Relationship between traditional farming irrigation culture and calendar in China

The traditional farming culture in China is closely related to the lunar calendar, and many proverbs about solar terms are recorded. In the south of China, we often have such a saying: it is time to plow in the spring rain; Tomb-Sweeping Day is the season of spring sowing, with "planting melons and beans before and after Qingming Festival" and "planting rice after Qingming Festival" (only one season of rice can be planted in ancient times, and seedlings will not freeze to death after Qingming Festival); "Small full, regardless of length" (small full, regardless of length, must be inserted into the field); "Grain wheat does not eat small full water, and flour wheat does not eat long summer water" (barley must be harvested when small full, and wheat must be harvested when long summer); Rice should be harvested before the Millennium, "the Millennium will fall without cutting" (meaning that rice will fall off before the Millennium is harvested); "Seven onions and eight garlic" (planting onions in July and garlic in August); "There is Koharu in October" and "beginning of winter harvests potatoes to grow wheat" (digging sweet potatoes to grow wheat in beginning of winter season) ... Therefore, the traditional lunar calendar is closely related to agriculture.