作者称，伴随着生物原料转变成塑料成品的整个过程，这些影响主要来自于化肥，杀虫剂的使用以及退地还耕的举措。
These impacts came largely from fertilizer use, pesticide use and conversion of lands to agricultural fields, along with processing the bio-feedstocks into plastics, the authors reported.
通过田间定位试验和土壤水分的测定，探讨了免耕和秸秆覆盖还田对小麦、油菜土壤水分利用效率的影响。
Through fixed field experiment and determinations of soil moisture, the field water utilization efficiency of wheat and rape seeds was discussed under no tillage and straw mulching.
深松耕还田显著提高土壤脲酶、蔗糖酶活性。
Subsoiling returning could significantly increase soil urease activity and sucrase activity.
通过对土壤微生物分析评价发现，在提高土壤质量和利于作物生长方面，少量秸秆还田少耕要优于少量秸秆还田翻耕和免耕。
The proof could be provided by the microbial results that minimum tillage with minimum straw was a better technology to improve soil quality and do good to crops than tillage or no tillage.
研究施钾和秸秆还田对华北地区不同种植制度下作物产量和耕层土壤钾素状况的影响。
Effect of application of K fertilizer and wheat straw to soil on crop yield and status of soil K in plough layer under different planting systems was studied.
提出了一套简单易行的麦稻秸秆全量整草免耕还田方法。
Series of feasible means of all wheat and rice straw application without chopping and cultivation were put forward.
保护性耕作是相对于传统耕作的一种新的耕作技术，是作物茎秆还田和免耕、少耕技术的结合。
The protective cultivation, which is relative to traditional cultivation, is a new cultivation technique which combines with crop straw incorporated into field, no-tillage and reduced tillage.
该研究可为秸秆还田免耕技术在东北黑土的实践和重建黑土高效生产功能提供重要的理论依据。
These findings provide theoretical basis for the application of no-till practices and understanding how to rebuild soil sustainability in the northeast of China.
结果表明，免耕抛秧比常耕抛秧增产7.64%，稻草还田免耕抛秧与稻草还田常耕抛秧产量差异不大，但分别比常耕抛秧高10.72%和8.22%。
Results showed that NTCTR harvested 7.64% more grain than CTCTR, NTCTSIR and CTCTSIR harvested almost the same grain, but 10.72% and 8.22% more than CTCTR, respectively.
土地生产力、秸秆还田量和土壤水文状态是导致不同利用方式下耕层土壤有机碳含量差异的主要原因。
It is illustrated that the land productivity, amount of straw returning and soil hydrological condition were main factors determining the differences in the SOC contents at various land-use types.
研究了不同秸秆还田量对免耕黑土速效养分含量和玉米产量的影响。
In this study, the effects of different amounts of residue incorporation on the contents of soil available nutrients and corn yields were examined under no-till practices.
研究了不同秸秆还田量对免耕黑土速效养分含量和玉米产量的影响。
In this study, the effects of different amounts of residue incorporation on the contents of soil available nutrients and corn yields were examined under no-till practices.
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