Intellectual Olympiad in Soil Science - 2026 ongoing
1000 ₸
Subject: Soil Science Level: VII (I is easiest, XII is hardest)
Category: student
Question language: English
Questions: 15
Example question: A soil has a cation-exchange capacity of 25 cmol(+) kg⁻¹ and contains 5 cmol(+) kg⁻¹ of exchangeable calcium. What percentage of the exchange sites is occupied by calcium? 10%, 15%, 20%, 25%