When is the best pesticide to be added to corn seedlings

Corn topdressing should be based on soil fertility, variety fertilizer characteristics, variety growth period and other appropriate amount of topdressing to meet the needs of corn growth and development. However, the previous time to chase less, the latter to chase more, whether to chase the grain fertilizer should be based on the soil fertility status. In the later stage, the soil that is easy to defertilize can chase a little less tapping fertilizer, so as not to cause too much topdressing to cause greedy green and late ripening and reduce yield.

When is it good to top dressing corn ? Which fertilizers should I use? Reasonably determine the topdressing time.

If topdressing three times, the seedling stage should not be topdressing too early, 5-6 leaves are appropriate, in order to facilitate squatting seedlings thick and strong; Jointing fertilizer is generally suitable for 10-11 leaves, and mechanical operations can be appropriately advanced and avoided. Do deep fertilization. Corn topdressing must be applied deeply, otherwise it will reduce fertilizer utilization.

The most suitable depth is 5-10 cm, and the soil is covered in time. Look at the growth of top dressing. In the plot where the seedlings are not even, the strong seedlings and weak seedlings should be treated differently when topdressing, and the weak seedlings should be appropriately early topdressing, and foliar fertilizer can be sprayed separately if necessary to promote the early growth of weak seedlings; The topdressing time of strong seedlings should be appropriately delayed.

Apply potassium fertilizer in moderation. In the case of insufficient potassium application in the base fertilizer, an appropriate amount of potassium fertilizer can be applied to make up for the lack of potassium.

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Corn special fertilizer is a fertilizer that is prepared according to the needs of corn growth, which is better.

Technical points of corn skillful top dressing:

1. The time for corn topdressing.

The trumpet stage (about 10-12 leaves) is the best period for top dressing of corn, because the reproductive growth and vegetative growth of corn at this time are relatively vigorous, and the amount of fertilizer required is larger than that of Liang. At this time, top dressing can effectively promote ear differentiation, make corn ears large and more grains, and the yield increase effect is very obvious.

Generally speaking, corn topdressing has the best effect of topdressing twice, the first time in the jointing and booting stage (accounting for two-thirds of the total topdressing), the second topdressing of panicle fertilizer (accounting for one-third of the total topdressing), and the first topdressing can be started when about 10 leaves. If time does not allow, a one-time topdressing can also be carried out in early July, but it is not necessary to do so. Rent slag.

2. Fertilizer selection for corn top dressing.

If the corn leaves have signs of zinc deficiency, potassium deficiency and other deficiencies, you can choose to apply the soil chef polymerized potassium dihydrogen phosphate to supplement phosphorus and potassium elements, and the soil chef contains trace elements of water-soluble fertilizer.

If the corn is not deficient, urea can be applied, and the amount of topdressing can be determined according to the soil fertility, generally 30 40 kg of urea per mu, which can meet the needs of corn growth in the later stage.

3. The method of topdressing jade code rice.

In order to save trouble, many growers directly sprinkle fertilizer with top dressing, but usually the top dressing effect is not ideal. It is recommended that you take artificial pit covering soil topdressing, and the fertilization distance is generally 10 cm away from the root of the plant, and the depth of the pit is 10 cm.

4. Precautions for corn topdressing.

When topdressing, the planting density is more than that, and the density is smaller. In addition, sandy soil has poor water and fertilizer retention, so it should be applied in small amounts and in large quantities to prevent fertilizer loss.

When topdressing, it is necessary to look at the ground, see the seedlings and top dressing, low-lying land and alkaline land, to choose ammonium nitrate, ammonium sulfate, superphosphate and other acidic or physiological acidic fertilizers for top dressing. For sandy loam soil with poor water and fertilizer retention capacity, ammonium nitrate or urea that is not easy to volatilize should be used as top dressing.

Top dressing at the seedling stage can not be too early, and top dressing before jointing often leads to corn growth and weak roots. In addition, excessive topdressing during the grain filling period will lead to late maturation.

