Is it appropriate to top dressing wheat with urea? Why?

Urea solution is the key to wheat fertilization, because urea solution is a high-efficiency base fertilizer, suitable for fertilization, and compound fertilizer is the key to use as a base fertilizer. Wheat must be fertilized at the seedling stage, wintering stage, rejuvenation stage, jointing stage, booting stage and maturity, and the method and amount of fertilizer used in each link are different.

According to the conventional fertilizer recipe, it is better to use base fertilizer for fertilization, which is also the habit of many farmers. Wheat growth and development should be sufficient light fertilizer, phosphorus and potassium fertilizer should generally be applied at one time in the base fertilizer, and leaf fertilizer should be filled in the middle and late stages to promote growth and development. However, basal fertilizer is different, although it is applied at one time, it will also flow out with watering, and must be applied in batches.

In particular, after the wheat is headed, a lot of basal fertilizer is required to promote the panicle.

Common problems of wheat topdressing: pay attention to the application of more deficient trace elements. Wheat fertilizer must first understand what are the more critical trace elements in the soil layer to limit the increase of production, and only by filling in such elements can other elements give full play to their effects.

Pay attention to the effective interaction of organic fertilizers and fertilizers. Organic fertilizer refers to organic fertilizer with more soil organic matter, and fertilizer has the advantages of high nutrient content and fast fertility.

Pay attention to the effective coordination of basal fertilizer and fertilization. The uptake of nitrogen from germination to regreening accounted for more than 1 3 percent of the total yield, and the uptake of phosphorus and potassium from germination to heading accounted for 1 3 of the total yield. Pay attention to soil type, stubble and light temperature standards.

The coarse sandy soil layer has poor soil fixation and a high probability of nutrient deficiency, so the amount of fertilizer should be increased and fertilized in batches to prevent the outflow of nutrients due to one-time centralized fertilization.

Wheat fertilization time: Some farmers have watered and fertilized the wheat just after it has returned to green, and many farmers habitually use only basal fertilizer to improve the second heading of wheat to improve the efficiency. Although such a thing improves heading, it can usually only improve ineffective tillering, and even if it is spike, it is still a seed in the middle and late stages, and it does not have a great effect on high yield.

And if the number of ears per mu increases, the field is dense and not ventilated, the disease will increase, and the seedlings will be more serious in the middle and late stages, but the yield will be limited.

I don't think it's suitable, because wheat mainly lacks phosphorus and potassium fertilizers in the later stage, and topdressing with urea is of little use.

I don't think it's suitable, because urea's nutrients are too simple to be used for top dressing.

In the process of planting wheat, topdressing with urea is also very good, which can better supplement the nutrients of the soil and help the growth of wheat, but we must pay attention to the appropriate amount.

Now there are two answers, one is to only apply nitrogen fertilizer, such as urea, liquid nitrogen fertilizer, etc., and the other is to use nitrogen-containing phosphorus and potassium ternary compound fertilizer, such as three 15 compound fertilizers, and high-nitrogen compound fertilizers.

There is no right or wrong between these two top dressing methods, but there is a difference in yield, and farmers should use fertilizers that save money, are convenient and have good yields according to the situation.

Time for wheat topdressing

Some farmers have already watered and fertilized the wheat just after it has returned to green, and many farmers are accustomed to using only nitrogen fertilizer for top dressing to increase the second tillering of wheat in order to increase yield.

Although this situation increases tillering, it often only increases ineffective tillering, even if it is spike, it is a seed in the later stage, which does not have a great effect on increasing yield. Moreover, if the number of ears per mu increases, the field is dense and impermeable, pests and diseases will increase, and the lodging will be serious in the later stage, which will reduce the yield.

Top dressing refers to the application of fertilizer to the growth of crops. The role of top dressing is mainly for the large demand for nutrients in a certain period of crops, or to supplement the lack of base fertilizer. The production is usually a combination of base fertilizer, seed fertilizer and top dressing, and generally the base fertilizer is the main top dressing supplement.

Usually top dressing is fast-acting fertilizer, such as: water-soluble fertilizer, etc.

Compound fertilizer is a chemical fertilizer containing a variety of elements, some can be used as base fertilizer, and some can be used as top dressing. But urea only contains nitrogen fertilizer and is generally used as top dressing.

Compound fertilizer is better than urea, which can supplement a variety of nutrients required by crops and balance the nutrients required for crop growth.

Fertilizers for wheat should contain nitrogen, phosphorus, and potassium. It's just that the fertilizer needed is different in different growth periods: basal fertilizer should be added in advance before sowing to ensure the demand for various fertilizers at the seedling stage.

Nitrogen fertilizer is needed after the wheat seedlings return to green, potassium fertilizer is needed for jointing, and a large amount of phosphorus fertilizer is needed at the beginning of booting.

