The soil moisture content at the time of sowing is appropriate to reach 60% to 70% of the field water capacity. The suitable soil moisture content for spring corn sowing is 20% to 24% for black soil, 18% to 21% for alluvial soil and 15% to 18% for sandy loam soil. %, when the soil moisture content is high, it should be sown after moderate scab; if the soil moisture content is insufficient, use water to sow seeding.
The amount of broadcast. According to the seed germination rate, planting density requirements, etc., it is required that the seeding amount be stable and the seeding be uniform. The deviation of the number of seeds per hole in the hole sowing should not exceed the regulation. Single seeding requires one seed per hole, uniform plant spacing, single grain rate ≥ 90%, and porosity less than 5%. In general, the amount of mu seed used for seeding is 3 to 4 kg, on-demand is 2 to 3 kg, and precision seeding is 1 to 1.5 kg. The number of seeds required for single seeding and 1 seed per hole is calculated as follows. If 2 to 3 seeds per hole, it needs to be expanded by 2 to 3 times.
Deep sowing. According to soil moisture, texture and seed size, it is determined that after sowing, the depth of sowing in black soil is generally 3 to 5 centimeters, the depth of sowing in white pulp soil and saline-alkali soil is 3 to 4 centimeters, and the sand depth in soil is 5 to 6 centimeters. Not more than 10 cm. The standard for mechanical operation is that the broadcast depth error should be no more than 1 cm.
Crackdown. Compaction after sowing can increase the degree of compaction of the upper layer of the soil, so that the lower layer of water increases, the seeds closely contact the soil, which is conducive to seed germination. Appropriate compaction in dry areas and windy areas is an effective measure to ensure the entire seedlings. The time of repression depends on soil moisture, and the soil moisture around the seed is about 80% of the field water holding capacity (hand clumping, throwing ground to spread, and surface soil repressing when the wind is dry).
Fertilizer. General mu compound (mixed) fertilizer or diammonium phosphate 4 ~ 7 kg (when the spring corn seeding can meet the low temperature can be applied diammonium phosphate as seed fertilizer), the fertilizer should be buried and avoid direct contact with the seed, fertilizer can be applied at the same time, fertilizer Ensure that the roots are not burned or sprouted at the sides 5 to 6 cm from the seeds. Urea, ammonium bicarbonate, etc. should not be used as seed fertilizer to avoid burning seed and burning seedlings. In the autumn, sufficient fertilizer can be used without seed fertilizer.
other requirements. Seed damage rate is small, broadcast straight, the deviation around the seed is not greater than 4 cm, consistent row spacing, neat land, no rebroadcast, no leakage broadcast. When the joint sowing can complete fertilization, spraying, spraying herbicides and other operations.
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