Which of the following are organic manure? A. Farmyard manure B. Urine manure C. Ammonium sulphate D. Muriate of potash E. Single super phosphate

Correct option is A

The correct answer is (A) A & B only

Explanation:
• Organic manures are natural materials derived from plants or animal waste that are added to the soil to improve its fertility and physical properties.
• Farmyard manure (FYM) is a decomposed mixture of dung and urine of farm animals along with litter and left-over material from roughages or fodder fed to the cattle.
• Urine manure (sheep/goat/cattle urine) is rich in nitrogen and potash and is a purely organic source.
• Why C, D, and E are wrong: These are 'Chemical/Inorganic Fertilizers'. Ammonium sulphate is a synthetic nitrogenous fertilizer; Muriate of potash (KCl) is a potassium fertilizer; Single super phosphate is a phosphatic fertilizer produced by treating rock phosphate with sulfuric acid.

Information Booster:
• Bulky organic manures include FYM, compost, and green manure.
• Concentrated organic manures include oil cakes, bone meal, and fish manure.
• Organic manures improve soil structure, water-holding capacity, and microbial activity, which chemical fertilizers do not do.

Additional Knowledge:
• Vermicompost is another popular organic manure produced by the action of earthworms.
• Green manuring involves growing and ploughing-in green crops (like Sunnhemp or Dhaincha) into the soil.