Sure! Here are the suggested answers to fill in the blanks:
A) Farm yard manure is primarily composed of animal waste and organic matter.
B) The organic fertilizer should not contain materials such as synthetic chemicals, heavy metals, and pathogens.
C) Farmers use personal protective equipment (PPE) as a protective measure to avoid direct contact with fertilizer.
D) A farmer notices yellowing of leaves in plants. This is often a sign of nitrogen deficiency.
Feel free to ask if you have more questions or need clarification!