on the location and time, depending on the crop operation, crop rotation, and herbicide selection. Due to the economic benefits and improved crop ability, the use of plant remains has become an attractive and acceptable way in agriculture. Allelopathic plant remnants can have a beneficial effect on weed control. The allelopathy of these plants plays an important role in controlling the seed bank of weed soils. Therefore, this study conducted to investigate the effect of mixing different amounts of residues of three medicinal herbs on the potential of weed seed bank in Malekan region.
Materials and Methods: This study carried out at Malakan Azad University labs in 1397. Treatments included mixing different amounts of residues (0, 50, 100 and 150 g / m2) and three medicinal plants were cumin, seaweed and marjoram. Samples had taken from a depth of 0 to 20 cm in an ocher system (7 cm radius) to measure the seed bank of soil. Weeds were isolated and their species were identified. Laboratory studies conducted to determine the germination strength of these seeds. This part of the experiment carried out with three replications in a completely randomized design.
Results: In total, 53915 weed seeds detected per square meter. The highest seeds in the soil belonging to weed carnivorous and lambspeed were 33254 and 12457 seed per square meter of soil, respectively. The seeds of these two weeds included 95.4% of the seed bank of soil weeds. In this study, the remnants of seaweed and marigold caused a significant decrease in germination characteristics and growth of seedlings of these weeds. Remains of cumin have little effect on the traits studied. Seed germination and seedlings growth These weeds decreased by 44.7% and 84.9%, respectively.
Conclusion: By increasing the amount of application of the remains, a greater reduction in germination and weed growth achieved. The remnants of the two herbs had a similar or similar effect on germination and seedling growth. Overall, the results of this study showed that the remnants of medicinal plants could reduce the diversity and abundance of seed bank of soil weeds. remnants of medicinal plants could reduce the diversity and abundance of seed bank of soil weeds.ee