In order to grab moisture, some growers often sow too early, because the ground temperature is low or the moisture is not good. After sowing spring corn, they often fail to achieve the goal of sowing all seedlings and growing seedlings. In some cases, a large area does not emerge. Now I will introduce the methods to increase the yield of spring sown corn silage.
Choose varieties with a longer growth period
Using the warming principle of mulching, in the early maturity area with an active accumulated temperature of 2500 ℃, medium-maturing varieties with a growth period of less than 125 days can be selected. In areas with a frost-free period of 120 days and an active accumulated temperature of 2700 ℃, the growth period can be selected at 125～ 135-day late variety.
Sowing off
Plastic-mulched corn is generally planted 7 to 10 days earlier. 2 rows per bed, 2 to 3 grains per hole, then cover tightly with fine wet soil, and appropriately suppress them, and promptly introduce the seedlings out of the film after emergence. The average biological yield per mu (dry weight) of silage corn was 1389.76 kg, which was 14.66% higher than that of the control Nongda 108.
Increase density appropriately
The suitable density of silage corn planted in North China is about 3,500 plants per mu, and pay attention to timely harvest.
Apply base fertilizer
Re-apply base fertilizer, farmyard manure, and good ear-grain fertilizer. Use all farm manures, 50% of the planned total nitrogen application and 85% of the total phosphorus application as base fertilizer, 15% phosphorus and 40% nitrogen topdressing "attack fertilizer", and the remaining 10% nitrogen topdressing Apply "flower-grain fertilizer".
Site selection, border making, film coating
1. Choose a place
Choose a plot with loose soil and high terrain, which is conducive to irrigation and drainage.
2. Do bed fertilization
Before making the bed, mix 3,000 kg/mu of farm manure, 40 kg/mu of phosphate fertilizer, and 15 kg/mu of ammonium sulfate. It is applied to the soil layer with a depth of 15 cm according to the row spacing, and then a bed is made. The bed is 10-15 cm high and 60 cm wide, and each bed is about 1.2 meters (including the bed height).
3. Laminating technology
Generally, a 90 cm wide mulching film is used for mulching before sowing. When mulching, the film should be tightened and buried tightly. A horizontal soil belt is pressed every 5 to 10 meters on the bed surface to prevent the strong wind from breaking and uncovering the mulching film.
Strengthen field management
1. The seedlings are fixed in time at the 3 to 4 leaf stage after emergence. In order to ensure the number of seedlings, keep two plants on the side to exert the marginal effect and increase the yield.
2. Respectively in the jointing stage and the big bell mouth stage, apply urea appropriately depending on the seedling situation.
3. Conditional plots should be watered in time in case of drought before and after heading.
4. In the high humidity and rainy season from July to August, remove the film in time to prevent excessive ground temperature from affecting root vitality, prevent premature aging, enhance water storage capacity, and meet the water requirements for corn growth. The film must be cleaned to avoid environmental pollution.
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