First, choose the dense, medium, large and medium-ripe varieties: plant more than 3800 varieties of maize that do not fall, resist the sheath blight, stem rot, drought and high temperature in the hilly area , and have more rows of spikes ( 16-18) Line), the length of the tassels, 600-700 grains per panicle , and the weight of a single ear can reach more than 170 grams. According to the screening comparison, the corn varieties can be selected according to local conditions.
   Second, the appropriate period spring, wide and narrow row close planting: suitable for sowing in late mid-March. In order to enhance inter-row permeability, reduce field humidity, and tap the potential of light and heat resources in high-density planting, high-yield fields are planted in wide and narrow rows. Sichuan's best wide and narrow rows are planted with a wide line spacing of 1.17 meters and a narrow row spacing of 0.5. Rice, no less than 3700 plants, ensure 3,500 ears are harvested .
   Third, the film is warmed, standardized seedling: Sichuan corn main production area soil "acid, sticky, thin, thin", live broadcast varies in depth, emergence is not neat, "one step can not keep up, step by step can not keep up." Seedling transplanting can ensure corn seedlings, seedlings, and seedlings. Method of warming and raising seedlings: ( 1 ) Selecting the fertile vegetable garden of leeward sun, first digging and leveling, making a seedbed of 1.3-1.7 m wide, which is convenient for covering film, management and seedling; ( 2 ) Preparation of nutrient soil 30 %-40% of decomposed organic slag, 60-70% of fertile fine soil as matrix, add 1 kg of superphosphate and 0.1 kg of urea per 100 kg of soil . After mixing evenly, add manure to the hand. It is advisable to form a group and touch the ground. ( 3 ) After loading the nutrient soil to 80% of the nutrition cup or floppy disk , the number of seedlings in the compacted seedbed should be more than 10% of the planned number of seedlings ; ( 4 ) Seed 1-2 capsules per cup or per hole , sprinkle the soil cover with a thickness of not less than 1 cm, and use the prepared 2 m long bamboo piece to hang the arch on the seedbed, and then cover the 2 m wide agricultural film. The surrounding soil pressure is strict. After emergence, timely watering and uncovering the film to prevent seedlings.
   Fourth, ditch base fertilizer, film side cultivation: After the corn seedlings are finished, open the corn in the corn planting field, and deepen the narrow row, and dig a “fertilizer ditch†with a depth of 20 cm and a width of 20 cm between the narrow rows . First spread the chemical fertilizer on the lower layer of the ditch, and then spread the farmer's fertilizer. After fertilization, the soil is made into a tile-back type shallow ridge, waiting for the rain to be covered with a 50 cm wide ultra-thin film. The quality of the cover film requires a smooth surface and a luminous surface of about 70% . When the seedbed corn reaches one leaf and one heart, the corn seedlings are graded, oriented, and the wrong nests are transplanted at the margin of the cover film. The corn is 2 rows per ridge , and the row spacing is 50 cm. After transplanting, the soil will be transplanted and the hole is tightly covered. The area can be poured once to fix the root water and promote root system.
   Fifth, early seedling fertilizer, phosphorus to promote nitrogen to promote seedlings: 4-6 leaves is the critical period of phosphorus demand for corn, easy to cause insufficient supply of soil available phosphorus, this time should be combined with cultivating and weeding early seedling fertilizer, topdressing quantity: mu 20 kg of superphosphate was applied, and 5-6 kg of urea was applied to 500 kg of human and animal manure to promote seedling growth.
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