Which herbicide is inactive in soil and moves with sugar flow in plants?

Glyphosate is a systemic herbicide that is well-known for its mode of action and its behavior in the environment. It works by inhibiting a specific pathway that is crucial for plant growth and development, known as the shikimic acid pathway. One of the key characteristics of glyphosate is its lack of soil activity; it binds tightly to soil particles and thus remains inactive in the soil. This means that glyphosate does not have pre-emergent activity and remains available to affect only the plants that absorb it.

Once applied to a plant, glyphosate enters through the foliage and is transported throughout the plant via the phloem, the part of the plant that moves sugars and other organic nutrients. This allows glyphosate to affect even parts of the plant that did not come into direct contact with the chemical.

The other herbicides listed do not share the same properties. For instance, 2,4-D is active in the soil and targets broadleaf weeds specifically. Paraquat is a contact herbicide that does not move through the plant and has significant activity in the soil, while phenoxy herbicides are a class including 2,4-D that also demonstrate soil activity and impact specific weed types. This understanding