Spring corn planting time in 2021

Spring corn requires the sowing date to be determined based on soil moisture and temperature. In early May, after autumn plowing and winter irrigation, spring white land should be harrowed in early spring to maintain moisture. High-yielding fields can be sown later if moisture conditions permit. The general sowing time is from late April to early May, or when the 5-10 cm ground temperature stabilizes at around 10°C, which is a suitable date for spring corn sowing, which is conducive to sowing all the corn seedlings in one go. (The climate varies from place to place, so the sowing time shall be subject to the specific local conditions)

It is recommended to use machine sowing or double columbine sowing in areas where conditions permit. Sow 2 kilograms per acre, separate seeds and fertilizer, and apply fertilizer below the seeds. 3-4 cm to prevent seedlings from burning and promote root penetration. If unconditional, you can dig a ditch with a small piece of wood and spread the seeds by hand. Generally, the amount of seed used per acre is 2.5-3 kilograms.

Spring corn variety selection

Spring corn should be selected with a growth period of more than 112 days, a well-developed root system, a compact plant shape, upturned leaves, strong growth, strong stress resistance, and a single ear. , Large-grain corn varieties. Before sowing, remove small, diseased and dead seeds and dry them in the sun for 2-3 days, which can enhance the water absorption capacity of the seeds, enable early emergence, and improve seed purity and seedling uniformity. Promote seed coating, which can effectively prevent and control underground pests and achieve early emergence.

Spring corn planting density

Spring corn sowing advocates equal row spacing and large ear corn varieties. The planting density is about 4,000 plants per acre, with row spacing of 67 cm and plant spacing of 25 cm. If late sowing or replanting occurs due to drought or freezing damage, medium-maturing compact varieties can be selected. Generally, about 5,000 seedlings per acre are left, with a row spacing of 67 cm and a plant spacing of 20 cm.

When 2-3 pieces of spring corn have emerged and unfolded, you can start thinning and remove weak seedlings and self-crossed seedlings. When the seedlings reach 3-4 unfolded leaves, the seedlings can be planted to retain strong, uniform seedlings. The criteria for strong corn seedlings are: wide leaves, multiple and deep roots, flat and thick stem base, stocky growth, and dark green seedling color.

1. Preparation before sowing

Before sowing, apply enough base fertilizer and create enough moisture. Apply about 4,000 kilograms of organic fertilizer and 5 kilograms of diammonium phosphate per acre. Plant according to the size of the rows, with a large row spacing of 0.6 to 0.8 meters and a small row spacing of 0.4 meters. Spray herbicides in small rows 3 to 5 days before sowing, and then cover them with mulch to kill weeds and increase ground temperature. Choose compact, fine corn varieties with a short growing season.

2. Sowing

Sow seeds from late February to early March, that is, before and after the Waking of Insects. Drill holes in small rows for sowing. The depth of the holes is 3 cm to 5 cm, and the distance between plants is about 18 cm. When sowing, pay attention to make sure that the two rows of corn are inserted into each other. The seeding rate is 4 kg to 4.5 kg per acre, and the soil is covered after sowing. Then cover the small arch shed on the mulch, with a roof height of 30 cm to 40 cm.

3. Field management

Field management is very important when planting fresh corn. Seedlings should be established early, around the 3-leaf stage. Pay attention to proper ventilation. When the corn reaches the shed, break the membrane in time to introduce the seedlings to avoid burning the seedlings. In addition to fertilizing and watering during key periods of corn growth and development, such as jointing, trumpeting, and tasseling, management should also be flexible and watering should be done in case of drought. When watering, you can add an appropriate amount of fertilizer with the water, preferably 10 kilograms of urea per acre.

4. Harvesting

Corn harvesting can be flexibly controlled. If the market price is high and the corn can be cooked, it can be harvested. If the market price is low, it can be harvested as ordinary corn, that is, when fully mature. According to measurements, if the corn is harvested after it is fully mature, the average yield per mu will be about 750 kilograms. After the early spring corn is harvested, another season of summer corn can be planted.

5. Spring corn focuses on preventing underground pests

Seed dressing. When planting spring corn, use seed coating agents such as carbofuran, imidacloprid, chlorpyrifos, etc. to prevent underground pests from harming the sown corn seeds.

Apply pesticides. When sowing, spread diazinon granules, chlorpyrifos granules, or phoxim granules evenly around the corn seeds at a rate of 6 to 8 kilograms per acre, and then cover with soil to effectively prevent underground pests from eating the corn. Underground roots.

Spray. When the corn seeds germinate and break through the soil and reveal leaves, spray the leaves every 5 to 7 days with 800 to 1000 times of 48% chlorpyrifos aqueous solution, or 800 to 1000 times of 50% phoxim mixture, or 1000 to 1500 times of 10% butyl sulfide. Carbofuran aqueous solution can be evenly sprayed on the leaves of seedlings and the soil at the roots to kill underground pests that harm the seedlings and protect the corn seedlings.