It is mainly urea, and the fertilizer nitrogen required the most during wheat jointing. But the premise is that you have used phosphorus and potassium compound fertilizer as base fertilizer. Otherwise, it will not grow well if it lacks phosphorus and potassium.

Urea is good. Urea is a long-lasting nitrogen fertilizer and is suitable for top dressing. Compound fertilizers are mostly used as base fertilizers.

Yes, we will apply urea every year during the wheat regreening season, which is generally synchronized with the first spring watering. For example, the urea bought this year is 100 yuan a bag, a bag is 100 catties, the total nitrogen fertilizer content is more than 46, about 30 40 catties per mu of land, urea will be sprinkled in the wheat field before watering, and then you can water the wheat field!

Generally speaking, the growth cycle of wheat will go through several development processes such as seedling stage, tillering stage, jointing stage, booting stage, heading period, flowering period, grain filling period and maturity stage, in the natural growth environment, wheat will have a demand for nitrogen fertilizer and phosphate fertilizer in each growth period, and the demand for potassium fertilizer is mainly concentrated in the heading and flowering period, and often the basic absorption of this kind of nutrients in the later stage is very little!

For wheat fertilization, it is mainly concentrated in the sowing period and the wheat rejuvenation stage, among them, we will apply "agricultural sulfur and potassium fertilizer and diammonium phosphate" before sowing winter wheat in autumn, and in the spring of the next year, that is, when the wheat is regreening, urea with the highest nitrogen content will be mainly applied! From spring to summer, there is often no need to apply fertilizer again, and it will be watered two or three times! The picture below shows how fertilization was applied when winter wheat was sown last fall!

In fact, wheat will grow slowly before the regreening period, because it is still in the seedling stage, the individual is relatively small, the demand for nitrogen, phosphorus and potassium is actually very small, but after the regreening period, due to the end of the seedling period at this time, it begins to get up to tiller jointing, booting and heading, which is the development stage of rapid accumulation of wheat dry matter, and the demand for nitrogen, phosphorus and potassium will gradually increase due to the growth of each growth and the acceleration of metabolism. This stage is like the stage when a child grows taller, and often the demand for nutrients will be particularly strong, and after the wheat heading and flowering, the root absorption capacity will be greatly reduced, and the demand for nitrogen, phosphorus and potassium will gradually decrease, so there is basically no need for top dressing in the later stage!

Although I saw some experts on the Internet that there would be many disadvantages of applying urea, at present, in terms of the acceptance of many farmers, the use of nitrogen fertilizer in the wheat regreening period is still very common, and the topdressing method is almost the same, that is, first topdressing and then watering, basically a 3 acres of wheat land can be done within half a day! The above is just a personal opinion!

Top dressing wheat with urea is a more appropriate behavior to make the wheat grow faster and the wheat will be more vigorous.

This is not necessarily, and it should be judged according to the period of growth. Generally speaking, it can be used during the period when the seedlings are growing vigorously, so that the effect will be obvious.

Determine how to fertilize according to the growth of the plant, so that you can judge whether it is suitable or not.

Summary. Urea for wheat topdressing is good.

Is urea good for wheat top dressing?

Urea for wheat topdressing is good.

The effect of urea for wheat topdressing is still very good! Large granular urea** is slightly higher than small granular urea. Small granular urea dissolves and releases slightly faster.

Wheat enters the rapid growth period, and needs to supplement a large amount of nutrients to meet the needs of its growth and development, and top dressing is the most important measure to supplement nutrients. Due to its good instantity, easy absorption, and quick effect, urea is still okay after the spring equinox?

Yes pro. Now it is advisable to chase more catties.

Top application of urea is generally about 10 kilograms per mu. Wheat topdressing urea can be used about 20 catties per mu.

Urea is a white granular crystal that is slightly hygroscopic and completely dissolves in water. After urea application, there is no residue in the soil, which is called a no-by-component fertilizer. Many farmers believe that irrigation immediately after using urea will dissolve in water, but due to the low adhesion of urea, it will seep into the ground and reduce the effectiveness of the fertilizer.

Therefore, it should not be irrigated immediately after chasing urea, and it is even more unscientific to apply urea before rain. Urea has the highest utilization rate, but the operability of agricultural production should be considered. Experts say that the utilization rate of deep burial of soil cover is high, but now the ridges of wheat fields are only a dozen centimeters.

How to bury it? Not operational at all.

Therefore, farmers still mainly use water-soluble fertilizer as the main way, and drip irrigation or other methods are better if the conditions are available. Again, if it is applied in conjunction with organic fertilizer, because there are many microorganisms in organic fertilizer, it can provide better conditions for urea conversion and speed up its transformation process. Wheat topdressing should grasp the characteristics of pre-winter promotion, regreening control and successful panicle after jointing.

At the same time, it should be adapted to local conditions according to different production areas. About.

For the first and second types of wheat fields, watering is not recommended. Postpone fertilization and watering during the jointing period. Apply 10-20 kg of urea per mu.

