Can you apply foliar fertilizer when corn is about to emerge?

*Yes**, corn can be fertilized with foliar fertilizer before it emerges. However, it is not necessary to spray foliar fertilizer at every period, as too frequent spraying may have a negative impact on maize growth.

Foliar fertilizer spraying is recommended during the peak nutrient demand of maize, which includes the pre-emergence stage, jointing stage, and large flare stage. If the corn seedlings are weak in the early stage, they can be sprayed in advance, while if the seedlings are strong, there is no need to spray in the early stage. Spraying at the jointing stage can provide nutrients in time, which is of great help to high yield in the later stage.

At the same time, it is also critical to spray foliar fertilizer when the corn has 10 13 leaves (entering the big flare stage), as these are the peak periods of corn nutrient demand.

It is not recommended to spray foliar fertilizer before 4 leaves of corn, but after 4 leaves, it is possible to spray foliar fertilizer.

Corn fertilization management.

From the tasseling stage to the flowering stage, the plants basically stop growing, and the consumption of nitrogen accounts for about one-fifth of the entire growth period, phosphorus accounts for about one-fifth, and potassium accounts for about one-third. Once the filling begins, the amount of fertilizer required for the corn increases rapidly, forming proteins, starches, and fats in the grain until the grain is ripe. This period absorbs about half of the nitrogen and about one-third of the phosphorus during the entire growth period.

Common mistakes in fat dressings. Fertilization is applied too late. I am used to the tassel fat before and after, but I don't know that I have missed the best period at this time.

When planting, pour all the fertilizer into the plant at once, or pour all the fertilizer into the cover water.

Look at the sky, fertilize. Regardless of the growth characteristics of the corn, fertilize it when it rains. Scientifically set target outputs.

For example, the yield of corn in the same field for several consecutive years is 800 catties, and this year's target yield of 1,800 catties is unscientific. Although scientific fertilization technology can improve yield, soil carrying capacity is also a very important factor restricting yield. It would be more scientific to increase the output by about 15% on the basis of the average output for three consecutive years.

Consider soil fertility.

In addition, "shelling" is best to apply controlled-release fertilizer, and the ratio of nitrogen, phosphorus and potassium (28-5-9) is close to optimal, the number of acres of fertilizer is 80 catties, and fertilizer can be planted or 3 leaf stage joint time one-time application. It should be noted that in order to prevent the seedlings from burning during fertilization, holes or strips should be made at a depth of 6-8 cm from the plant at a depth of 7-10 cm. Most of the areas with general fertilizer retention can be divided into two and three applications.

In principle, phosphorus and potassium fertilizers are fully applied, and nitrogen fertilizers are generally not higher than 20% and 30% of the total nitrogen rate.

40 kg of fertilizer per mu, applied in ditches or holes, with an application depth of 5-7 cm. Conditionally, organic fertilizer can be added, organic fertilizer is about 10 cm deep, corn plants can be removed 15-20 cm in the ditch, apply organic fertilizer, chemical fertilizer, etc. once, conditional can be combined with "Yanwo microbial agent" 2 billion live bacteria, containing Trichoderma harzianum, so that crops can better absorb nutrients and improve the effect of fertilizer. 40 kg of urea or potassium phosphate (30-5-5) ratio close to about 50 kg of compound fertilizer, with deep application of about 5-10 cm is the best.

Top dressing at the ear stage is generally applied from the corn plant 15 to 20 cm, in strips or holes. Note: Sometimes three ingredients can be added.

If the seedlings are weak at the jointing stage (5-6 leaf stage) after the first fertilization, Yanwo high-nitrogen water-soluble fertilizer should be applied in time, which is fast to dissolve and has high absorption and utilization rate.

When the corn has a small corn cob, you can spray some foliar fertilizer and a small amount of boron fertilizer and potassium fertilizer, which can greatly improve the survival rate of the corn cob, and also promote the growth of the corn cob.

1. Corn fertilization is mainly fertilization at the time and place, but sometimes there will be special situations such as corn seedlings growing too slowly and soil fertility is not enough.

2. When fertilizing, you can't get too close to the roots of the corn, otherwise the roots of the corn will be burned, here is a small method, you can water along the outermost leaves of the corn, so that you can water it thoroughly.

3. Fertilizers like urea and compound fertilizer should be covered with soil after sprinkling, otherwise soil fertility will be weakened.

