What is the metaphor of wheat straw?

The metaphor of wheat straw is as follows

Comprehensive utilization of straw is known as "picking up the other half of agriculture". How to turn waste into treasure, achieve the best use of "straw", and eat "Stalk" squeezed out? In recent years, our city has actively explored and established a straw utilization system of "collection, storage and use". From "returning to the field" to "leaving the field", the comprehensive utilization of straw truly turns "ecological burden" into "green wealth".

Walking into a wheat field in Hongqi Village, Xindian Town, everything is golden and a scene of abundant harvest. With the roar of the harvester, rows of wheat are rolled into the machine. After the wheat threshing is completed automatically, the wheat straw is crushed into pieces by the harvester and buried in the soil, so that the straw fragments are fully integrated with the soil, and immediately become the field of “superior” fertilizer.