When the soil starts to freeze, irrigate the overwintering water, and flood it with flooding. Let it dry for 2 to 10 days. After the surface soil is dry, bury the soil to prevent cold, so as to avoid premature burying of the soil causing sprout eyes to rot. The winter irrigation time is carried out just before or before the soil freezes. The amount of irrigation varies according to the different soil quality. The sandy land is about 70 cubic meters per mu, and the other soil quality is about 50 cubic meters. Approximately 40 to 30 days before germination (approximately at the end of February in Guanzhong, Shaanxi) according to the weather conditions, apply germination fertilizer and irrigate once.
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