In which month is the jointing stage of wheat? You can enter in the middle and late March.

The jointing stage of wheat is generally about March 20 of each year, that is, it enters the jointing stage when the ground 2cm emerges from the basal internodes of wheat. The growth rate of wheat is faster from jointing stage to pre-heading stage. In order to increase spike yield and seed setting rate, a small amount of available nitrogen fertilizer can be applied according to the growth of wheat.

In which month is the jointing stage of wheat

1. Generally, when planting in the Huang-Huai Plain and North China, around March 20 of each year, around the Spring Equinox, that is, the jointing stage of wheat, when the planted wheat emerges from the ground 2cm at the internodes, it enters the jointing stage, and then the tiller will gradually become ineffective and effective polarization, and the boundaries slowly begin to be clear.

2. From jointing stage to pre-heading stage, the growth rate of wheat is relatively fast, and the organs such as spike, leaf, root and stem advance at the same time, the leaf area and the length of rhizome and ear, and the volume will double or dozens of times, at the same time, it is also a period when dry matter accumulation increases rapidly.

II. Key points of management at jointing stage of wheat

The main results are as follows: 1. the growth and development of wheat is exuberant at the jointing stage, which not only grows leaves and stems, but also begins the differentiation of young spikes, during which sufficient nutrients are needed. In order to increase the number of spikes and seed setting rate, a small amount of available nitrogen fertilizer can be applied at jointing stage.

2. The suitable amount and time of fertilization at jointing stage can be determined according to seedling condition and soil condition. It is necessary to prevent wheat from getting rid of fertilizer and early senescence, resulting in a small number of grains per spike and reducing yield, as well as to avoid excessive fertilizer and lodging and reduce wheat yield.

3. In general, the leaves of high-yield wheat will appear dim color at the jointing stage, which is a normal phenomenon, which reflects the transformation of wheat from vegetative growth to reproductive growth, so the middle leaves will not flourish. At this stage, when the first Internode of the base is elongated to fixed length, it is very suitable to apply a small amount of available nitrogen fertilizer, which is beneficial to promote the growth and development of wheat.

III. Application principles of jointing fertilizer for wheat

The main results are as follows: 1. For the wheat fields with yellow seedlings and dead seedlings, the wheat fields can be watered and protected in time after the soil is thawed, and nitrogen fertilizer can be applied in different times.

2. When the wheat turns green, 10-14 jin of urea should be applied first, so as to promote the early development of seedlings, and then apply appropriate amount of nitrogen fertilizer according to the situation of seedlings at the jointing stage, which is suitable for wheat fields where urea is applied twice. There are irrigated wheat fields where the total number of seedlings per mu is less than 450000 before turning green, and 20-30 jin of urea can be applied in conjunction with watering at the second jointing stage after spring.

3. In the irrigated wheat field with a total seedling number of 45-600000 per mu before turning green, combined with 20-28 jin urea per mu in the starting stage, and in the wheat field where the total number of seedlings per mu has reached 60-800000 before turning green, it is necessary to apply nitrogen fertilizer and move backwards. When the wheat seedlings basically fade at the jointing stage, water and topdressing fertilizer will be carried out, and 24-30 jin urea per mu will be applied.

4. In arid wheat fields, it is necessary to combine suppression and hoeing to preserve soil moisture and increase soil moisture, so as to strengthen the drought resistance of wheat itself. when the soil returns to slurry or rainfall in early spring, 10-14 jin urea can be opened or fertilized with chemical fertilizer.