When is the best time to fertilize wheat? What principles should be followed?

Wheat is one of the main food crops in China, which has certain economic value. It can be used not only as food, but also as feed, and can also be processed into cakes, drinks and other food. Wheat is planted in all parts of our country, and the planting time is different in different regions. Let's take a look at the best time to fertilize wheat. What principles should be followed?

When is the best time to fertilize wheat?

After the beginning of spring, winter wheat enters the green stage, followed by tillering stage to jointing stage, these two growth stages are very critical for high-yield winter wheat. The period from turning green to picking flag of winter wheat is the spring growth stage, which usually lasts 50-60 days. It is a key period for yield formation. The application of jointing and booting fertilizer in spring is not only the key to promote the transformation and robust growth of wheat seedlings, but also an important measure to ensure high and stable yield.

Second, what principles should be followed in wheat fertilization?

1. Apply sufficient base fertilizer

General base fertilizer accounts for 60% to 70% of the total fertilizer, with about 3 tons of organic fertilizer per mu, plus 10 kg of urea, 40 kg of calcium superphosphate and 7.5 kg of potassium chloride. You can also use organic fertilizer combined with 45% compound fertilizer 20 kg, which can be applied into the soil as base fertilizer.

2. Seed fertilizer and seedling fertilizer

The application of appropriate amount of chemical fertilizer as seed fertilizer during wheat sowing can promote wheat rooting and early tillering, especially for late stubble wheat or wheat with insufficient base fertilizer. The urea used as seed fertilizer is less than 2.5 kg per mu. In addition to seed fertilizer, early application of seedling fertilizer (tiller fertilizer) is also a good measure to promote root tiller and effective tiller. Tillage help planting net recommended in the seedling fertilizer in the three-leaf stage, with urea per mu of about 5 kg. If the base fertilizer is sufficient, the large population should apply less; if the base fertilizer is less, more should be applied to the weak seedlings. In the northern wheat region, wheat enters the green stage after winter. in order to consolidate the tillering before winter and promote the tillering after the winter, the returning green fertilizer should be applied early. Return to green fertilizer should be based on quick-acting fertilizer, generally 10-15 kg of ammonium sulfate and 10 kg of calcium superphosphate per mu. If there is enough fertilizer in the early stage and the wheat seedlings grow vigorously, there is no need to apply green fertilizer, especially in the south, this time the fertilizer should be decided according to the seedling condition.

3. Skillfully applying jointing and booting fertilizer

The jointing and booting stage of wheat is the most exuberant period in its life, which requires a large amount of nutrients. if it is de-fertilized, it will lead to premature senescence of wheat. However, too much fertilizer will cause the plant to grow excessively, which is not conducive to the differentiation and development of young spikes. Therefore, jointing and booting fertilizer should be skillfully applied to seedlings: for weak seedlings, such as small population, the total number of tillers per mu is less than 300000 per mu, and the leaves fade and turn yellow, jointing fertilizer should be applied early to improve tillering into panicles, strive for more spikes and large ears, urea 3kg / mu can be used, and water should be applied. For robust wheat seedlings, because the population is suitable and the number of panicles is guaranteed, we should focus on large ears, properly control fertilizer and water at jointing stage, make the basal internodes stout, prevent lodging, wait for leaf color to fade naturally, the first Internode is fixed in length, and when the second internode grows rapidly, about 3 kg of urea per mu; for the prosperous seedlings with large leaf area and thick green leaves, fertilizer and water should be controlled, root injury and tillering should be controlled in deep tillage, and there is no need to topdressing.