"Say good half rice." Early rice seedlings have a direct impact on early rice yield and are related to the beginning of the year's grain production. According to the characteristics of rice seedlings, early-stage rice seedlings must be specifically managed in three stages.
The first stage: rooting is the green period, that is, the mud from the buds to the incomplete growth of the seedlings. The focus of the pharmacy is to manage the water well, ensure ventilation and oxygen supply, and promote the buds to take up the vertical needles to ensure a complete seedling. No matter what kind of childbirth method should adhere to moist without flooding, sunny ditch full of water, cloudy half ditch water. In the event of a low temperature cold wave in general, only the cover is added to the ground cover and it is not necessary to fill the water tank. In case of heavy rain, it may be filled with water in advance in order to prevent overturning and wash away buds. However, once the storm has passed, it should be immediately drained. In this period, the prevention and control of cotton rot should be well managed. The agent may be copper sulfate, enemy cough, etc.
The second stage: from the green to the three-leaf stage, when the seedlings are rooted and green, three true leaves grow. The focus of the pharmacy is on nursery, prevention of budding, buds and dead seedlings. After the buds are green, the cold resistance of the seedlings gradually weakens, and the cold resistance of the seedlings is the weakest in the 2 to 3 leaf stage, which is commonly called “weaning periodâ€. At this point, it is a crucial period for preventing rotting. The first thing to do is to regulate the relationship between water and air in Sakata and to insulate it with water. Membrane with holes may not be removed from the membrane. Only the surface of the membrane is kept wet; the membrane is not covered with holes, and the membrane is sealed and kept warm on rainy days and nights. When the temperature in the membrane is expected to exceed 30°C, it shall be uncovered at about 9:00 a.m. Film on both ends, ventilation and cooling; open earthworms in front of the two leaves do not generally need to be filled with deep water, only cover. After entering the two-leaf stage, the sunny days will be filled with shallow water tanks, and the rain will ditch and ditch the water. Before the low-temperature cold wave arrives, the deepwater protection seedlings will be put in place. After the cold wave, the water level will be lowered day by day to prevent physiological water loss and greenish dead seedlings. Secondly, timely application of “weaned fertilizerâ€, which consists mainly of decomposing human feces, can be applied at the time of one leaf period. At the same time, pay attention to pesticides to prevent rotting. When sowing in front of the three-leaf stage, half-groove water in the field, dry water in the yin-water field, and seedlings to two-leaf and one-heart, the weeds should be promptly controlled and retrenched.
The third stage: After the three-leaf stage, three true leaves grow from the seedlings before transplanting. The key to pharmacy management is to focus on strong seedlings. The first is the use of urea 5-6 kilograms of urea seedlings. The second is shallow water irrigation. It is necessary to prevent dehydration and prevent deep-water flooding. Putian water irrigation, the middle soil with soil moisture to dry seedlings, rinse seedlings, thin seedlings after the three-leaf period can be filled with shallow water, long-term wet and dry alternately controlled growth, before the extravasation of water in the end. The third is to apply the “send marrying manureâ€. Washing and transplanting pods should be applied about 5 days before transplanting, and banding should be applied 2 to 3 days before transplanting. Apply urea 2 to 3 kilograms per acre. Spreading should be re-application of fertilizer. The fourth is transplanting. Before the two-cultivated dry seedlings were 3.5 leaf-age leaves, before the floppy disk was dumped on the 4.1 leaves, the partition-casting or dry-feeding nanny could be thrown at a later stage. The three-matured system consists of a long-term drought and flood, 5.5 leaves of conventional rice, and 6.5 to 7.5 leaves of hybrid rice. Generally, they are harvested before and after harvest on May 10th. In conventional breeding, medium and small seedlings are transplanted from 2.5 to 3.5 leaves, which are transplanted around April 20th. Large seedlings are generally 5.1 leaves and transplanted between late April and early May.
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