High-yielding Cultivation Technique of "One Increase and Four Change" Maize
One increase: a reasonable increase in planting density
Increasing density is a high production demand. Ensuring adequate density is a basic prerequisite for achieving high output. Reasonable increase in planting density is to adapt the planting density of corn to the requirements of the variety. In general, corn compacts for field compacting and compact maize are planted at 4000-4700 plants/mu, and high-yielding fields are 5000-5500; large-spike varieties are planted at 3200-3700 plants. / Mu, about 3,800 high-yielding fields (lower in Ludan 981, 3000-3300 in Daejeon, and 3300-3500 in high-yield field). The level of fertility and production indicators are not high. Do not use high density.
Increase the density of the main means: (1) change the species of compact type. (2) Reforming planting methods. Narrow the line to about 60 cm. Use large and small rows to improve ventilation and light transmission. (3) Improve the quality of sowing, prevent droughts and floods, prevent pests and diseases, and avoid the lack of seedlings and ridges. Improve uniformity and uniformity.
Four changes:
(I) Replanting resistant varieties
Characteristics of compact varieties: compact plant type, red leaves, small tassels, firm stems, leaf spacing, low ear position, and well-developed root system. Production performance is: density adaptability range, strong ability to respond to fertilization, resistance to lodging, less empty culms, uniform ears, good resistance to negative, not bald, full grouting.
(1) The compact and compact maize variety is 4000-4700 plants/mu. The main planting densities were: Zhengdan 958 (4500 plants/mu), Qidan 20 (4500 plants/mu), Ludan 984 (4500 plants/mu), and Ludan 9002 (4500 plants/mu). (2) Compact large ear varieties leave 3200-3700 strains/mu. Major planting densities: Ludan 981 (3000 plants/mu), Nongda 108 (3500 plants/mu), Jinhai 5 (3500 plants/mu), Denghai 11 (3000 plants/mu), Denghai 3 ( 3300 plants/mu).
(B) change the type of seed for the broadcast
The live broadcast is conducive to Miao Quan, uniform and strong, which facilitates mechanized operation, high uniformity, and reduction of pests and diseases. The disadvantage is that the accumulative temperature of the varieties with low temperature years and long growth periods is insufficient.
Live technology points (1) timely sowing. The best sowing time is June 1-15. (2) planting enough seeds. Seed sowing index requirements of the relative soil moisture content of 75%, visible precipitation conditions by sowing or hoeing sowing, or sowing corn in timely watering, to ensure that the emergence of neat. (3) appropriate sowing. The sowing amount is generally 2.5-3 kg/mu, which is increased or decreased according to the variety characteristics. (4) Line spacing and broadcast depth. Daejeon is generally 50-65 centimeters in size. When it is in large and small rows, it is 70-80 centimeters in length and 30-40 centimeters in distance. High-yield research and development should be conducted in large and small rows. The average row spacing of compacted varieties can also be reduced. Sowing depth is 3-5 cm.
(c) Change the application of coarse fertilization to formula fertilization
Based on the measurement of soil nutrients, fertilization programs, namely soil testing and formula fertilization, were determined according to various factors such as fertilizer absorption law, yield level, soil fertility, fertilizer nutrient content and utilization rate.
Maize fertilization technology: determine the amount of fertilizer according to the yield index and the basis of the soil fertility. Normal high-yield fields apply nitrogen (N) 3 kg, phosphorus (P2O5) 1-1.5 kg, and potassium (K2O) 2 kg to calculate the amount of fertilizer needed for every 100 kg of seeds produced. . The amount of fertilizer can be calculated by referring to soil test results and yield indicators. In view of the current status of corn fertilization, pay attention to the application of phosphorus, potassium fertilizer and trace fertilizer, and add 1 kg of zinc sulfate per acre to the zinc-deficient land. 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, sulfur and zinc fertilizers before the jointing of maize, and applied deep-seated ditching (15-20 cm) along the side of the seedlings to promote root and seedling growth. Pan-fertilizer is applied to the top 50% of the total nitrogen in the large bell-mouth period of corn, and it promotes large panicles and grains. Flower bud fertilizer applied 15%-20% of total nitrogen in grain filling stage to increase the photosynthetic capacity and increase grain weight.
(4) Changing Artificial Planting into Mechanized Operation
Machine broadcast: reduce the height of wheat stubble, to facilitate the corn machine broadcast. With compound fertilizer 10-15 kg per mu. Watering after sowing.
Human chorionic gonadotropin is a hormone for the maternal recognition of pregnancy produced by trophoblast cells
Human chorionic gonadotropin (HCG) is a glycoprotein secreted by trophoblast cells of the placenta And β dimer proteins. The molecular weight of glycoprotein hormone 36700, A. Pituitary, FSH, follicle stimulating hormone, LH (luteinizing hormone) and TSH (thyroid stimulating hormone) are basically similar, So they can cross-react with each other, while the structure of β subunit is not similar. In mature women, the fertilized ova move to the uterine cavity for implantation and form embryos. In the process of development and growth into the fetus, the placental syncytiotrophoblast cells produce a large amount of HCG, which can be excreted into urine through the blood circulation of pregnant women. Serum and urine HCG levels rise Rapidly from 1 to 2.5 weeks of gestation, reaching a peak at 8 weeks of gestation and dropping to moderate levels at 4 months of gestation, which remain at the end of gestation. At present, the commonly used detection methods are: latex aggregation inhibition test and hemagglutination inhibition test; Radioimmunoassay (RIA); Enzyme linked immunosorbent assay (ELISA); Monoclonal antibody colloidal gold test
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