这意味着表层土壤几只含有少量长期成功耕作所必需的成分。
This means topsoil contains few of the ingredients needed for long-term successful farming.
最环保的农业生产方式似乎是“免耕”播种，这一生产方式很少或不再耕作，依赖表层植被并谨慎使用除草剂。
The most environmentally benign form of agriculture appears to be "no till" farming, which involves little or no ploughing and relies on cover crops and carefully applied herbicides to control weeds.
结果表明，根系生物量、根系体积、侧根数在不同耕作方式间差异明显，在土壤中表现为从表层到深层逐渐递减。
The results show that there are difference among different cultivation way in root system biomass, root system volume and the number of secondary root.
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