New techniques of Summer Rice breeding

The technique of raising seedlings of summer rice is very important, and the quality of seedlings directly affects the growth and yield of rice in the field.

1. Choose a variety. New rice varieties with strong growth, strong tillers, short growth period, high yield, good waxy rice quality, white color and strong aroma should be selected to adapt to local growth. The main variety suitable for planting in Haiyang area is glutinous rice.

two。 The choice of seedling field. The land with flat topography, fertile geology, convenient management and convenient drainage and irrigation should be selected, and the area of seedling raising field and summer rice should be planted according to the ratio of 1 ∶ 25.

3. Fertilize the whole bed. In early spring, every 667 square meters (1 mu), the soil and miscellaneous fertilizer is 3000kg and 5000kg, and the depth of cultivated land is 1520cm, without raking the land. The ground was raked and leveled in late April to prepare the bed. The border is 10cm to 15cm high, 100cm or 130cm wide and unlimited in length. After raising the border, apply 5080 kg potassium sulfate compound fertilizer every 667 square meters, spread it evenly on the border surface, and then rake the border surface to prepare for raising seedlings.

4. Seed treatment. After drying the seeds for 1-2 days before raising seedlings, soak the seeds with 50% carbendazim 600 times solution for 8-10 hours, fish out the rice seeds, rinse them with clean water, soak the seeds with clean water for 48 hours, and dry them for 2-3 hours.

5. Sow seeds at the right time. Sowing in early May, 10-15 days later than the sowing time of spring transplanting rice, flooded the finished seedling raising land in the morning, soaked the border surface for 3-4 hours, and generally raked the flooded border surface again at 2 pm to level the border surface of the same plot. Then drain the water from the seedling field, spread the treated rice seeds evenly on the border surface according to the dry seed weight of 0.15 kg per square meter, and then gently rub the seeds into the ground with wood or iron grip, with a depth of 3 cm. Then cover the polyethylene film produced by regular manufacturers with a thickness of 0.006 mm and a width of 100mm to 130cm, flatten the film and stick it on the border surface without tightening, and press the film around with ditch mud to prevent the wind from damaging the film and affecting the evenness of seedling emergence.

6. Seedling field management. First, timely film collection: the seedling field is not watered during film mulching, about 7 days, the seeds break the top film of the soil. Under normal circumstances, after the seedlings grow 2-3 leaves (2 leaves and 1 heart) in the film for 10-15 days, flood the seedling field in the morning, put away the plastic film, and the water can soak through the seedlings. Second, timely topdressing: after film harvesting, 10 kg of high-nitrogen and high-potassium compound fertilizer was evenly applied to every 667 square meters of seedlings, and then irrigated once every 5-7 days, and the water surface should not exceed the center of the seedlings, once every 15-20 days. When the seedlings grow to 6 leaves and 1 heart, they can be planted in the field. Because the time of raising seedlings of summer rice is late and the temperature is high, attention should be paid to water control, fertilizer control and disease prevention during seedling growth so as not to cause old diseased seedlings. 7-10 days before transplanting seedlings in the field, 7.5 kg of urea was topdressing every 667 square meters.

7. Prevention and control of diseases. The seedlings were sprayed with 50% carbendazim 500 × 800 times to control leaf rust, leaf spot and rice blast and ensure the quality of seedlings.