How much is the best maximum amount of urea sprayed for wheat? Is there anything to look out for?

Wheat is the main food crop in our daily life, and the quality of his growth and variety characteristics, growth environment and planting technology and other aspects are inextricably linked, if the cultivation technology is not properly applied, then the same plot of wheat produced will be very different, crops a flower, all rely on fertilizer, wheat quality and high yield, is inseparable from fertilizer application.

Urea application to plant high-quality strong gluten wheat, we should follow the fertilization principle is, "stable nitrogen and phosphorus with potassium thickening and micro" this cross principle, when we plant wheat, different plots, its own fertility is also different, for its own fertility is relatively high plots, the ratio of base fertilizer and top dressing is basically 7:3. For plots with high fertility, the ratio of basal fertilizer to top dressing can be 5:

5。Specifically, it is necessary not only to apply urea, but also to cooperate with the use of other fertilizers. On the basis of promoting straw returning to the field to increase the mechanism of soil, we should apply foot fertilizer, apply 3000 5000 kg of organic fertilizer per mu, pay attention to the application of urea, 30 kg per mu is enough. In the process of fertilization, attention should be paid to layered fertilization, nitrogen fertilizer, potassium fertilizer, zinc fertilizer buried at the bottom, phosphate fertilizer sprinkled on the head of the wall, in which phosphate fertilizer and potassium fertilizer can not be mixed.

Through the previous experience of wheat planting, the effect of using basal fertilizer and top dressing at the same time is better than only applying basal fertilizer, and the effect of nitrogen fertilizer backward is much better than that of early fertilization, so we need to change the past measures of top dressing at the regreening stage, and reapply top dressing at the jointing stage until the booting stage. Generally, it is necessary to apply fertilizer according to the fertility of the land, apply 10 15 kg of urea per acre, and remember to water immediately.

This period is the period when wheat needs the most fertilizer and water in the whole growth process, and it is also the period when it is most sensitive to fertilizer and water. At this time, fertilization and watering can not only improve the yield of wheat, but also increase the protein content in it, and at the same time can also promote the thickening of the first internode, thereby improving the lodging resistance of the plant, so the effect of applying urea at this time is very significant.

During the critical period of control, the precipitation before irrigation into winter or the soil moisture content is high, which will inhibit the formation of wheat protein, so if the soil is not too dry before winter, there is generally no need to water overwintering water. But this also depends on the specific situation, if the water content in the soil is too low, then it should be properly watered overwintering water, so as to ensure the safety of wheat seedlings through the winter, after watering the winter water in the green period generally does not need to be watered again, jointing period to gestation period is the peak period of wheat fertilizer and water demand, which has an extremely important role in improving the protein content of wheat, so fertilizer and water should be used together during this period.

The right amount at the right time. Each use should not exceed kilograms per 667 square meters. Excessive amount will not only increase the cost of planting, but also induce root burning, vigorous growth and late maturity.

About 40 pounds is fine. It is best to use fertilizer without rain when the weather is fine, otherwise it will reduce the efficiency of the fertilizer. It should be noted that the method of fertilization must be correct and not too dense, otherwise it will cause seedling burning.

Urea is the highest content of nitrogen fertilizer fertilizer, and can also be widely used in a variety of soils and crops, how to use urea correctly in the process of wheat planting, in order to be economical, efficient, and increase the yield, let's talk to you about the correct use of urea in wheat urea should be used with nitrogen, phosphorus and potassium, avoid the use of too much nitrogen fertilizer, the amount of urea in the planting process should be used according to the target yield and soil fertility, can not be used at will, insufficient urea use or excessive use will affect the yield.

Wheat is one of the three major food crops in China, especially in the north, wheat flour is the main food**. Therefore, the planting area of wheat in China is very large, second only to the European Community in the world's wheat planting area. Urea is a high-efficiency, stable, high-nitrogen fertilizer that can be used for bottom and top dressing, especially for wheat.

Wheat spraying concentration is generally 1%. Each acre of land needs about one sprayer, the sprayer generally holds 15 kilograms (kilograms) of water, and 150 grams of urea is required, that is, 150 grams of urea per mu is appropriate.

Wheat is generally watered with water after the green urea per mu dosage in 30-50 catties, in special circumstances can be sprayed with urea aqueous solution, special circumstances refer to wheat in the watering of urea 7-10 days seedling condition is not good before spraying, otherwise do not use foliar spray urea.

Urea is a large number of elements, nitrogen content of 46%, generally used for top dressing, can also be low application, if foliar spraying is recommended a bucket of water 30 kg dosage does not exceed 200 grams is appropriate, because urea contains biuret components, when the dosage is large, it will burn leaves, especially when the temperature is high, the burning of leaves will be more serious. Therefore, it is better to spray urea to avoid high temperature at noon, and it is better to spray after 17 o'clock in the afternoon. It is also not advisable to use too small amount, at least 100 grams per bucket of water, less effect is not good.

