只有作物：是否有覆盖作物？
有机物施加于任何土壤都是很宝贵的，不管施加的是厩肥、覆盖作物或是改土作物。
Organic matter is invaluable as an addition to any soil whether applied as manure as a cover crop or as a soil-improving crop.
同时，在相同环境条件下对有作物覆盖的土壤床和无作物覆盖的土壤床中的水热分布也进行了模拟比较。
The simulation is also made to describe the heat and mass distribution under the same environmental conditions between vegetation soil-bed and bare soil-bed.
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