Question

Which of the following is the concentrated organic manure

• A. FYM
• B. Compost
• C. Bone meal
• D. Cow dung

Hint:

Bulky = Low nutrient, Huge volume (FYM).
Concentrated = High nutrient, Small volume (Cakes and Meals).
Think of FYM as "Main Course" for the soil and Bone Meal as a "Multivitamin."

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
Organic manures are broadly classified into "Bulky" and "Concentrated" based on their nutrient content and volume. The question asks to identify the concentrated one.
Detailed Explanation:

• Bulky Organic Manures:
These contain a small percentage of nutrients and are applied in large quantities (tonnes per hectare). They primarily improve soil physical properties.
Examples: Farm Yard Manure (FYM), Compost, Cow dung, Green manure.

• Concentrated Organic Manures:
These are made from raw materials of animal or plant origin that contain higher percentages of N, P, or K compared to bulky manures. They are applied in smaller quantities (quintals per hectare).
Examples: Oil cakes (Neem cake, Mustard cake), Bone meal, Blood meal, Fish meal.

• Bone Meal:
Bone meal is prepared by grinding bones. It is particularly rich in Phosphorus ($20-25\%$) and contains some Nitrogen ($3-4\%$).
Because its nutrient density is much higher than FYM ($0.5\%$ N), it is categorized as a concentrated manure.

• Analyzing Options:
FYM, Compost, and Cow dung are all "Bulky." Only Bone meal is "Concentrated."

Step 2: Final Answer:
Bone meal is a concentrated organic manure.