Concept:Cultural practices in crop production are the field operations carried out on crops after planting up to the time of harvesting.
Explanation:These operations are done on the growing crop in the field to promote good growth and increase yield.
Common cultural practices include mulching, weeding, pest control, disease control, fertilizer application, thinning, pruning, earthing-up, and irrigation.
Nursing, on the other hand, is the practice of raising seedlings in a nursery bed before they are transplanted into the main field.
It is carried out before planting, not after, and is therefore a pre-planting operation.
So, nursing is not classified as a cultural practice carried out on the established crop.
Answer:A. nursing