It is often said that Tomb-Sweeping Day planted melons before and after. Why do some schools choose to start planting so early?

It is often said that melons were planted in Tomb-Sweeping Day before and after, and some schools chose to start planting at that early time because of their resource advantages.

Before and after Tomb-Sweeping Day, the main reasons for planting melons and beans were: in Tomb-Sweeping Day with 24 solar terms, when the sun moved to longitude 15 degrees, Tomb-Sweeping Day began to breathe. At this time, the temperature is getting warmer, plants are sprouting, the weather is sunny, and everything is thriving. Every year after the vernal equinox, the days get longer, the nights get shorter, the sunshine intensity increases, the earth temperature rises, the lip temperature rises, the temperature is very low in the morning and evening, and the temperature is high at noon. The farmers are preparing to plow the fields, send fertilizer to the soles of their feet, and ditch for spring sowing.