How to seedling rice can be high-yielding, stacked tray out of seedlings seedling technology points are what

Rice is an important food crop in China, has a very important position in our country, has an important role in the stability of society. In recent years, with the increase of rice planting income, more and more people began to plant rice. But in the process of rice planting, seedling is very important, then the seedling of rice need to do what we do? How to seedling to make rice high yield?

Technical points

(1) Variety selection. Considering local conditions, planting systems, planting seasons, production methods and other factors, according to the previous crop and the next crop to choose rice varieties that can ensure the safety of the whole spike. In the double-season rice area, attention should be paid to the reasonable matching of fertility of early rice and continuous late rice varieties.

(2) seed treatment. The seed germination rate of conventional rice and hybrid rice is above 90% and 85% respectively. Seed treatment includes seed selection, seed soaking, sterilization and germination. Seeds should be dried for 1-2 days to improve germination potential and germination rate, and then seeds should be selected with saline or water. After 48 hours of soaking and disinfecting, rinse with water to promote germination and use appropriate temperature to promote germination. Germination should be "fast, flush, even and strong", and the temperature should be controlled at about 35℃. When the seeds are exposed, they can be sown after sowing and drying.

(3) Seedling or substrate preparation. Dryland soil or seedling substrate with fertilizer and acid adjustment can be selected for seedling. Dryland seedling should choose fertile soil with neutral acid value, good porosity and aeration, high organic matter content, no grass seeds, no source of pests and diseases. In order to prevent greening disease, soil acid regulation and sterilization should be done; it is recommended to use special seedling substrate for rice machine transplanting to ensure seedling safety and cultivate strong seedlings.

(4) Suitable sowing period. Timely sowing, China's southern early rice will be in warm temperatures, seedling age of 25-30 days in March sowing; southern single-season rice is generally sown in mid-late May to early June, seedling age of 15-20 days; continuous late rice sowing period according to the early harvesting of rice reasonable arrangements, seedling age of 15-20 days.

(5) streamline precision sowing. According to the type of variety, season and seedling tray specifications to reasonably determine the amount of seeding, to achieve precision sowing. South China's double-season conventional rice 9-inch seeding tray sowing volume is generally 100-120g / disk, about 30 disks per mu; hybrid rice sowing volume can be appropriately reduced according to the growth characteristics of varieties. Single-season hybrid rice 9-inch seedling tray sowing amount is 70-100g / disk, 7-inch seedling tray according to the area to adjust accordingly. Selection of stacking trays dark out special seedling trays, the use of uniform sowing, sowing amount control accurate, watering appropriate machine insertion sowing line, a one-time completion of the tray, spreading, pressing, watering, sowing, covering. The end of the assembly line can be equipped with stacking mechanism and automatic feeding equipment. Do a good job of mechanical debugging before sowing, adjusting the amount of seeding, bed spreading, covering and watering.

(6) Stacked disks appear in the dark. After sowing, the seedling discs are stacked on the assembly line, every 25 discs are stacked, a seedling disc containing soil but not sown is placed at the top, 6 stacks of seedling discs are placed, each disc is about 150 discs, and the seedling discs are transported with a forklift truck to the dark seedling emergence room with temperature control and humidity control. The temperature was controlled at about 32°C and the humidity was controlled at over 90%. It was left for 48-72 hours, and when the seed shoot needles were erect (shoot length 0.5-1.0 cm), they were removed by forklift and supplied to each nursery site.

(7) Growing seedlings by placing trays. Early rice is placed on plastic greenhouses or seedling plates with arched sheds to keep them warm and moist. Single-season rice and continuous late rice can be placed directly on seedling boards or, if possible, put in insect-proof nets and raise seedlings in greenhouses.

(8) seedling management. After sowing early rice in the southern rice area, it should be covered with a film to keep warm and nurture the seedlings. Shelter temperature control at 22-25 ℃, the highest not more than 30 ℃, the lowest not less than 10 ℃. Pay attention to ventilation, timely seedling refining, to prevent rotten seedlings, burn seedlings. Pay attention to water control, using dry nursery, pay attention to the prevention and control of pests and diseases in the seedling period, especially the prevention and control of green blight and malignant pathogens.

(9) strong seedling requirements. Seedlings should have a developed root system, suitable seedling height, strong stem, green leaves, neat and tidy. Early rice in the south has 3.1-3.5 leaves, seedling height of 12-18cm, and seedling age of 25-30d; single-season rice and late rice have 3.5-4.5 leaves, seedling height of 12-20cm, and seedling age of 15-20d.

(10) Pest control. Focus on the prevention and control of green blight, malignant disease and rice thrips during the seedling stage. To prevent and control green blight, the first thing to do is to prepare the seedbed and adjust the acid. For neutral or weakly alkaline soil, it is necessary to apply seedling-strengthening agent or acid-adjusting agent for soil acid-adjusting treatment to regulate the pH value below 6.0, and at the same time, do a good job of soil disinfection; for the control of malignant plague, the first step is to choose disease-resistant varieties, avoid planting susceptible varieties, and do a good job of seed disinfection. It is recommended that the seeds be dipped with cyanoethylene ester, mizanam and other agents according to the dosage, and advocate the use of medicated plugs.

Suitable area

It is suitable for popularization and application in rice production in the middle and lower reaches of the country, South China and Southwest China.

Preventive measures

1. Early rice seed pile tray out, seedling tray transported out of the dark room. The temperature difference between indoor and outdoor should not be too large. Before transportation, pay attention to the dark room ventilation and cooling for 1-2 hours, and then move the seedling tray out of the dark room.

2. At present, there are many rice seedlings being produced in the south. Seedlings are cultivated in greenhouses. In order to improve the resilience of the seedlings, it is necessary to refine the seedlings before transplanting by machine.