If corn wants to produce high-yield, it is necessary to understand the sowing time, growth cycle, fertilization method of corn, corn planted in spring, and it is difficult to think of high yield. Let's take a look at the small series of Hui Nong.
The corn planting time in spring is generally from the end of April to the beginning of May . When farmers are planting corn this spring, they must master the sowing time according to the temperature change. Otherwise, the corn seeds will be in the soil for too long, affecting the germination rate and the seeds that barely sprout. It is also weak seedlings. Spring corn is planted too early. It is just a high temperature and rainy season during pollination and grouting. It is prone to baldness or lack of grain. Not only the low yield, but also the pests and diseases will be very serious. Sowing from the first 15 to 20 days of local wheat harvest, the highest yielding spring maize can be harvested. When selecting spring maize seeds, it is necessary to select varieties with higher comprehensive index of adaptation to local weather, climate, resistance and stress resistance.
The growth cycle of corn is generally as follows: After the corn seeds are sowed, the swelling will be found on the first day, and the embryos will germinate. A week later, these small buds broke out and the yellow buds slowly turned green by the sun. In about 27 days, the seedlings gradually grew up and began to joint. At 52 days, the corn began to pull out the corn silk, and the male pollen appeared at the top. 90 to 100 days or so, males and females are fertilized, the longer the corn cobs grow, the more the corn filaments dry or fall off and grow into corn cobs.
Corn fertilization method
1. base fertilizer
All fertilizers can be used as base fertilizer. 2000 kg to 3000 kg of organic fertilizer, all phosphate fertilizer, 1 / 3 of potash as base fertilizer or seed fertilizer. The plough can be applied to the seeding ditch once in combination with the plough, and the fertilizer can be applied to the 10 to 15 cm plough layer.
2. Fertilizer
The application methods of the seed fertilizer include seed dressing, soaking, strip application and acupoint application. Seed dressing can be selected with micro-fertilizer, biological fertilizer, and acid, dissolve the fertilizer, spray on the corn seed, and spray while mixing, so that the fertilizer solution is evenly applied to the surface of the seed, and dried after sowing. Fertilizer is the most cost-effective method of fertilization. Potassium chloride, ammonium chloride, ammonium bicarbonate, urea, should not be used as seed fertilizer. Soaking method: The fertilizer is dissolved to a certain concentration, and the seeds are soaked in the solution for 12 hours, and then sown immediately after drying. Article application method: The fertilizer is suitable for strip application and acupoint application. The amount of fertilizer used for seed fertilizer is 2 to 5 kg. The fertilizer must be separated from the seed. Deep fertilization is better, and the depth is preferably 10 to 15 cm.
3. top dressing
The remaining two-thirds of the fertilizer is used for topdressing. Topdressing fertilizer, stalk fertilizer, panicle fertilizer and grain fertilizer are the four topdressing stages, and stalk fertilizer and panicle fertilizer are the main points.
Stalk fertilizer: Topdressing within 10 days after jointing can promote stem growth and promote young panicle differentiation. Take 1/3 of the nitrogen fertilizer in the top dressing as the jointing fertilizer, combined with the shovel, the distance between the fertilizer and the seedling is 5 to 7 cm.
Spike fertilizer: The remaining nitrogen fertilizer is applied in the big bell mouth period 10 to 15 days before the corn is drawn, which can promote the large grains of the ear and have good effect on the grain filling in the later stage.
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