Technical points of winter wheat management

First, the reform of the jointing period

After the winter, the wheat has entered the stage of rejuvenation, getting up, and jointing. Photosynthetic products are used for the growth and development of vegetative and reproductive organs, and the growth is gradually accelerated. It needs to reach the peak of fertilizer and water gradually. It is an important period for promoting the growth of weak seedlings and controlling the stable growth of seedlings. It is also a key stage for regulating the rational development of wheat population. The main management task is to regulate the rational development of the group, coordinate the relationship between above and below ground, vegetative growth and reproductive growth, and overall and individual.

1. Application of re-greening fertilizer: returning green fertilizer to the ground, due to reasonable application of seedlings, generally apply 15-20 kg of high-nitrogen compound fertilizer per mu. It can increase the tillering in spring, consolidate the tillering of the year, and increase the number of panicles accordingly; promote the enlargement of the central leaves and the elongation of the base internodes; it is beneficial to the increase of the weak seedlings and the increase of the number of ears per mu. Middle-field or wheat fields with de-fertilization trend should be fertilized early to increase the rate of ear formation; high-yield fields or plots with prosperous trends may not be used or changed to get up well, so as not to cause the group to be too large and stagnate. .

2, squatting, squatting, repression: slashing can break the knot, ventilate, kill grass, prevent drought and protect flood, reduce or prevent freezing damage. Squat can only be used for strong seedlings and over-miao seedlings. Generally, it is carried out before winter, returning to green, and getting up. The depth is more than 10 cm. After squatting, it should be buried. Combined with watering, it can break old roots, spray new roots, Deep rooting, the role of pre-control, such as tillering, can reduce ineffective tillering, promote effective alfalfa growth, and increase the rate of ear formation. Repressing the wheat fields used for growing too much.

3, heavy application of joint fertilizer: generally 20-30 kg per mu of high-nitrogen compound fertilizer, wheat field without potassium fertilizer in the early stage, in this period should be appropriate application of potash. It has the function period of extending flag leaves and other leaves, increasing the number of grains per ear, and promoting the elongation of the lower part of the ear. Wheat fields with small population, yellowish leaf color, small leaves and weak growth should be applied early in the season; the leaves should be normally faded, and the wheat seedlings can be fertilized in the second section. Watering; the leaves are dark green, and the large and drooping wheat fields are postponed until the second section is significantly elongated, and the flag leaves are watered and fertilized when they are unfolded.

Second, the management of the feeding stage of the booting

During the filling stage of the booting stage, the growth of the reproductive organs is the center, and the vegetative growth is basically stopped; it is the key period for determining the grain weight. Photosynthetic products are mainly used for the growth and enrichment of flowers and grains, and the fertilizer and water are gradually reduced. The main management tasks are to preserve roots, protect leaves, prevent premature aging, prevent pests and diseases, and prevent lodging, that is, two guarantees and three preventions to ensure that sufficient nutrients are transported to the reproductive organs.

1. Picking the flag (pregnancy) fertilizer: Fertilization can prolong the green leaf time during the filling period and increase the 1000-grain weight; promote the normal development of pollen grains, reduce the number of florescence degradation, and increase the seed setting rate and the number of grains per spike. This period is the critical period of water. It must be watered in case of drought. Generally, wheat fields with no fertilizer application and fertilizer deficiency in this period can be supplemented with a small amount of nitrogen fertilizer. Generally, 7-10 kg of high-nitrogen compound fertilizer is applied per mu.

2, foliar topdressing: during wheat filling, choose sunny after 4 pm, spray 2% urea +0.3% potassium dihydrogen phosphate solution on the foliar surface, spray 2 times every 7-10 days, can significantly increase production effect.

3. Harvest at the right time: The best period for timely harvesting of wheat is from the mid-wax to the end of waxing. The appearance of the waxy end of the season is: wheat ears, the lower part of the ear and the leaves all turn yellow, the stem is still elastic, the grain is harder and has a luster.