What is the practice of leaving the stalks of crops in the ground to anchor topsoil?

No-till farming

Explanation:

No-tillage is a technique designed to reduce the negative effect of agricultural machinery and soil agriculture itself. Unlike traditional planting processes, no-tillage soil is only handled during planting, when a furrow with a special seeder is opened and then fertilizers and seeds are deposited. After this process, the soil rests while weeds, weeds and diseases are controlled. In this case, no-tillage is the practice of leaving the stalks of crops in the ground to anchor topsoil.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.