Poor fertility can get up to water and fertilize, generally apply 10-15 kg of urea per mu, and make up a little during the checkers period, depending on the situation. For three kinds of wheat fields with good fertility, we should pay attention to fertilizer and water management at the jointing stage, and generally apply 25-30 kg of urea per mu and the fertilizer water with poor fertility should pay attention to the fertilizer water at the rising stage.

It is often said that the wheat harvest rained 83 times. Wheat high yield should be watered, get up to pull out water, pick chess water, grout water, watering after the year should master a kind of field can not be watered early, two or three can be watered early, should be watered after 4-5 days of urea. If ammonium carbonate is applied, it can be watered at any time.

Urea is a pure nitrogen fertilizer, which does not contain macronutrients and medium and trace elements necessary for the growth of crops. Urea is the fertilizer with the highest nitrogen content among nitrogen fertilizers and is suitable for a variety of crops. During proper crop fertilization, a lack of fertilizer can lead to a decrease in crop yield and quality.

Even if sufficient fertilizer is applied in the future, the impact on crop yield and pre-quality yield is irreversible. In addition, there is a period of maximum efficiency. During this period, fertilized crops can achieve high yields.

Different crops need fertilizer critical period, and the maximum efficiency period is different. For example, the critical period for wheat to need fertilizer is the tillering stage, the panicle differentiation stage, and the maximum efficiency period for nitrogen fertilizer is the jointing to gestational panicle stage. Therefore, urea should be topdressed during the critical period when the crop needs nitrogen, and the fertilizer should be applied about a week before the maximum efficiency period.

When topdressing urea, the soil should be applied deeply, and the top dressing building should be used before jointing, and then raked flat, and the water should be completely melted and watered after being absorbed by the soil. Foliar spraying, urea has strong diffusion, is easy to be absorbed by the leaves, and has little damage to the leaves. It is suitable for foliar spraying and can be combined with pest and disease control.

When topdressing foliar topdressing, olea with a content of no more than 2% should be selected. Foliar spray of urea is the fastest absorption method for wheat, and can absorb more than 80% 4 hours after spraying. Therefore, the effect is best during the critical period of wheat growth, and the yield increases by more than 15% to 20%.

At present, the most common topdressing method of wheat is to sprinkle imitation pickpocketing fertilizer, manual fertilizer or machine fertilizer, and then water after preparing branches. The efficiency of this forest machine will be relatively high, but if the watering cannot keep up, it will cause the volatilization of nitrogen, so it is recommended to water while spreading fertilizer to improve the utilization rate.

When sprinkling urea, tease slowly, and the soil should be disturbed to sell wet. It is recommended to water after sprinkling urea, and use the method of combining water and fertilizer to improve the utilization rate of fertilizer. This works best with fertilizer.

After sprinkling fertilizer, the soil must have a certain amount of humidity, so it is necessary to water again after sprinkling urea to improve the utilization rate of fertilizer.

Urea is mainly used for wheat topdressing, because urea is a long-acting nitrogen fertilizer, which is suitable for top dressing, while compound fertilizer is mainly used as a base fertilizer. Usually in the bright seedling stage, overwintering, regreening stage, jointing stage, booting stage and Yuheng maturity stage for top dressing, each stage of fertilization method and dosage according to the growth of the application.

Urea is mainly used for wheat topdressing.

Urea is a long-acting nitrogen fertilizer, suitable for top dressing, and compound fertilizer is mostly used as a base fertilizer, generally in the wheat growth stage needs to supplement more nutrients, so it is a good choice to top with an appropriate amount of urea.

When the compound fertilizer is generally leveled before sowing, the ditch is opened according to the predetermined row spacing, and then the fertilizer is sprinkled in the ditch, sown, covered with soil, and suppressed. If the ground is dry, you can sow the seeds first, plow them, and then sprinkle, cover the soil, and suppress them. Generally, compound fertilizer is 150-300 kg.

In recent years, spring wheat producing areas have used a one-time fertilization method, and all fertilizers are used as base fertilizer and seed fertilizer.

Wheat growth is normal, there is basically no seedling weak seedling yellow phenomenon in the field, and the bottom fertilizer application is also sufficient, so after the year, only urea is used for top dressing, and the dosage per mu is about 10-15 kg, which is subject to good wheat growth and high soil fertility. <>

Popular science of wheat

Wheat is the product of the domestication of its wild ancestors by Neolithic humans and has been cultivated for more than 10,000 years. In vast areas of Central Asia, many food residues have been excavated in the settlements of prehistoric primitive societies, including wild and cultivated wheat spikelets, grains, charred wheat grains, ears of wheat and the imprints of wheat grains on hard mud. As early as 7000-6000 BC, wheat was widely cultivated in Turkey, Iran, Palestine, Iraq, Syria, and Israel.

Between the 15th and 17th centuries AD, European colonists spread wheat to North and South America, and in the 18th century, wheat spread to Oceania.