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To enhance the growth of alfalfa, the addition of manure is particularly beneficial due to its rich nutrient content and organic matter. Manure provides essential macronutrients such as nitrogen, phosphorus, and potassium, which are critical for plant growth and development. Additionally, the organic matter from manure improves soil structure, promotes water retention, and enhances microbial activity, all of which contribute to a healthier growing environment for alfalfa.

While fertilizers can also provide necessary nutrients, they often focus on delivering specific elements in a concentrated form rather than improving overall soil health. Chalk, being primarily a source of calcium, is used to amend soil pH but does not provide the broader range of nutrients that alfalfa requires. Compost, although beneficial for soil health and providing organic matter, may not always meet the specific nutritional needs of alfalfa as effectively as manure does. Thus, manure stands out as the most effective amendment for improving alfalfa growth.