Conservation farming results in

Question

BlackTom AI · Accepted Answer

First, we restate the question and its options to ensure clarity about what is being evaluated: Conservation farming results in
Options:
- Less soil organic matter
- More weed seeds on the soil surface
- Higher soil temperatures
- Less use of herbicides

Option 1: Less soil organic matter. In conservation farming, practices like reduced tillage and residue retention typically help maintain or increase soil organic matter rather than decrease it. Therefore this statement is generally incorrect.

Option 2: More weed seeds on the soil surface. Conservation farming often leaves crop residues on the field and reduces soil disturbance, which can lead to weed seeds accumulating on the soil surface and some weed species thriving in reduced-till, residue-rich conditions. This aligns with observed outcomes in many systems adopting conservation practices, making this a plausible and correct description.

Option 3: Higher soil temperatures. With residue retention shading the soil and reducing tillage, soil temperatures at the surface may actually be more moderated and not necessarily higher; in many cases, temperatures can be cooler or more variable, so claiming universally higher soil temperatures is not typically supported by conservation farming principles.

Option 4: Less use of herbicides. While conservation farming can promote integrated weed management and may reduce herbicide use through cultural practices, it does not automatically guarantee less herbicide use in all contexts. Depending on weed pressure and management decisions, herbicide use might remain the same or even increase in some cases. Hence this statement is not universally true and is more context-dependent.

Putting these analyses together, Option 2 best reflects a recognized outcome of conservation farming practices in many contexts, specifically the tendency for weed seeds to accumulate on the soil surface due to reduced disturbance and residue cover.

In summary, the reasoning shows why the other statements are less consistent with common conservation farming outcomes, and why the statement about more weed seeds on the soil surface accurately captures a typical consequence of these practices.

AGRI20037_2024_SM2 2. Planting to Emergence Review

Conservation farming results in

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