纸质地膜可能将取代塑料地膜-凯发k8官网

纸质地膜可能将取代塑料地膜
文章来源:未知 文章作者:enread 发布时间:2010-12-29 03:05 字体: [ ] 
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polyethylene(聚乙烯) mulches(覆盖物) , used widely in commercial vegetable production to improve crop yields and produce quality, have distinct disadvantages. disposal options are limited, and plastic mulches often end up in landfills, being burned, or disposed of illegally. recycling polyethylene mulches is also a challenge; the mulches used in large-scale vegetable production are contaminated with too much dirt and 1 to be recycled directly from the field in most power plants and incinerators(焚化炉) . timothy coolong from the university of kentucky's department of horticulture published a report on paper mulches in horttechnology that may give vegetable producers 2 alternatives to polyethylene. the recent trend toward eco-friendly production techniques has resulted in a second look at biodegradable paper mulches, which are manufactured from renewable resources and do not have to be removed from the field after harvest. paper-based mulches have been used in agriculture since 1914, but some paper mulches 3(恶化) rapidly under field conditions, reducing their effectiveness. paper mulches have other limitations; since they are heavier than polyethylene, transportation costs are higher, and paper mulches are inherently(内在地,固有地) more expensive than polyethylene.

coolong's research evaluated the performance of four readily obtainable papers compared with traditional black plastic using conventional plastic laying equipment and a water wheel transplanter. the experiments were conducted in lexington, kentucky, over two growing seasons using yellow squash. crop yield and quality, weed biomass, soil temperatures under the mulch, and mulch 4 were evaluated. four paper mulches—50-lb kraft paper, 50-lb polyethylene-coated kraft paper, 40-lb white butcher paper, and 30-lb waxed paper—were compared with 1-mil black polyethylene mulch in two weeding treatments (bare-ground hand-weeded and bare-ground nonweeded).

in the fall 2007 experiment, butcher paper and polyethylene-coated kraft paper controlled weeds as well as black plastic mulch. however, in spring 2008, black plastic mulch provided superior weed control compared with other mulches. yields among waxed, butcher, and polyethylene-coated kraft papers were similar to black plastic mulch in 2007, though yields in paper mulch plots were significantly less than plastic mulch in spring 2008. coolong observed that most of the paper mulches were able to be placed with a plastic mulch layer, but were not well-suited for use with a water wheel transplanter.

"our results suggest that in some situations, paper mulches may provide a more sustainable alternative to traditional black plastic mulches. results with the polyethylene-coated kraft paper suggest that efforts to combine paper with biodegradable films to create mulches may prove worthwhile," observed coolong. he cautioned that although paper mulches can be effective, cropping conditions and the environment will influence effectiveness, adding that "if paper mulches are ever to be used on a large scale, they will have to be used in conjunction with mulch laying equipment and perhaps mechanical transplanters".



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1 debris     
n.瓦砾堆,废墟,碎片
参考例句:
  • after the bombing there was a lot of debris everywhere.轰炸之后到处瓦砾成堆。
  • bacteria sticks to food debris in the teeth,causing decay.细菌附着在牙缝中的食物残渣上,导致蛀牙。
2 mi2wz     
adj.可行的,切实可行的,能活下去的
参考例句:
  • the scheme is economically viable.这个计划从经济效益来看是可行的。
  • the economy of the country is not viable.这个国家经济是难以维持的。
3 zm8zw     
v.变坏;恶化;退化
参考例句:
  • do you think relations between china and japan will continue to deteriorate?你认为中日关系会继续恶化吗?
  • he held that this would only cause the situation to deteriorate further.他认为,这只会使局势更加恶化。
4 qxkxl     
n.降级;低落;退化;陵削;降解;衰变
参考例句:
  • there are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。
  • gambling is always coupled with degradation.赌博总是与堕落相联系。
tag标签: paper plastic mulches
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