The time points of urea spraying in wheat were mainly concentrated after the jointing stage, flowering stage and grain filling stage. At the seedling stage, an appropriate amount of wheat can be added according to the growth of wheat. Because the length of wheat plants is relatively high at these two stages, artificial fertilization is more difficult, so it can be greatly helpful to improve the quality and yield of wheat by spraying "one spray and three preventions" or spraying urea aqueous solution alone.

Wheat spraying urea, which is obviously directly acting on the wheat stems and leaves to the root out of the soil as the boundary of the plant, so to do a good job of distinguishing, the urea applied by basal fertilizer, acting on the growth and germination of wheat; During the growth period, the urea of top dressing first acts on the wheat roots, and after being absorbed by the roots, it is transferred to the whole wheat plant for growth, and the foliar fertilizer is sprayed on the stems and leaves.

The urea spray concentration is 1%. In the early and middle stages of crop growth, the concentration of urea sprayed is, and the concentration of spraying at seedling stage is. If it is a gramineous crop such as rice and wheat, urea spraying concentrations can be used.

However, when spraying foliar sprays, the concentration of urea solution should not be too large, otherwise it will burn the leaves and poison the plants. Generally, the concentration of spraying wheat and corn is 2%, and the concentration of vegetables and melons is 0 5 %-1.

5% is appropriate.

Nitrogen, phosphorus and potassium. Fertilizer is one of the three nutrients necessary for the normal growth and development of wheat. Only a combination of nutrients can promote each other, and the application of any one of these nutrients alone will not achieve the effect of increasing yield. Nitrogen fertilizer is used to increase the growth and tillering of roots, stems and leaves at the seedling stage, especially at the jointing stage.

plays an important role. Urea.

Suitable for a wide range of soils and crops. It can be used as base fertilizer and top dressing, but generally not as seed fertilizer.

When dryland is used as basal fertilizer, 20 kg per mu is applied in furrows or strips, and when paddy fields are used as basal fertilizer, 15-20 kg per mu is applied 5-7 days before irrigation and ploughed into the soil. In dryland top dressing, 10 kg per mu is applied into a trench or hole 7-10 cm deep. When topdressing with urine in paddy fields, drainage should be done first, and then about 8 kg of urea per mu should be applied to the topsoil before irrigation.

When urea is used as top dressing, it is usually applied 3-5 days earlier than other nitrogen fertilizers. Urea can also be used as an out-of-root top dressing, and the spray concentration varies from crop to crop. Generally, about 1% of field crops are commonly used, and the growth is not good or the seedling stage can be appropriately reduced.

The concentration of open-field vegetables is lower than that of field crops, and the concentration of fruit trees and greenhouse vegetables is even lower. Then, the concentration of urea sprayed on wheat is 1%-2%, which is generally sprayed from flowering to early filling, and the concentration should be appropriately reduced when the growth is weak or the wheat seedling stage is sprayed.

When wheat is sprayed with urea, the dosage per mu is generally 50-75 kg, and it is sprayed once every 7-10 days, a total of 2-3 sprays. Then, it can be calculated that 1-2 kg of urea and 100 kg of water per mu of wheat should be sprayed. Foliar application of urea solution to wheat can only be applied in malnourished plants.

When used, it can only be used as a supplement, and has the effect of increasing grain weight. Generally, nitrogen fertilizers such as urea solution are sprayed in wheat fields, and the yield increase effect is better.

In high-yielding fields, phosphorus spraying can increase grain weight, such as spraying 24% superphosphate.

solution or potassium monobasic phosphate.

Solution. Nitrogen, phosphorus and potassium fertilizers are the three nutrients necessary for the normal growth and development of wheat. Only a combination of nutrients can promote each other, and the application of any one of these nutrients alone will not achieve the effect of increasing yield.

Nitrogen fertilizer plays an important role in the growth and tillering of roots, stems and leaves at the seedling stage, especially at the jointing stage. Urea is suitable for a wide range of soils and crops. It can be used as base fertilizer and top dressing, but generally not as seed fertilizer.

The dosage of one acre of land is kept at about 80 90 catties, so as to achieve the best fertilization effect, spraying pesticides to sell better, it is necessary to pay attention to the correct spraying method in this process, the concentration of urea should be appropriate, and try to choose to spray after the rain.

I think it is best to use about 20 catties of urea per acre, and pay attention to spraying when there is no wind, otherwise it is easy to cause waste.

I think it's enough to use 50 kg of 3000 times urea solution, and you should pay attention to the weather forecast before spraying, otherwise the rain effect will not be good after spraying.

Urea is also applied differently in wheat fields with different fertility.

1) High fertility wheat field: apply 5-7kg of pure nitrogen (equivalent to about 13kg of urea or about 35kg of ammonium carbonate) and 50% (15-18-17 or 18-19-13) 35-45kg mu at the bottom of each mu.

