| As a perennial weed of the turf in South China, green Kyllinga (Kyllinga brevifolia Rottb.) is widely spread in the lawn. It has been identified as a vicious weed.By the systemic investigation on the distributing characteristics of green Kyllinga in Shenzhen, combined with the study of biological, photosynthetic characteristics and allelopathy, a theoretical basis of the best control time and method on green Kyllinga is provided. At the same time, the reason that green Kyllinga was in a dominant position in the turf is found. On the basis of these researches, the preliminary study of non-chemical control methods was used for green Kyllinga. And the result shows:1. Green Kyllinga was bourgeoned largely in the high temperature and humidity during April and September. When the temperature reached 25°C and the soil moisture reached 20%, the germination rate of green Kyllinga would exceed 80%.The stolon of green Kyllinga in the soil was most difficult to be controlled. It would be spread when the condition was allowed. The best time before bourgeoning for controlling the green Kyllinga in Shenzhen was early March. The chemical control methods were used for rudimental stolon in the soil from mid-November to the next late-February. In addition, a good control result would be got by the refinement of cultivation and management.2. By the stronger nutrition competition with Zoysia, there was a growth advantage for green Kyllinga in turf. Whether the ability to adapt to adversity (Transpiration), or accumulated material capacity (Pn) and the use of solar energy capacity (Photosynthetically active radiation), green Kyllinga is better than Zoysia. Photosynthesis associated with the results of physical and chemical indicators also shows that, short of the water centipede light absorption capacity (Chlorophyll content), as well as nitrogen assimilation capacity (Nitrate reductase activity) than Zoysia. These two were the key factors of the photosynthesis and affected the ability to organic synthesis and accumulation the plant.3. By the test of the biological and physiological experiments and GC-MS for green Kyllinga, the results showed that there were some influences to the germination and antioxidant systems of the lawn plants. Also there were only 5 kinds of allelochemicals in the extraction, but the content was enough to affect the other plants in turf.4. The experiments in the laboratory and greenhouse showed that the germination rate and root growth of green Kyllinga could be controlled by soybean meal and the hydrolysis of soybean meal, which affected the seedling growth a little. The mixed fertilization was more effective than surface fertilization. |
