Farmers think that using more nitrogen and potassium fertiliser will produce higher yields and this only leads to problems such as water pollution and hardening of the soil.
农民以为施用了更多的氮肥钾肥就可以得到更高的产量，这才带来了水体的污染、土壤的板结等问题。
The stress - strain relationship of soil estabished from shear tests is distinguished into two kinds-progressive hardening type and post-peak softening type.
将土的剪切试验测得的应力-应变关系分成逐渐硬化类型和峰值后软化类型，提出了可以统一表示这两种类型应力-应变关系的表达式。
The physical structure of the soil basically showed favourable characteristics except for hardening.
而物理性状（除土壤板结外）基本是良好的土壤物理构造。
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