To achieve a super high yield of corn, maintaining soil fertility is crucial. Applying 3–5 square meters of manure or other organic fertilizers per mu can enhance soil organic matter, improve production conditions, and increase soil fertility and land quality.
Ridge planting is an effective technique. After harvesting the previous crop, perform timely subsoiling to a depth of 30–35 cm. Once the soil is loose, it should be compacted and leveled. Planting ridges should be raised by 30 cm before sowing, which helps raise the ground temperature and promotes strong seedling growth.
Timely and good seeding is essential. Selecting varieties that are resistant to dense planting, such as Zhengdan 958 and Xianyu 335, ensures better yields. Before sowing, manually select seeds to remove broken grains, insect-infested grains, and diseased kernels to ensure a high germination rate and purity. Seed dressing with a solution of 1.5% of the seed amount is recommended before sowing. The best time for spring corn sowing in the Northeast is between April 20th and May 10th. Sowing too early may cause cold damage, while sowing too late can affect growth and grain dehydration. The ideal sowing depth is 3–5 cm, depending on soil moisture and spring temperature. Increase the sowing amount by 10%, typically 4 kg per mu, and up to 5 kg for high-yield fields. At the 5-leaf stage, thin out weak seedlings to leave only the strongest ones.
Increasing planting density is key to building high-yield groups. To achieve over 1000 kg per mu, plant more than 5,000 plants per mu. Adjust the planting density according to variety characteristics and soil quality. For example, Zhengdan 958 requires more than 6,500 plants per acre, with an actual yield of at least 6,000. Xianyu 335 needs about 6,000 plants per mu, with a minimum yield of 5,500. Use a spacing of 60 cm between rows and 18.5–20 cm between plants.
Chemical regulation is important to reduce lodging. When the density of common corn varieties exceeds 4,500 plants per mu, lodging becomes a risk. Apply chemical regulators such as 300 ppm Jindele or Zhuangfengling during the jointing stage. This reduces plant height, strengthens stalks, and improves lodging resistance without affecting ear traits or grain quality.
Precision fertilization is essential for high yield and efficiency. For every 100 kg of grain produced, apply 3 kg of nitrogen, 1 kg of phosphorus, and 2 kg of potassium. Spring corn fields require 50 kg of nitrogen fertilizer (urea), 50 kg of phosphate fertilizer (superphosphate), and 25 kg of potassium fertilizer (potassium sulfate). If the soil is zinc-deficient, apply 1 kg of zinc sulfate per mu. Apply seedling fertilizer lightly, panicle fertilizer heavily, and supplement with grain fertilizer. Apply about 30% of the total nitrogen fertilizer along with all phosphorus, potassium, and zinc fertilizers during the seedling stage. Apply 50% of the total nitrogen fertilizer during the big bell stage (11th to 12th leaves) to promote grain development. During the grain filling stage, apply 15–20% of the total nitrogen to enhance photosynthesis and increase grain weight.
Disease and pest control is critical. Choose disease-resistant varieties to manage issues like large leaf spot and stem rot. Adjust the sowing date to minimize damage from gray planthoppers and prevent rough disease. Control underground pests with seed coatings and use organophosphorus pesticides during the big bell stage to manage corn borer infestations.
Live broadcast and late harvesting help increase yield. Sow corn at a consistent depth of 3–5 cm to ensure uniform emergence. Harvest when the leaves turn white and yellow, but the grains are still filling. Delay harvesting until the milk line disappears, the black layer appears, and the leaves are completely dry. This ensures maximum yield and quality.
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