In order to rob the sensation, some growers often plant seeds too early because the ground temperature is low or the sensation is not good. After sowing the spring corn, it is often impossible to achieve the purpose of sowing seedlings and seedlings. Some will also appear in large areas without emergence. Now let us introduce the method to improve the yield of spring sowing silage corn.
Use a breed with a slightly longer growth period
Using the principle of temperature increase covered by plastic film, in the early maturing area with an accumulated temperature of 2500 °C, medium-maturing varieties with a growth period of less than 125 days can be selected. In the frost-free period of 120 days, the active accumulated temperature is in the area of ​​2700 °C, and the growth period can be selected from 125 to 135 days of late-maturing varieties.
Put a good seeding off
The mulch corn is generally to be broadcast 7 to 10 days earlier. 2 rows per bed, 2 to 3 capsules per hole, and then covered with fine wet soil, and properly suppressed, and the seedlings are released in time after emergence. The average yield per mu of silage corn (dry weight) was 1387.76 kg, which was 14.66% higher than that of the control Nongda 108.
Appropriate increase in density
Silage corn is planted in the North China region with a suitable density of 3,500 plants per mu, paying attention to timely harvest.
Apply a good base fertilizer
Re-application of base fertilizer, farmyard manure, and application of grain fertilizer. 50% of the total farmland fertilizer, planned total nitrogen application and 85% of the total phosphorus application, with the method of ditching as the base fertilizer, 15% of the phosphorus and 40% of the nitrogen fertilizer are applied to the "earing fertilizer", and the remaining 10% of the nitrogen fertilizer Apply "flower grain fertilizer".
Ground selection, sputum, film coating
1. Land selection
It is necessary to choose loose soil and high terrain, which is conducive to drainage and drainage.
2. Do bed fertilization
Before making a bed, first add 3,000 kg/mu of farmyard manure, 40 kg/mu of phosphate fertilizer, and mix 15 kg/mu of ammonium sulfate. Apply to the soil layer with a depth of 15 cm according to the line spacing, and then make a bed. The bed is 10-15 cm high and 60 cm wide, and the bed is about 1.2 m (including the bed height).
3. Laminating technology
Generally, a film with a width of 90 cm is used for filming before sowing. When the film is covered, the film should be tightly squashed, and a cross-belt is pressed every 5 to 10 meters on the bed surface to prevent the wind from blowing off and uncovering the film.
Strengthen field management
1. After the emergence of 3 to 4 leaf stage, the seedlings are fixed in time. In order to ensure the number of seedlings, the two plants are kept at the same time, and the marginal effect is exerted to increase the yield.
2. In the jointing stage and the big bell period, the urea should be properly applied depending on the seedling condition.
3. Conditional plots are watered in time and in the case of drought before and after heading.
4. In the high-humidity and rainy season from July to August, the film will be uncovered in time to prevent the ground temperature from being too high, affecting the vitality of the roots, preventing premature aging, enhancing the water storage capacity, meeting the water requirement for corn growth, and mulching the membrane to avoid environmental pollution.
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