In recent years, the Chinese eel farming industry has experienced significant growth, with the adoption of the indica rice rotation model. This method not only allows rice to be cultivated without the need for fertilizers but also improves the sediment quality of eel ponds and reduces the occurrence of diseases. Zhejiang Qingxi Sengye Co., Ltd. initiated experiments with japonica rice rotation as early as 1999. Through practical implementation, they developed an ecological rotation system known as "cultivating glutinous rice for 2 to 3 years and planting one season of rice." This model has since been widely adopted in production.
First, the construction of the rice pond system is crucial. Each pond area ranges from more than 3 acres to up to 80 acres. The pond bottom is kept as the original rice field, avoiding deep digging, just a flat surface. Cement bricks are used to build walls around the pond, with a height of 1.2 meters, maintaining a water level of 1 meter. The inlet and outlet channels are separated, with the inflow channel built on top of the bricks and the surrounding channels kept smooth. The outlet uses a PVC elbow for controlled drainage, ensuring convenient irrigation and drainage within the pond.
Second, the japonica rice rotation pattern typically involves cultivating glutinous rice for 2 to 3 years followed by one season of rice planting. Juveniles are stocked in mid-May, with each juvenile weighing approximately 180 grams, and stocking density ranging between 500 to 1000 per mu. The soft-shell turtles are fed live fish, and harvesting occurs before the end of July in the following year. Late rice is planted at the end of July or early August. During the rearing process, ponds are cleaned using natural substances like quicklime, and no chemical drugs such as antibiotics or chlorine-based agents are used. Instead, traditional Chinese herbs like Banlangen are often employed for disease prevention.
Regarding rice cultivation techniques, due to the fertile soil in Dianchi Lake, high-quality dwarf-stemmed varieties like Shanyou 1 and 98-110 are selected. Cultivation follows a "prevention-focused" approach, using the "two controls and one defense" technology. This includes controlling fertilizer use entirely, avoiding any application during the growing period; controlling water levels—early field control for seedlings, followed by watering when tillers reach 80% of the panicle stage to promote deep root development; and late wet irrigation to prevent lodging. Only minimal pesticide use is required, and the resulting rice meets pollution-free standards.
Third, several key experiences have emerged from this practice. First, the japonica rice rotation model represents an effective ecological farming approach. By rotating crops and animals, it significantly reduces pests and diseases. In these areas, rice can be grown without tilling or fertilizing, and only a small amount of pesticides is needed, greatly reducing labor requirements. Second, combining the japonica rice rotation with polyculture of fish and barnyardgrass creates a comprehensive ecological breeding system. Depending on the fishing season, different crops such as rice, corn, and barley are planted. Fish can also be raised in the same pond, and perennial barley is used to feed herbivorous fish, forming a closed-loop ecological system. Third, the indica rice rotation model offers substantial ecological, economic, and social benefits. Raising earthworms increases soil fertility, while rice cultivation enhances sediment quality in Dianchi Lake. After rotation, pest and disease problems are reduced, making the ecological benefits very evident. Rice farming boosts economic returns, and the absence of fertilizers and low pesticide use lowers production costs, increasing yields by about 13%. The economic value of rice grown in Dianchi Lake is higher than that of conventional paddy fields. Implementing this model helps stabilize grain areas, enhance land fertility, and increase yield per unit, offering great potential for broader adoption.
Pelvic Plate
Due to the irregular characteristics of the pelvic structure, the choice of internal fixation is diverse.
For patients separated symphysis pubis, a 2 or 4 holes, 4.5 or 3.5mm diameter dynamic compression plate or reconstruction plate can be used and fixed with full-thread cancellous bone screws.Another method of fixation is lag screw fixation. In patients with new sacroiliac joint dislocation with a forward approach,firm fixation can be achieved by using 2holes 3.5mm dynamic compression plates through the front of the sacroiliac joint. The posterior approach can also be used to insert 6.5mm lag screws into the sacral wings or hollow cancellous bone screws with interosseous compression for firm internal fixation. If available, the fracture may be fixed with 3.5mm or 4.5mm pelvic reconstruction plates and appropriate full-thread cancellous bone screws.
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