Let me answer: corn knots on the cob, can you still apply foliar fertilizer in the future? Answer, corn knotted cob, there is no need to hit foliar fertilizer in the future, because corn needs to grow corn cobs after the cob, after the answer is completed, please adopt.

Functions of foliar fertilizer for corn:

Regulate plant height, prevent lodging, promote early maturity, increase and extend corn pollination, prevent empty trees, speed up the corn cob tip grain fullness, prevent bald tips, and comprehensively lengthen the length of the cob ear, etc., It can also greatly increase the weight of 1000 grains, increase production and income by more than 300 catties. And it also solves the disadvantages of shrinking joints and rods of other dwarf products such as arthrothylamine and paclobutrazol.

Precautions for spraying:

Corn foliar fertilizer spraying should generally be carried out 3 5 days before corn tasseling, generally with 2 bottles of Fulvi 655 or Fulvico foliar fertilizer per hectare sprayed on the top leaves of corn.

Some trace element fertilizers such as borax are not easily soluble in cool water and are only easily dissolved when the water temperature is above 40. When preparing the borax solution, it should be dissolved with a small amount of warm water and then diluted to the required concentration with water, so that the fertilizer solution can be uniform.

The spraying time should generally be selected in the morning of a sunny day or after 4 p.m. without wind, or you can choose cloudy weather, so that the longer the solution is moistened on the leaves, the better.

Period when foliar fertilizer needs to be used:

1. When encountering pests and diseases, the use of foliar fertilizer is conducive to improving plant disease resistance;

2. When the soil is acidic, alkaline or salin, which is not conducive to the absorption of nutrients by plants;

3. Full fruit period;

4. After the plant encounters air damage, heat damage or frost damage, choosing the right time to use foliar fertilizer is conducive to alleviating the symptoms.

Spray with water, pay attention to the concentration should not be too large...

You can use special foliar fertilizer for corn, or you can use the concentrated phosphorus and potassium essence of Demer Tianye, the effect is very obvious, you can give it a try.

Generally speaking, the foliar fertilizer spraying time should be selected for corn spraying, and the foliar fertilization should be carried out in relatively humid weather to ensure that the leaves are moist for 30 to 60 minutes. It should be sprayed before 10 a.m. and after 5 p.m., and can be sprayed throughout the day on cloudy days when there is no wind.

Foliar fertilizer should be sprayed on corn in the critical period, and the appropriate part of corn should be sprayed in the flowering and filling period, and it should be sprayed in time when there is a certain defertilization disease. It should be sprayed on corn stems and leaves, and both sides should be sprayed mainly on the front. The spraying strives to be meticulous and even, without missing spraying or respraying.

Corn foliar fertilizer varieties can be used urea, potassium dihydrogen phosphate, superphosphate, potassium sulfate, plant ash leaching solution and some micro fertilizers as foliar fertilization, while chloride-containing ions, volatile and insoluble fertilizers such as ammonium carbonate, ammonium chloride, calcium, magnesium, phosphorus, etc. are not suitable for foliar fertilization.

At this time, foliar fertilization has no effect. Therefore, it should be beaten before pollination to have an effect. So you just need to water it later.

Corn pollination is in the period of returning to the male bud after the loss of Shitong at the big bell mouth, and the pollination has exhausted a large number of camps, and the bottom fertilizer and top dressing have been exhausted. If the corn is pollinated, spray foliar fertilizer to deliver nutrients to the rice, and the corn can get a good harvest.

Useful. The concentration of foliar fertilizer should not be too high, otherwise it will burn the leaves. During the period of raising the sedan chair, regular watering and more sails are blown, and the yellow leaves are pruned off when the reeds are keyed.

Corn foliar fertilizer can be used once every ten to fifteen days.

Corn topdressing is a supplement to meet the nutrient needs of corn growth and development during the growth period of maize, and is a necessary guarantee to achieve high quality and high yield of maize.

The nitrogen absorption of maize was relatively stable, and the absorption rate of nitrogen fertilizer was slowed down at the stage of grain filling maturity, and nitrogen fertilizer was absorbed throughout the growth period.

Phosphorus fertilizer was absorbed during the whole growth period of maize, and it also reached the peak in the most vigorous growth and development of the male tasseling and silking stage, and the phosphorus absorption decreased in the later stage, but it still accounted for about 1 3.

