There are ways to control the growth of wheat seedlings and promote their strength.

Before winter, the wheat seedlings flourished, the growth period was advanced, the nutrient accumulation decreased, and the cold resistance decreased, which was not conducive to safe overwintering. Can be classified management according to the reasons for prosperity, control prosperity and promote strength.

First, sow prosperous seedlings formed prematurely.

The leaves of the seedlings were slender and elongated, the tillers were insufficient, and the main stem and part of the tillers entered the two-edge stage before winter. This kind of wheat seedlings are often strong in front and weak later, and will be frostbitten at a low temperature lasting 5 hours and 10 ℃ in winter, which should be suppressed in time to inhibit the growth of main stems and tillers of wheat seedlings and control overgrowth. The crackdown should be carried out on a sunny morning, and should not be suppressed when frost or dew is not dry, so as not to damage the seedlings. After the crackdown, it is necessary to hoe and water winter water in time, and at the same time apply 15 kg of ammonium bicarbonate per mu. Spray 0.2-0.3% Daizhuangsu solution once if necessary to restrain growth and prevent frost injury.

Second, the vigorous seedlings formed by excessive sowing quantity

The seedlings have crowded growth, poor ontogeny and few tillers, so they should be thinned in time, fertilized and watered. Thinning seedlings can establish a suitable population structure and promote individual development. Thinning seedlings combined with watering to supplement an appropriate amount of available nitrogen and phosphorus fertilizer.

Third, prosperous seedlings formed by excessive fertilizer and water

Wheat seedlings have many tillers, broad leaves and serious canopy in the field. We should deeply hoe and cut off the roots, hoe 5 cm and 7 cm between the rows of the wheat field, cut off part of the secondary roots, control the absorption of nutrients, inhibit the occurrence of tillers and cultivate strong seedlings.

4. prosperous seedlings formed by improper selection of varieties

Spring and weak spring varieties sowing prematurely will lead to prosperity before winter and are vulnerable to frost injury. Soil should be choked and dung covered. On the basis of paddling and hoe suppression, the roots of the soil should be cultivated before winter and covered with organic fertilizer to protect the wheat seedlings from overwintering safely.