1, after planting - jointing section of the long thick stage management. This period is a crucial period for the fight for fresh corn to promote early development and build a high-yield shelf, so we must do the following: 2, booting - harvest management. (1) Heavy panicle fertilizer: This fertilizer is the crucial period for determining the size of panicles, the number of panicles and the high yield. The use of panicle fertilizer should be controlled after the jointing of corn, the stamen and floret differentiation (before silking, tasselling), specifically to see the amount of plant leaf growth, the general spring sowing can be seen in the leaves 13-14, the summer sowing of corn 12-13, is to chase The best period of application of panicle fertilizer, generally about 15 kg per mu urea is appropriate. 3, timely harvest The harvest period of common waxy corn is about 25 days after spring sowing and pollination, and 22-23 days after summer sowing, that is, the middle grain of the hand-sharpened stick is paste-like, but there is no slurry, and the appearance of filaments turns dark brown and can be harvested. If the temperature during mature period is high and the speed of grouting is faster, it must be checked carefully to make sure that it matures and harvests a batch to ensure the quality and taste of the ear and ensure high quality and high quality of the product. Beijing Yanjing Golden Agricultural Science and Technology Development Center Address: Institute of Soil Fertility, Chinese Academy of Agricultural Sciences
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(1) Grasp the temperature and remove the film in time. If the plot is covered with multiple membranes, it is necessary to pay attention to the temperature of the greenhouse, which is generally controlled at 25-30°C. In case of high temperature weather, the ventilation of the lee should be promptly carried out. When the temperature is above 10°C at night, the shed is not open, which is conducive to widening the temperature difference and making the ring-growing maize grow robustly. When the nighttime temperature is stable above 12°C, the film is removed in time, and the time is about April 15-20. According to weather forecast, when the maximum temperature is ≥23°C, we must be alert to high temperature damage to corn in the ditch.
(2) Do a good job of cleaning the trenches in time. During the growth period of corn, it is afraid of water, and it is afraid of drought. The gully system must be deepened and cleaned longitudinally, laterally, and out of the gutter in order to achieve energy irrigation and drainage.
(3) To eradicate pests and diseases in time. After transplanting corn, it will be harmed by ground tigers and aphids and must be used promptly. Ground tigers were baited with trichlorfon poison baits, and aphids were treated with imidacloprid.
(4) Timely exploitation. Maize is a single-spike crop. The seedlings that occur in the roots are not likely to form plants, and the emerged tillers are inefficiently consumed nutrients and should be removed once they are found.
(5) Look at Miao Shi's long and thick fattening section. This period is a crucial period for the formation of a large group of individuals with strong maize. Although there are more fertilizers in the early stages, due to poor soil fertility in some plots, the growth performance of the maize leaves fades, the stem sheaths appear reddish, and parts of the stems may appear red. Weak seedlings should be supplemented with joint long-term coarse and balanced fertilizers in a timely manner. Generally, about 10 kg of urea is applied.
(2) Strip the excess ears. After corn silking, it often produces multiple spikes on the same strain. If it is not stripped in time, nutrients will be dispersed, and large spikes will be difficult to form. When peeling, only one upper ear is left, so that the spikes are large, the grain is full, and the grains are full. Do not damage stems and leaves.
(3) Drought resistance. Maize grows to the booting stage, which is the peak period of corn water demand. If there is a continuous high temperature and drought, it must be drought-resistant and add water in time, and if necessary, furrow irrigation and rapid drainage.
(4) Insect pest control: The occurrence of corn borer and aphid in the later growth period of corn largely affects the commodity value of fresh corn. Especially corn planted in summer and autumn sowing, therefore, the growth of corn is controlled at the big bell-mouth stage and silking stage. In the case of prevention and control, diphtheria and imidacloprid may be used to dilute and spray, the use of organophosphorus pesticides may be prohibited, and the prevention and control of biological pesticides may be promoted. 