The absorption of potassium in maize was the highest from jointing to booting stage, and reached the highest at flowering stage, and then the absorption of potassium was stopped, but due to the extravasation of potassium into the plant, potassium had a decreasing trend.

Master the best topdressing time, realize scientific fertilization and economic fertilization, and lay a solid foundation for corn production and income.

Seedling fertilizer: generally applied after seedling setting to jointing stage (leaf age index about 30%). That is, the past seedling fertilizer and jointing fertilizer are combined into a single application, which has the effect of promoting roots, strengthening seedlings and promoting leaves and stalks, and laying a good foundation for many ears and large ears.

In addition to the application of available nitrogen fertilizer, seedling fertilizer can also be applied with potassium dihydrogen phosphate in fertile leaves, and can also be applied with well-rotted organic fertilizer.

Jointing fertilizer: Jointing fertilizer can promote the enlargement of middle and upper leaves, increase the photosynthetic area, prolong the photosynthesis of lower leaves, and lay a good foundation for promoting roots, strengthening stalks and increasing ears. Top dressing jointing fertilizer is mainly nitrogen fertilizer, and 10 15 kg urea can be applied in ditches or holes per mu to avoid topdressing before heavy rain to prevent being leached by rain.

For fields with insufficient phosphorus and potassium fertilizer in the soil, three-element compound fertilizer can also be mixed with top dressing, kilograms per mu.

Ear fertilizer: corn topdressing ear fertilizer at the big trumpet stage can not only meet the nutrient needs of ear differentiation, but also improve the photosynthetic productivity of the middle and upper leaves, so that the nutrients transported into the ear are more, the grains are more and full, and the ear fertilizer topdressing is mainly fast-acting nitrogen fertilizer, and 15 20 kg of urea per mu can be topdressed.

Grain fertilizer: Grain fertilizer refers to the fertilizer applied after corn tasseling, which is generally appropriate at the filling stage. After maize is tasseled to maturity, it also absorbs about 40% of the total nitrogen and phosphorus nutrients from the soil.

At the same time, about 80% of the grain yield is made by the later leaves to make photosynthetic yield. Therefore, a certain amount of fast-acting chemical fertilizer should be applied in the later stage to ensure the adequate supply of inorganic nutrients, prolong the functional period of leaves, improve the photosynthetic efficiency, increase the accumulation of photosynthetic products, and promote the number and weight of grains to obtain high quality and high yield.

Corn foliar fertilizer is applied every 7-10 days or so, which is more appropriate.

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In fact, foliar fertilizer can be sprayed every period, but we don't need to spray every period, because spraying too often is not necessarily a good thing for corn, so we must seize the critical period when managing. It is recommended to choose water-soluble fertilizer with soil chef effect for spraying foliar fertilizer, which has the effects of rooting, fruit expansion, color increase, quality improvement, yield increase, and anti-premature aging.

Corn High Yield Technology:

1. Variety and seed quality.

According to the ecological conditions, the excellent varieties with high yield, high quality, adaptability and strong resistance to diseases and insects are selected and promoted by the national or Heilongjiang Provincial Crop Variety Examination and Approval Committee, and the activity accumulated temperature required during the growth period is about 150 less than that of the local perennial activity accumulated temperature.

2. Seed treatment.

Before sowing, the seeds were dried and germination tests were carried out. About half a month before sowing, the seeds are dried for 2-3 days, and they are turned once every 2-3 hours. Germination tests are carried out 25 days before sowing.

3. Fertilization. 1. Organic fertilizer: 30-40 tons of agricultural fertilizer containing more than 8% organic matter are applied per hectare, combined with land preparation and sprinkling or strip application of sandwich fertilizer at one time.

2. Chemical fertilizer: apply an appropriate amount of fertilizer according to the application of corn variety and planting density. It is recommended to apply 135-150 kg of pure nitrogen, 75-90 kg of phosphorus pentoxide, 60 kg of potassium oxide, i.e. 230-250 kg of urea, 160-200 kg of diammonium phosphate and 120 kg of potassium chloride per hectare for plots without soil testing and formula fertilization.

Zinc fertilizer deficient plots are applied with about kilograms of zinc fertilizer per hectare. Among them, 1 3 urea and all diammonium phosphate and potassium chloride are used as seed fertilizer, which are applied with sowing, and the water-soluble fertilizer with soil chef effect is used to do top dressing at the jointing stage of corn.