A soil has pH 9. What is the general idea to balance it for crops?
Answer and explanation
Correct answer: Carefully add organic matter that gives an acidic effect
A pH of 9 indicates that the soil is distinctly basic or alkaline. To move its pH toward a range more suitable for many crops, the general principle is to add a suitable mildly acidic amendment, often organic matter such as compost or well-managed manure, according to soil testing. Therefore option A is the best general answer. Slaked lime and sodium hydroxide would increase alkalinity, while soap is not an appropriate soil amendment.
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What is the correct answer to this question?
Carefully add organic matter that gives an acidic effect
Why is this the correct answer?
A pH of 9 indicates that the soil is distinctly basic or alkaline. To move its pH toward a range more suitable for many crops, the general principle is to add a suitable mildly acidic amendment, often organic matter such as compost or well-managed manure, according to soil testing. Therefore option A is the best general answer. Slaked lime and sodium hydroxide would increase alkalinity, while soap is not an appropriate soil amendment.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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