Concept:Soil fertility means keeping essential plant nutrients in the soil so crops can grow well.
A farmer should avoid any practice that removes nutrients faster than they are replaced.
Explanation:Continuous cropping means planting the same crop on the same land every year without a break.
This practice is harmful because the same crop keeps taking the same nutrients from the soil.
Over time, those specific nutrients become severely depleted, and the soil becomes infertile.
It also increases the risk of soil erosion and makes the land less productive.
Crop rotation is good because different crops use and restore different nutrients.
Legumes can even add nitrogen to the soil naturally.
Consistent manuring adds organic matter and nutrients back to the soil.
Fertilizer application also replaces missing nutrients to keep the soil productive.
Therefore, continuous cropping is the practice a farmer should NOT use.
Answer:B. continuous cropping.