FORESTRY
SOIL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The type of crops grown in a paddock is changed regularly in a planned order.
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Fast-growing crops are grown and ploughed back into the soil before they seed.
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Part of a crop not harvested for sale can be returned to the soil
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The soil is not cultivated, but seeds are sown directly into the soil.
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Detailed explanation-1: -No tillage increases soil organic carbon storage and decreases carbon dioxide emission in the crop residue-returned farming system.
Detailed explanation-2: -Long-term no-tillage can reduce the disturbance to the soil, reduce the soil organic carbon mineralization rate, and thus maintain the soil organic carbon storage, which is consistent with the results of Lal et al.
Detailed explanation-3: -No-tillage increases soil bacterial diversity and had no significant effect on fungal diversity. Effect of no-tillage on microbial diversity is affected by soil type and stubble retention. Nitrogen application (100–200 kg ha–1) increased soil microbial diversity under no-tillage.
Detailed explanation-4: -It has been well documented that increased tillage intensities can reduce soil organic matter in the topsoil due to increased microbial activity and carbon (C ) oxidation. The potential loss of soil organic matter due to tillage operations is much higher for high organic matter soils than low organic matter soils.