16. Her results show that reducing emissions is more complicated than just cutting back on nitrogen fertilizers and changing croprotation cycles.
她的研究结果表明，减少排放要比只是减少氮肥的使用和改变作物轮作周期复杂得多。
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17. Crop rotation: the successive planting of different crops on the same land to improve soil fertility and help control insects and diseases.
轮作：在同一块土地上连续种植不同的作物以提高土壤肥力并帮助控制昆虫的生长和疾病的蔓延。
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18. The nitrogen contents and nitrogen forms were studied in albic soil with longterm crop rotation and soybean, maize, wheat continuous cropping.
对轮作及大豆、玉米、小麦长期连作白浆土中氮含量及有机态氮组分变化进行研究。
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19. But the system has also encouraged farmers to alter time-honored crop rotation practices and the mix of herbicides that previously had kept weeds in check.
但是该体系鼓励农民改变长期以来的轮作制度和混合使用除草剂，在以前这些方法很好的控制了杂草。
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20. The result showed, comparing with sole cropping, the land use efficiency of sequential cropping, row cropping, crop rotation raised by 62%, 38% and 21%.
结果表明，与单作一熟农田相比，复种、间作及轮作农田土地利用效率分别提高62%、38%和21%；
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21. He practiced croprotation and soil conservation a century before these became standard practice and he invented a plow superior to any other in existence.
在人们普遍利用农作物轮作和土壤保持的作法前一个世纪，他就这样做了。
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22. Between 1000 and 1300 Europe's urban population more than doubled, to about 70m (thanks partly to a new system of crop rotation, made possible by better tools).
23. He practiced croprotation and soil conservation a century before these became standard practice, and he invented a plow superior to any other in existence.
他练习作物轮作、水土保持一个世纪之前，这些被成为标准的做法，他发明了一种犁优于其他任何存在。
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24. He practiced croprotation and soil conservation a century before these became standard practice, and he invented a plow superior to any other in existence.
在人们普遍利用农作物轮作和土壤保持的作法前一个世纪，他就这样做了。
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25. He practiced crop rotation and soil conservation a century before these became standard practice, and he invented a plow superior to any other in existence.
他实践了轮作和土壤保护每世纪在这些成为了标准操作之前，并且他发明了一个犁优胜者对些其他存在。
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26. The location tests of different blend ratio between controlled-release urea and conventional urea in wheat-corn crop rotation system in Xinpo Village Zhumadian city are studied.
在驻马店新坡村进行了小麦一玉米轮作制下的控释尿素与普通尿素掺混比例定位试验研究。
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27. Using traditional techniques such as crop rotation, compost and manure to supply the soil with nitrogen and other minerals would have required a tripling of the area under cultivation.
如果采用传统技术如轮作和堆肥为土壤补充氮和其他物质，就需要耕地也增长三倍了。
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28. Using traditional techniques such as crop rotation, compost and manure to supply the soil with nitrogen and other minerals would have required a tripling of the area under cultivation.
