Soil Module 1 Quiz | OceanRemote Education

1 What does N in NPK stand for?

A) Nitrogen B) Nitrate C) Nickel D) Neon

2 What does P in NPK stand for?

A) Potassium B) Potash C) Phosphorus D) Phosphate

3 What does K in NPK stand for?

A) Nitrogen B) Potassium C) Phosphorus D) Calcium

4 What NPK range is optimal for maize?

A) N:100, P:20, K:100 B) N:150-200, P:30-50, K:150-250 C) N:50, P:10, K:50 D) N:300, P:80, K:400

5 What does fertilizer label "10-20-10" indicate?

A) 10kg N, 20kg P, 10kg K B) 10-20-10 pounds per bag C) 10% N, 20% P, 10% K D) 10 bags for $20

6 What nitrogen level triggers "VERY LOW" recommendation?

A) < 100 mg/kg B) < 150 mg/kg C) < 200 mg/kg D) < 50 mg/kg

7 How much water on average can NPK testing save in fertilizer costs?

A) 10-20% B) 30-50% C) 70-80% D) 5-10%