Organic matter breaks down swiftly within Pakistani soils due to ____________ conditions, which explains why local soils typically maintain organic matter levels below 1%:
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Answer: C. Both a & b
Explanation
High ambient temperatures accelerate microbial respiration rates and speed up organic matter decomposition. Alkaline soil pH conditions further promote the enzymatic activity of soil microbes breaking down residues. Combined high temperatures and alkaline chemistry explain why local soils maintain very low organic matter. Soil organic matter consists of plant and animal residues in various stages of microbial decomposition. Microbial populations thrive and consume carbon rapidly when thermal and chemical environments are favorable. Arid and semi-arid climates naturally restrict the accumulation of organic carbon in surface soils.
Farmers in hot arid regions must continuously add organic amendments to improve soil structure. Low organic matter limits the natural fertility and water retention capacity of agricultural fields. Understanding decomposition rates helps agronomists design better crop residue management strategies for farms. High temperature alone drives decomposition, but alkaline soil conditions also play a contributing role. Alkaline pH influences microbial communities, yet temperature remains a primary driver of organic decay. Rejecting both valid factors ignores the combined environmental drivers operating in local agricultural soils.
- Subject
- Agriculture
- Category
- Agriculture
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- —
- Difficulty
- medium
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