It is best to look at the weather forecast before topdressing, it is best to topdress before rain in the case of soil dryness, and after corn topdressing, you should also flexibly grasp whether you need to water according to the dry and wet conditions of the soil.

Soil testing is carried out to determine the soil fertility grade, and then the number of top dressing and the amount of fertilizer used. Observe the growth of corn before topdressing, and if there are signs of defertilization, the number and amount of topdressing can be appropriately increased.

The special fertilizer is matched according to the needs of corn, so it is better to chase corn special fertilizer in the later stage of corn.

Summary. 1) Top dressing at the seedling stage of corn is generally suitable for nitrogen fertilizer, phosphate fertilizer and potassium fertilizer, and in principle, all phosphorus fertilizer and potassium fertilizer should be applied into it, and the amount of nitrogen fertilizer depends on the soil, seedling condition and other factors.

2) If it is a high-yield field, the application rate of nitrogen fertilizer should generally not be higher than 20-30% of the total fertilizer application rate; In the middle-yield field, the nitrogen fertilizer application rate was 50-60% of the total fertilizer application; In low-yield fields, the nitrogen fertilizer application rate is more than 60% of the total fertilizer application rate.

What fertilizer is good for top dressing at the seedling stage of corn.

1) In the corn seedling stage, top dressing is a rotten imitation of nitrogen fertilizer, phosphate fertilizer, potassium fertilizer is appropriate, and the original hunger should be applied to all phosphate fertilizer and potassium fertilizer, and the amount of nitrogen fertilizer depends on the soil, seedling condition and other factors. 2) If it is a high-yield field, the application rate of nitrogen fertilizer should generally not be higher than 20-30% of the total fertilizer application rate; In the middle-yield field, the nitrogen fertilizer application rate was 50-60% of the total fertilizer application; In low-yield fields, the nitrogen fertilizer application rate is more than 60% of the total fertilizer application rate.

The topdressing time generally depends on factors such as seedling condition, leaf color, and basal fertilizer application. The three types of seedlings and transplanted seedlings with narrow and long leaves, yellowish leaf color, insufficient nutrition and weak plants need to be topdressed as soon as possible, and the amount of fertilizer should be increased appropriately. Interplanted corn seedlings are usually weak, lean and yellow, and need to be applied immediately after wheat harvest.

The three types of seedlings should be fertilized first and then the seedlings should be fertilized, and they should be irrigated in time according to the moisture to give full play to the effect of fertilizer disturbance and blocking the base.

Generally, the method of furrow application or hole application can be used for top dressing, the fertilization depth depends on the plant height, in order to prevent the ditch soil from being buried and attacked Wang Miao, under normal circumstances, the application depth of chemical Zen crack fertilizer needs to be greater than 5 cm, the application depth of organic fertilizer is about 10 cm, and the fertilization can be 10-15 cm away from the plant Nucleus ditch, and then the organic fertilizer and chemical fertilizer are applied at one time, and finally covered with soil to enhance the fertilizer effect.

The topdressing time is relatively late, and it is not until the time when the corn is eared before topdressing. Under normal circumstances, corn does not pick fertilizer, as long as all the fertilizer is wet at one time, it is best to eat some fertilizer such as cow dung and pig manure to increase yield.

Corn is best dressed in June, and topdressing during this period will make the corn grow better. But be sure to use farmhouse manure to fertilize, which will increase yields, and many families do this.

You can go to the farmer's market to buy fertilizer specifically for corn, and you can use cow manure or pig manure to fertilize corn, which can increase the yield of corn.

During the growth of corn, it is necessary to top dressing several times, and the last topdressing time should be before the corn female filaments begin to be pulled out for pollination. At this time, phosphorus and potassium fertilizers should be the mainstay. Reasonable fertilization at this stage can not only promote the differentiation of female ears, but also improve the photosynthesis of maize, which is more conducive to the growth of maize.

When fertilizing corn, it should be noted that no matter when the fertilizer is topdressed, the fertilizer should not be spread on the surface. It is best to choose furrow application or hole application, and reasonable watering after fertilization is more conducive to the growth of corn. Potash and phosphate fertilizers should be used.

