There aren't many exact synonyms for "conservation plowing" as it's a specific technique. However, here are some terms that convey similar ideas or are related to the practice:

Similar Techniques:

* No-till farming

* Reduced tillage

* Minimum tillage

* Direct seeding

* Strip tillage

Related Concepts:

* Sustainable agriculture

* Soil conservation

* Erosion control

* Water conservation

* Land stewardship

More Descriptive Terms:

* Ridge tillage

* Mulch tillage

* Zero tillage

The best synonym will depend on the specific context and what you want to emphasize.