The specific technical points for the cultivation of the condensed and super high yield of spring corn shrunken plants are as follows:
Increase organic manure fertility
For corn to achieve sustained high yield, fertility is the foundation. Application of 3-5-square-fertilizer, manure and other organic fertilizers per acre can increase soil organic matter, improve production conditions, fertility and improve land quality.
Ridging planting deep loose roots
Planted plots should be deep-sown in time after the harvest of the previous crop, with a depth of 30-35 cm. After loosening, it is used to smash, squeak and smash. The soil temperature during sowing was low, 30 cm of ridges were planted before sowing, and the ground temperature was increased to achieve Miao Qi Miao Zhuang.
Seed timely planting
The varieties that achieve super high-yielding constituency area are dense-type varieties, such as Zhengdan 958 and Xianyu 335. Artificially selected Seeds before sowing were used to remove crushing particles, insect-eaten grains, and diseased spots to ensure seed germination and purity. Corn Seed coating agent can be seeded by 1.5% of seed amount before sowing. The best sowing date for the northeastern spring corn area is from April 20 to May 10. If it is sown early, it will easily cause low temperature and rotten seed, and the emergence will be uneven. If it is sown too late, it will affect the corn growth and dehydration in the later period. Sowing depth should be determined according to soil moisture conditions and temperature conditions during spring sowing depth of 3-5 cm. Sowing when sowing increased by 10%, the general sowing volume of 4 kg, ultra-high yield fields can be increased to 5 kg, 5 leaf period to pull weak seedlings, leaving strong seedlings to ensure uniform seedlings, seedling strong, Miao Qi.
Increase density to build high-yield groups
To achieve a super-high yield level of more than 1,000 kilograms per mu, it must be suitable for dense planting, increase the density to over 5000 plants/mu, and determine the appropriate density of seedlings according to the variety characteristics and soil fertility levels. Zhengdan 958 must have more than 6,500 trees per acre and no less than 6,000 actual harvests. Xianyu 335 has 6000 seedlings per mu, and the actual income is not less than 5,500. Planting methods are 60 cm spacing and 18.5-20 cm spacing.
Chemical regulation shrinkage strong stalk lodging resistance
Production and test results show that the general maize phenotype is more than 4,500 plants/mu, which is prone to field lodging. Applying chemical control technology, spraying 300ppm of Jindele or Zhuangfengling corn regulator at the jointing stage of corn leaves, can reduce corn vegetative, stalk fineness, resistance to lodging, and does not change corn ear characteristics, construction The purpose of a high-yield group.
High-yield and high-efficiency fertilization
In general, high-yield fields require 3 kg of pure nitrogen, 1 kg of phosphorus, and 2 kg of potassium per 100 kg of grain. The high-yield spring maize field requires 50 kg of N fertilizer (urea), 50 kg of P fertilizer (superphosphate), and 25 kg of potash (potassium sulfate). For zinc-deficient land, 1 kg of zinc sulfate should be applied per mu. In fertilizer management, light Miaofei, heavy panicle fertilizer, make up for flowering grain fertilizer. Miaofei added about 30% of the total amount of nitrogen fertilizer to all phosphorus, potassium, and zinc fertilizers before the jointing of corn, and applied deep-seated ditching (15-20 cm) along the side of the seedlings to promote roots and strong seedlings. Panicle fertilizer in the corn big bell-mouth period (11-12 leaves unfolding) about 50% of the total application of nitrogen in order to promote panicle large grain. Flower bud fertilizer applied 15%-20% of total nitrogen in grain filling stage to increase the photosynthetic capacity and increase grain weight.
Disease prevention and pest control production increase
There are many diseases and pests of corn. Disease prevention and control firstly depends on the selection of disease-resistant varieties, such as leaf spot and stalk rot. The second is to adjust the sowing date, reduce the damage caused by the planthopper, and prevent the virus disease. Underground pests are controlled by seed coating agents or seed dressings, and corn borers are controlled by organophosphorus pesticides during the big bell mouth period.
Live broadcast late to increase seed production
Live corn, broadcast deep 3-5 cm, the same depth, to ensure Miao Qi, Miao whole, seedlings uniform. When the corn glutinous leaves in the field turn white and yellow, the grains have not been grouted, and they are late harvested. After delaying until the disappearance of the corn grain milk line, the appearance of the black layer, and the dryness of the temporal lobe, it is fully mature and then harvested. Heavy, increase production.
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