Among them, potassium fertilizer affects the 1000-grain weight of crops, and if potassium fertilizer is insufficient, corn grains will turn white and the 1000-grain weight will be low. Phosphate fertilizers affect the ripening of crops. When the phosphorus fertilizer is insufficient, the ears of corn are loose.

But more is not always better. Excess phosphate fertilizer will reduce yields.

<>1. Fertilizer selection: The bottom fertilizer is generally a mixture of high-quality farm fertilizer, an appropriate amount of nitrogen fertilizer, and all phosphorus, potassium fertilizer and micro fertilizer into the soil, while top dressing is mainly nitrogen fertilizer. 2. Fertilization method:

Under normal circumstances, 2000-3000kg of high-quality farm fertilizer, one-third of nitrogen fertilizer, and all phosphorus and potassium fertilizers should be applied per mu, and the depth of fertilizer application should be 10-15cm.

1. What chemical fertilizer is used to plant corn bottom fertilizer?

1. Base fertilizer (base fertilizer).

1) The base fertilizer is generally mixed with farmhouse fertilizer, an appropriate amount of nitrogen fertilizer, and all phosphorus, potassium fertilizer and micro fertilizer into the soil, and nitrogen fertilizer is generally used for top dressing.

2) When applying base fertilizer, it is advisable to use high-quality farmhouse fertilizer. Under normal circumstances, 2000-3000kg of high-quality farm fertilizer, one-third of nitrogen fertilizer, and all phosphorus and potassium fertilizers are applied per mu. The depth of fertilizer application should be about 10-15cm.

2. Seed fertilizer. 1) At the time of sowing, apply 3-5kg of compound fertilizer per mu as seed fertilizer.

2) When fertilizing, a certain distance should be kept between the fertilizer and the seeds, and the fertilization depth should be about 10-15cm.

3. Top dressing. 1) Jointing fertilizer: 40% of the remaining nitrogen fertilizer is used as jointing fertilizer, which can promote the growth of stems and the differentiation of young panicles, and the distance between fertilizer and seedlings is kept at about 5-7cm when fertilizing.

2) Spike fertilizer: Using the remaining 60% of nitrogen fertilizer as panicle fertilizer can promote the increase and abundance of grains per panicle, and at the same time is conducive to grain filling in the later stage.

3) Flower grain fertilizer: If it is a high-yield plot, an additional 10-15kg of urea can be applied on the side of the corn row per mu.

Second, when to apply corn bottom fertilizer

1. Bottom fertilizer application time.

Bottom fertilizer is generally applied before sowing. If the basal fertilizer is sufficient, it can be applied to the soil in combination with tilling the soil before sowing. If the basal fertilizer is insufficient, it is advisable to apply it in a concentrated strip or hole.

2. Top dressing application time.

1) Seed fertilizer is generally applied at the time of sowing.

2) Jointing fertilizer is generally applied about 10 days after jointing (corn flakes and leaves).

3) Ear fertilizer is generally applied about 10-15 days before corn tasseling (10-12 leaves of corn).

4) Flower fertilizer is generally applied before and after the female spike is silked.

Mainly because corn is a high-yield crop and requires a large amount of fertilizer, it must be reasonably fertilized to meet the nutrient needs of corn in the whole growth period. In the three stages of maize growth, the proportion of fertilizer required is different, the seedling stage accounts for 2 of the total fertilizer requirement, the ear stage accounts for 85, and the grain stage accounts for 13. Corn from jointing to the mouth of the big cough bell stage, is the peak period of fertilizer, fertilization to achieve reasonable fertilization, that is, the combination of base fertilizer, seed fertilizer, top dressing; combination of nitrogen, phosphate and potassium fertilizers; The combination of agricultural fertilizer, chemical fertilizer, and biological bacteria is wide slag fertilizer.

