The southern rice region is characterized by low temperature and rain in spring, heavy rain in the spring and summer, high temperature and drought in early summer, and the use of “double control and double increase†as the supporting super-high-yield cultivation technology model and key technology for wet control and increasing grain growth (heavy). Development of spring corn planting in paddy fields.
Using this technology, we can effectively control soil water, reduce field moisture, control stalks, and prevent premature senescence in high density conditions, so as to achieve the effect of increasing grain growth and finally increasing yield. The main points are:
First, we must select good hybrid varieties, medium-mature (semi-) compact big-ear corn varieties, such as Denghai No. 11, to coordinate the contradiction between large spikes and multiple ears of corn in paddy fields.
Timely incubation of nursery. In the middle and middle of March, nutrition pods or nuggets were sown, and the film was covered with heat and seedlings. Seeded bed per cubic cubic nutrient soil mixed with pig fecal slag 2 Tam, fire and earth ash 3 Tam, plus 200 grams of Diocesan disinfection.
Wide and narrow row high and low ridge compartment cultivation. Every 2 rows of narrow rows constitute a low ridge compartment, 2 compartments constitute a high ridge compartment, and between the compartments are wide and high ridges, and are planted in wide and narrow rows, with a width of 70-80 cm and a narrow row of 35-40 cm. .
Timely density transplanting. Maize 3 leaves 1 heart is selected for transplanting of the weather, semi-compact varieties such as Denghai No. 11 transplanted 3000-4000 per mu, flat types such as Linnong No. 1 transplanted 2500-3500 per mu. On the basis of wide and narrow lines, adjust the spacing between the plants to ensure the density.
Rational fertilization. Reuse of organic manure, combined application of nitrogen, phosphorus, potassium and zinc, the ratio of N, P and K was 1:0.46:1.06. Phosphate fertilizers were all used as base fertilizers, 70% of potassium fertilizer was used as base fertilizer, and 30% was used as panicle fertilizer. About 15 kg of pure nitrogen, according to basal fertilizer: jointing fertilizer: panicle fertilizer for 3:2:5 application. Basal fertilizers are preferably compound fertilizers and organic fertilizers. Determine the shade of leaves in the tasseling period to determine whether to add a top dressing. After pumping, spray 0.25 kg potassium dihydrogen phosphate per acre.
Chemical control strong stalk control lodging. In order to overcome the weakness of the super-high-yielding cultivation plants with large lodging risks, 7-10 tablets of full-spreading leaves or about 15 days before the tasselling sprayed with an anti-fighting agent (such as “Kindeâ€) The height drops about 10 centimeters or the average height of the plant decreases by about 20 centimeters. At the same time, the stem is strong and straight, and the aerial root is developed.
Auxiliary pollination increased the average grain number. Artificial silk-assisted pollination during flowering of silkworms enhances corn's robustness and reduces baldness. Method: Use bamboo rafts to beat between the rows of plants to increase the probability of pollination, or use a brush to take the pollen directly on the spinning silk. After the end of pollination, the tassels were cut off in time to reduce nutrient depletion, increase ventilation, transmit light, strengthen photosynthesis, and reduce pests and diseases. At the same time, clean the pastoral areas, pick up the weeds on the old leaves of the base and the car blocks, increase the ventilation and light transmission conditions between the lines, and reduce the pests and diseases.
Integrated pest management. On the basis of physical control, the application of chemical pesticides will be determined according to the period of childbirth and the condition of diseases and insect pests. Special attention will be paid to the control of sheath blight, corn borer, armyworm, and aphids. During the seedling stage, the enemy killed 3000 times liquid to control the ground tiger. Corn sheath blight can be treated alternately with Jinggangmycin and Janssen from the time of jointing.
Timely harvest. After the tiller leaves dry, the grain milk line disappears, and when the base black layer appears, it is harvested.
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