When is it suitable for winter wheat to be watered back to green water? We must pay attention to these three points!

September is the golden period of winter wheat planting in China, and now many areas have begun to be busy with soil preparation, fertilization and seed preparation. It is expected that winter wheat sowing will peak in the middle and second ten days of this month, so after planting winter wheat, when is the most appropriate time to pour back green water? Do you have any points for attention?

Generally speaking, it is most appropriate to water winter wheat with green water in spring.

Returning to green fertilizer and water should be scientific, reasonable and appropriate, if fertilizer and water early will cause too many ineffective tillers of wheat in spring, and the population is too large, on the one hand, it will cause a waste of nutrients, and on the other hand, it will lay hidden dangers for lodging and diseases and insect pests in the later stage.

The following three problems should be paid attention to when wheat is irrigated back to green water in spring:

1. The time of pouring back green water should be determined according to soil moisture.

All wheat fields sown before winter but not irrigated in winter, poor quality of cultivated land, serious loss of soil moisture, and wheat fields with poor ontogeny, small population and serious drought should be poured back to green water in time, and the time to return green water should be when the daily average temperature is more than 3 ℃.

In general, as long as the soil moisture permits, the return of green water should be delayed or not irrigated, and the return of green water should be postponed to the stage of getting up or jointing; for the wheat fields with small population, poor growth or prosperous growth before winter and weak growth in spring, 10 kg of urea can be applied in combination with watering mu. After watering, when the moisture in the wheat field is appropriate, hoe and preserve moisture in time.

2. The amount of water poured back to green water should be strictly controlled.

Due to the great change of day and night temperature in early spring and the frequent alternation of cold and warm air flow, it is appropriate to irrigate a small amount of water rather than flood irrigation, so as to prevent freezing damage to wheat caused by air temperature and ground temperature if the cold current occurs.

3. Pouring back the green water depends on the condition of the seedlings.

For the wheat fields sown in the suitable time before winter, due to the lack of soil fertility, the number of tillers is less, and the number of panicles is not enough (about 500000 total stems per mu before winter) can be irrigated back to green water, combined with the topdressing of 7.5-10 kg urea and 5-7.5 kg potassium sulfate or potassium chloride per mu, in order to promote the tillering of early spring wheat and strive for more panicles as much as possible, so as to lay a good foundation for high yield. Late sowing wheat and strong seedlings with a total stem number of 70 ~ 900000 or more than 900000 generally do not return to green water, but mainly ploughing and loosening the soil, preserving soil moisture and increasing temperature, pressing spring tillers to a minimum; wheat fields that flourish before winter consume much fertilizer and water because of their large growth before winter, but do not be irrigated in winter, and the field moisture is poor, and the cold in early spring can easily lead to dead seedlings, so we should also pay attention to timely watering.