2) Medium fertility wheat field: apply 5-7kg of pure nitrogen (equivalent to about 15kg of urea or about 40kg of ammonium carbonate) at the bottom of each mu, and 30-40kg of total nitrogen, phosphorus, potassium and zinc content of wheat formula fertilizer can also be used (15-18-17 or 18-19-13).

3) Low fertility wheat field: apply pure fluorine 5-7kq (equivalent to about 10kg of urea or about 26kq of ammonium carbonate) and 54% (18-22-14) 30-40kg per mu.

4) Fertilization method: nitrogen fertilizer in high-yield plots, with 60% of the total amount as base fertilizer, 40% as top dressing; For medium and low-yield plots, 50% of the total amount is used as base fertilizer, 10% is used as seed fertilizer, and 40% is used as top dressing.

Extended Information: 1).The use technology of winter wheat fertilizer is generally believed to absorb about 100 kg of pure nitrogen and 1-phosphorus for every 100 kg of wheat grains

kilograms, potassium 2-4 kilograms, the ratio of nitrogen, phosphorus, potassium is about: 1. Among them, nitrogen and phosphorus were mainly concentrated in the seeds, accounting for 76% of the total content of the whole plant, respectively, and potassium was mainly concentrated in the stems and leaves, which was the total content of the whole plant.

2) There should be enough fluoride and an appropriate amount of phosphorus and potassium nutrients in wheat seedlings. According to the growth law and nutritional characteristics of wheat, basal fertilizer should be reapplied and top dressing should be applied early. The amount of basal fertilizer should generally account for 60% 80% of the total fertilizer amount, and top dressing should account for 40% and 20%.

3) According to the Institute of Soil and Fertilizer of Qinghai Academy of Agriculture and Forestry Sciences, the data of 7500 kg of spring wheat yield in the province are comprehensive, and about 100 kg of nitrogen, phosphorus and potassium are required for each 100 kg of grains. The ratio of nitrogen, phosphorus and potassium is. There are two peak periods for the uptake of nitrogen, Bo and potassium in spring wheat

The first is jointing to booting, and the second is flowering to milkiness, and the former is slightly higher than the latter. The phosphorus absorption rate has been increasing from emergence to milk maturity, from the sharp increase in jointing to the highest value of milk maturity. According to the growth law and nutritional characteristics of spring wheat, basal fertilizer should be reapplied and top dressing should be applied early.

4) 30-60 tons of farmyard fertilizer, 375-600 kg of ammonium bicarbonate and 450-600 kg of superphosphate per hectare of base fertilizer.

5) Seed fertilizer, generally 150 kg of ammonium bicarbonate and 225-375 kg of superphosphate per hectare, mixed with 1500 kg of high-quality farm fertilizer, or 150-300 kg of binary nitrogen and phosphorus compound fertilizer. When sowing, combined with a small amount of seed fertilizer, 75-120 kg of diammonium phosphate per hectare, and no top dressing will be applied in the future. This method is suitable for drylands.

Almost 10 or 20 pounds or so is the most suitable. Be sure to ensure the normal growth of wheat and do not water too much urea.

Generally, three bags of urea can be used for one acre, otherwise it will lead to excessive nutrients, which is not good for wheat.

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!

<> most farmers in wheat topdressing mainly use urea, is it good? Relatively speaking, urea topdressing is better. Because urea is a nitrogen fertilizer, it works quickly, and other fertilizers are insoluble.

P-containing compound fertilizer, compound fertilizer or organic compound fertilizer should not be used for top dressing. Most P fertilizer varieties and organic compound fertilizers are insoluble in water, and basically do not melt after sprinkling, and do not have a good top dressing effect. At the same time, the nitrogen content of compound fertilizer is often insufficient.

Nitrogen fertilizer is needed for wheat growth, and urea is better for wheat topdressing. For plots lacking K, Nk compound fertilizer can be used as top dressing, but the top dressing amount is mainly N content.

The vegetative growth stages of winter wheat include emergence, tillering, overwintering and jointing. The long reproductive stages include booting, heading, flowering, padding, and maturation. The yield of spring wheat is low, and the growth period is interrupted, only 100-200 days. From seedling emergence to jointing, the main goal of fertilization is to strengthen root growth, sin distribution and organic matter synthesis. From jointing to pillowing.

Fertilization is to promote stem and leaf growth, effective tillering and panicle size; From heading to maturity, the main focus was to increase the number of powder, grain weight and protein content. The rate of nutrient uptake increased after winter wheat returned to green. From jointing to heading is the fastest time to absorb and accumulate dry matter; The peak of nitrogen uptake is from jointing to booting, and the nutrient uptake rate gradually decreases after flowering.

Winter wheat is an overwintering crop, and the seedling stage is the critical period of phosphorus nutrition. It is especially important to apply sufficient phosphate fertilizer to the base fertilizer. Because of the weak root system at the seedling stage, the soil phosphorus supply and crop absorption capacity are greatly reduced in drought and severe cold.

It affects the regreening and tillering of wheat seedlings, and it is difficult to remedy it by topdressing phosphorus fertilizer.