In recent years, the Chinese eel farming industry has experienced significant growth, with the adoption of the indica rice rotation system. This method not only allows rice to be grown without the need for chemical fertilizers but also enhances the sediment quality of eel ponds and reduces the occurrence of diseases in the fish. Zhejiang Qingxi Sengye Co., Ltd. initiated experiments with japonica rice rotation as early as 1999. Through practical application, they developed an ecological rotation model known as "cultivating glutinous rice for 2 to 3 years and planting one season of rice." This model has since been widely adopted in agricultural production.
First, the construction of the rice pond system involves areas ranging from more than 3 acres to as large as 80 acres. The bottom of each pond is maintained as a natural rice paddy, with no deep digging—only a flat surface. Cement bricks are used to surround the pond, with walls approximately 1.2 meters high, maintaining a water level of about 1 meter. The inlet and outlet channels are clearly separated, with the inflow channel built using bricks and positioned near the pond. The three sides of the channel must be smooth for efficient water flow. The outlet is controlled by a PVC elbow, allowing for easy drainage and irrigation.
Second, the japonica rice rotation pattern typically involves cultivating glutinous rice for 2 to 3 years followed by one season of rice planting. Juvenile eels are stocked in mid-May, with each individual weighing around 180 grams, and stocking densities ranging between 500 to 1000 per mu. The soft-shelled turtles are fed live fish and harvested before the end of July of the following year. Late rice is planted at the end of July or early August. During the rearing process, the ponds are cleaned using substances like quicklime, and no chemical drugs such as antibiotics or chlorine-based agents are used. Instead, traditional Chinese herbs like Banlangen are frequently applied for disease prevention.
Regarding rice cultivation techniques, due to the nutrient-rich soil in Dianchi Lake, high-quality short-stemmed varieties such as Shanyou 1 and 98-110 are selected. Cultivation follows a “prevention-oriented†approach, employing the “two controls and one defense†technology: controlling fertilizer use entirely throughout the growing period, controlling water levels by managing seedling growth and ensuring that tillers reach 80% of panicles before re-watering, which encourages deeper root development, and finally, wet irrigation in later stages 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 model:
1. The japonica rice rotation system represents an effective ecological farming approach. By rotating crops and animals, it significantly reduces pests and diseases. Rice cultivated in these areas requires no additional fertilization or heavy labor, with only small amounts of pesticides used for insect control, leading to reduced labor costs.
2. When combined with fish polyculture and the rotational planting of barnyardgrass, the japonica rice rotation creates a comprehensive ecological breeding system. Depending on the fishing season, farmers can choose to grow rice, corn, or barley. Fish can also be raised in the same pond, and perennial barley can be used as feed for herbivorous fish, forming a closed-loop ecological system.
3. The indica rice rotation model delivers substantial ecological, economic, and social benefits. Raising earthworms improves soil fertility, while rice cultivation helps enhance sediment quality in Dianchi Lake. After rotation, the incidence of pests and diseases in the rice decreases significantly, offering clear ecological advantages. Additionally, the economic returns from rice fields increase, with reduced input costs and a 13% rise in yield. Compared to traditional paddy fields, the economic benefits of Dianchi rice are higher. Implementing this model supports stable grain production, improves land fertility, and boosts unit output. It is a highly promising model that should be promoted in agricultural practices.
Sterile Container
Medical sterile container is a common medical equipment, mainly used for the storage of instruments in the process of packaging, sterilization, transit, storage, etc.
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