Maize ear period refers to the period of time from jointing of corn to heading. Summer corn has a short growth period, high temperature and humidity during growth, and fast growth and development of corn. Generally, the joints start to sprout at about 20 days after emergence. The roots, stems and leaves of corn grow vigorously during this period. At the same time, the ear and ear of females start to differentiate one after another.
Management at the ear stage is the most important field management period in corn. This period of field management is to coordinate the growth of vegetative and reproductive growth, so that a balanced development, and finally achieve the purpose of promoting stalks.
The stalk spurs and the ear buds are slightly sequential in time. The role of fertilization at the jointing stage is mainly stalk stimulating and supplemented by strong ears. If there is too much fertilizer or water in the soil during this period, stems and leaves will be lengthy, and the shoots will be 1-3. Slender sections of the festival, the site of the spikes are raised, and it is easy to fall and break when encountering wind and rain. Therefore, if fertilization is appropriate during the jointing period. Better fertility can not be fertilized during this period.
10-15 days before corn earing, due to the rapid growth of vegetative growth and reproductive growth, it is sensitive to fertilizer and water conditions, so it is the period when corn needs fertilizer and water most. It should be fat and water assault, and spikes and grains should be increased. , And can make the ear above the joint elongation, the spacing between the leaves, is conducive to receiving sunlight, the production of nutrients, especially the photosynthetic product of the upper middle leaves is an important source of nutrients during the development of the ear. Therefore, large bell-mouth fertilizers and adequate water are the key measures for obtaining large spikes and grains. If this period of drought, lack of fertilizer, the inevitable growth of stems and leaves weakened, resulting in male and female flowering infertility, resulting in reduced production.
The big bell-mouth fertilization is the most important fertilization period in corn life. Under the condition of early basic fertilizer and sufficient phosphorus and potassium fertilizer, nitrogen fertilizer is the main fertilizer. The land with a yield of 1,000 kg of corn kernels per mu and 30-40 kg of urea per mu can meet the needs. The land of 1300 jin of corn grain per mu can be produced, and 50-70 kg of urea can be used to meet the needs. A plot of 1500 acres of corn grain can be applied to 80-90 kg of urea. Other nitrogen fertilizers can also be used, the amount of which is based on the urea standard. Each specific fertilization amount should be comprehensively considered based on various factors such as the amount of fertilization during maize growth period, fertility, and expected yield per mu. Fertilization methods to avoid surface spraying.
The effects of water shortages on the yield per plant of corn in different growth periods are different. Overall, the lack of water caused by water shortage during the silking stage results in the largest loss. The effect of water shortage on the yield per plant during different growth periods is the lowest point Flat V-shaped curve. That is to say, the seedling stage needs drought; the silking stage is the most drought-prone, and the time when the drought occurs is closer to the silking stage and the yield is reduced. The silking stage is the “critical period†of the corn water requirement. Therefore, there is an experience of "flowering without irrigation and half production reduction" in production.
Another key point in the management of the panicle stage is the control of corn mash, which can be brewed with phoxim or 660 granules during the big bell mouth period, and can also be applied to granulin. The cultivation of cultivating soil is also an important part of corn ear management. The time for soil cultivation must be completed before the mulching. The role of cultivating soil is to promote root development, prevent lodging, facilitate drainage, and bury weeds. Earthing height 7-8 cm can be. The suitable conditions for soil cultivation are clay land, wetlands, windy and rainy years, and windy and rainy areas.
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