New technique of Rice Seedling raising with perforated Film

1. The advantages of porous film seedling ① seedling quality is good, perforated film seedling adopts natural ventilation, ventilation is early, and the temperature in the bed changes slowly. The temperature difference between day and night is small, the seedlings do not grow, the seedlings are strong and do not get sick. The seedling quality is good and the seedling rate is high. It can increase the proportion of Honda seedlings by about 30%. ② has great potential to increase yield, seedlings do not shovel seedlings, do not hurt roots, the whole root under the ground to root quickly, early and rapid development, more low nodes, large spikes and more grains. ③ production cost is low, ventilation, water, fertilization, medication and other operations do not need to be exposed, labor-saving and labor-saving. It can also be used to drill holes and cover with waste greenhouse film to reduce the production cost. ④ method is feasible, and the method of raising seedlings with perforated film is simple, easy, convenient, practical and convenient for popularization and application. two。 Key points of perforated film seedling raising technology to prepare nutritious soil: select 70% garden soil or early field soil, add 30% mature agricultural fertilizer and sieve to form nutritious soil, each bed needs to prepare 200 kg of nutritious soil, and apply a bag of seedling strengthening agent with nutrition, acid regulation, disinfection and chemical control functions, and adjust the soil pH value to 4.5. 5. The preparation of high-quality nutritious soil provides balanced nutrition and acidic soil environment for seedlings to ensure the cultivation of strong seedlings. Soil preparation and sowing, choose garden or dry land to do 10 meters long, 1.5 meters wide bed, to the north-south direction, so that the bed soil is fine and free of debris. Then spread floppy disk or floppy disk substitute; above covered with nutritious soil 3 to 3.5 cm thick, pour enough bottom water, ready to raise seedlings. After selecting the seeds, soaking the seeds with chemicals to control rice evil seedling disease and so on. The time of raising seedlings is determined according to the time of water release from the reservoir. Yingkou area is usually from April 1 to 10, and sunny days are selected to raise seedlings. Sparse sowing is adopted to cultivate strong seedlings, and the sowing amount per square meter is 200 tons and 250 grams. Before sowing, a bottle of Yumaoling or Yaoqing (500g) was sprayed on the bed with 40 square meters of water 100 times to control rice seedling blight. After sowing and covering the soil, use seedling bed herbicides such as Yangmiaoling to seal the weeds. Then cover the plastic film, which is conducive to moisturizing and ensure the emergence of seedlings neatly and consistently. The upper insert frame is covered with a porous film, and the mulch film can also be covered with a porous film. Both of these methods of covering the film are fine. Seedling field management: seedling outcrop or bed whitening timely watering to ensure that the seedlings are strong. When the seedlings grow to 1 leaf and 1 heart, the plastic film should be removed in time for natural ventilation. At this time, the water on the bed evaporates quickly, so it is necessary to replenish water in time, and it is best to water once a day before the heart period of two leaves and one heart, and then reduce the watering times according to the actual situation. In order to effectively prevent the occurrence of rice vertical blight at the seedling stage, it is best to fight again at the stage of one leaf and one heart or two leaves and one heart. After the third leaf stage, nitrogen fertilizer should be applied in time to promote seedling growth, the amount of fertilizer applied each time should not exceed 50 grams per square meter, and liquid topdressing with 100 times liquid should be used. Plastic sheeting can be removed 10 days before transplanting. 3. Problems that should be paid attention to in raising seedlings with perforated film ① the pore diameter of perforated film is 1 cm and the pore distance is 3 cm × 3 cm. Too dense holes are not conducive to heat preservation and moisture preservation, and too sparse holes are not conducive to ventilation. The ② bed should be surrounded by a ridge 5 cm 10 cm higher than the bed surface and 20 cm wide, which is conducive to irrigation and operation. ③ dosing, watering, irrigation, fertilization and other operations do not need to uncover the plastic film, but can be carried out directly on the perforated film. It is better to have a green head in ④ sooner rather than later. In case of low temperature or cold wave during ⑤ ventilation, plastic film should be covered in time to keep warm or irrigate to prevent low temperature and cold damage. If the temperature in the high temperature bed exceeds 30 ℃, the film should be properly exposed and ventilated, so that the temperature in the bed should be controlled at about 25 ℃, so as to avoid excessive growth and reduce the seedling quality. ⑥ if the seedling growth is weak, the method of uncovering the cover at day and night and removing it later can be adopted to promote the seedling growth.