Bottom fertilizer should be applied sufficiently, which is the foundation, generally 2000 kg of rotted organic fertilizer, phosphorus pentoxide kilograms, potassium fertilizer kilograms as base fertilizer. In the plot where the level of base fertilizer and seed fertilizer application is not high, the soil fertility conditions are poor, and the late-maturing varieties are planted, top dressing can be carried out at the 6 7 leaf stage of Qiaoshou corn, and about 15 kg of urea per mu is chased and more than 15 cm is chased deeply, so as to improve the utilization rate of chemical fertilizer; Bottom fertilizer and seed fertilizer are applied to the plots with high levels, and about 10 kg of urea per mu. Corn topdressing should be carried out as soon as possible, the first method is the front topdressing, the back of the ground, topdressing and the land should be combined; the second is to use a pickaxe to dig the pit and chase more than 15 centimeters deep; When topdressing, it is necessary to combine chemical fertilizer and biological fertilizer to promote the good development of the root system, under normal circumstances, 10 15 kg of urea per mu, plus 1 kg of biological fertilizer, can promote the early maturity of corn.

In the heading stage and filling stage, the mu is sprayed with kilograms of potassium dihydrogen phosphate and kilograms of urea, mixed with 50 kilograms of water, which can prevent baldness and grain deficiency, increase yield and improve quality. Organic food corn, can not use chemical fertilizer is best to use fermented organic fertilizer, do base fertilizer, top dressing with cake fertilizer, fertilizer effect is stable and lasting, the effect is better than chemical fertilizer, and the stamina is long, but when topdressing, cake fertilizer and crop seedlings keep a proper distance, so as not to burn the seedlings caused by the heat generated during the fermentation of cake fertilizer. These are all very important.

<> in the late stage of corn growth, it is necessary to apply seedling pulling fertilizer and fruit promoting fertilizer, seedling pulling fertilizer is generally based on urea and mixed with compound fertilizer about 30kg, and fruit promoting fertilizer is carried out when corn grows small corn cob, usually foliar spraying boron fertilizer and potassium fertilizer. It should be noted that the amount of base fertilizer and top dressing needs to be reasonably arranged when fertilizing, so as to avoid the situation that the amount of base fertilizer is large and the amount of top dressing is small, which is easy to lead to the phenomenon of early growth and early aging of the plant.

1. What fertilizer is needed in the later stage of corn?

1. Fertilizer needed.

1) Seedling fertilizer: Seedling fertilizer is usually urea-based, and mixed with compound fertilizer about 30kg. Applying seedling fertilizer can speed up the growth rate of plants, promote early flowering and fruiting, and improve growth efficiency.

2) Fruit-promoting fertilizer: When the plant sets ears and small corn cobs appear, boron fertilizer and potassium fertilizer can be sprayed on the foliar surface, which has the effect of promoting the growth and expansion of corn cobs.

2. Fertilization methods and precautions.

1) Fertilization method: Before fertilization, dig a pit at 5-8cm away from the roots of the plant, and then fertilize the soil and water it, so that the fertilizer can fully contact the soil and help the roots absorb nutrients.

2) Precautions: Because the growth period of corn is relatively long, it is necessary to avoid the situation that the amount of base fertilizer is large and the amount of top dressing is small, which is easy to cause plant growth in the early stage and premature aging in the later stage.

2. When does corn need the most fertilizer

1. The period when the amount of fertilizer is the largest.

The jointing stage is generally the period when the corn fertilizer needs the most, and the reasonable topdressing at the stage from the jointing to the big bell stage can effectively improve the yield and quality of corn.

2. How to fertilize.

1) Jointing period.

Usually it can be applied in the hole when the corn is 7-9 leaves, and the ordinary corn plot can usually be top-applied with urea 7-15kg mu.

For plots with insufficient phosphorus and potassium fertilizer, 7-10kg of nitrogen, phosphorus and potassium compound fertilizer can usually be applied.

2) Big flare period.

In the large flare stage, the top application of fruit ear fertilizer can be applied with high-efficiency urea, or high-nitrogen and low-phosphorus compound fertilizer per mu.

In the plot with sufficient base fertilizer and high fertility, 15-17kg of fertilizer can be applied in general; Ordinary plots can be topdressed 18-20kg; For plots with insufficient base fertilizer and poor fertility, 22-25kg can usually be topdressed.