When is the wheat topdressing urea?

Urea can be applied to wheat in spring, and the period of wheat returning to green is about 30 days. Wheat topdressing urea method: urea can be sprayed outside the wheat root, the concentration is 2%, usually 2 jin of urea to 100 jin of water, can be sprayed 1 mu of wheat field, once every 8-10 days, a total of about 3-4 times. Wheat topdressing urea taboos: can not be mixed with ammonia water, plant ash, ammonium bicarbonate and other alkaline fertilizers.

1. Wheat is suitable for topdressing urea.

The main results are as follows: 1. Urea can be applied in spring wheat turning green period, which means that more than half of the heart leaves of wheat seedlings in the early spring wheat field, when the growth part reaches 1-2cm, is called "turning green". From the beginning of wheat turning green to before getting up, it lasts about 30 days, which belongs to the last period of seedling stage, and is called wheat turning green stage.

2. The development of wheat in this period is mainly rooting, long leaves and tillering, and the green stage of wheat is also an important period to promote the growth of late weak seedlings, control the growth of prosperous seedlings, adjust the size of seedlings and determine the spike rate.

3. In the period of returning to green, topdressing can be carried out according to the seedling stage. For 2-3 kinds of seedlings with poor growth before winter, as well as wheat seedlings with poor soil quality and early sowing, urea should be applied early or re-applied.

4. Urea can be applied to soil moisture at the beginning of thawing on the ground, which plays a very important role in promoting the growth of wheat seedlings and increasing the number of wheat spikes, but there is no need to apply urea in the first class seedlings with more wheat seedlings, or in the wheat fields where there is a large number of wheat seedlings, but the topdressing application can be postponed until the time of getting up to control invalid tillers, so as to improve the spike rate of wheat tillers and increase the number of wheat spikes.

2. the method of topdressing urea to wheat.

1. To master the dosage, the suitable dosage per mu is 16-24 jin.

2, to apply evenly, if uneven will lead to wheat seedling burning, but also a waste of urea.

3. Try to cover the soil deeply, and the suitable depth is 10-15cm.

4. In order to apply urea in advance, topdressing in spring should be 5-8 days earlier than other nitrogen fertilizers.

5. It can be combined with phosphorus and potassium fertilizer in order to meet the nutrient demand of wheat.

6. Topdressing outside the root, spraying urea outside the root of wheat, the suitable concentration is 2%, generally 100 jin of water to 2 jin of urea, can be sprayed on 1 mu of wheat field, a total of 3-4 times, with an interval of 8-10 days.

2. Taboos of topdressing urea on wheat

The main results are as follows: 1. When topdressing wheat with urea during the turning green period, it should not be mixed with alkaline fertilizers such as ammonia water, plant ash, ammonium bicarbonate and so on.

2. Do not apply to the ground. Urea dissolves easily in water. If the ground is not covered with soil, nutrients will be dissolved in Rain Water and lost, and it will also stick to the leaves, resulting in wheat burns.

3. Heavy water irrigation can not be carried out after urea application. Urea is dissolved in water in the state of molecules in the soil. Although it can be absorbed and stored by the soil, heavy water irrigation or series irrigation after urea application will cause the loss of urea fertilizer effect, so it is better to adjust it with fine water.