There's unpredictable weather, changes in soil quality, and the ever-present possibility that pests and diseases may pay a visit.
天气不可预测，土壤质量发生变化，害虫和疾病随时都可能出现。
Soil biological and biochemical variables are considered to be essential to measure changes in soil quality.
土壤生物化学性质是重要的监测土壤变化的参数。
Soil enzyme activity varied obviously with duration of vegetable plantation and could be cited as a sensitive indicator of changes in soil quality.
不同利用年限菜地土壤酶活性变化幅度较大，能够更为敏感的指示土壤质量的变化。
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