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  3. (46) U.S. farmers are planting more acres of crops using soil building and pollution fighting faming systems than traditional me

(46) U.S. farmers are planting more acres of crops using soil building and pollution fighting faming systems than traditional me

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问题     (46) U.S. farmers are planting more acres of crops using soil building and pollution fighting faming systems than traditional methods that rely on the plow or intensive  tillage, according to a report due to be released early next month.
    The report, titled "National Crop Residue Management Survey," shows a 6 million acre gain for environmentally friendly farming systems this year.
    (47) It also shows traditional farming methods, which result in greater soil erosion and run off from fields, declined by 4 million acres.
    (48) The survey, conducted on a county-by-county basis by USDA Natural Resources  Conservation Service, indicates that farmers in Iowa, Illinois, South Dakota, Kansas, and Indiana contributed the most to the increase in acres grown with environmentally  friendly farming systems known as conservation tillage systems.
    These states accounted for 5 million of the 6 million acre increase in conservation tillage this year.
    All conservation tillage systems, such as no-till, mulch-till, ridge-till, strip-till, and zone-till, rely on less tillage or less soil disturbance to plant and manage crops.
    Farmers who use these systems leave plant materials stems, stalks, and leaves—on the surface of fields after harvest.
    The plant materials, also called crop residues, serve as a blanket to protect the soil from erosion.
    The crop residues slowly decompose to add organic matter to the soil much like mulching or composting add organic matter to a garden.
    The survey results for 1997 indicate that conservation tillage systems now account for 109.8 million acres or fully 37 percent of the 294.6 million annually planted cropland acres in the United States.
    In the meantime, traditional systems that rely on the plow or intensive tillage fell to 107.6 million acres this year.
    The remaining acres are in an intermediate farming system known as reduced till.
    (49) The head of the nonprofit center that compiles and publishes the annual survey is calling on consumers and farmers alike to focus increased attention on conservation tillage systems.
    "(50) Independent research and practical application across the country show that these systems not only replenish and build organic matter in the soil for improved fu ture food productivity but they will also protect water quality and enhance wild life and the environment for future generations," says John Hebblethwaite, executive director of the Conservation Technology Information Center. "There is also growing evidence that these systems can even help us combat the potential for global warming," he adds.
    Conservation tillage has long been credited for protecting water quality by reducing runoff from farm fields, according to Hebblethwaite.
    He notes the latest research also indicates that soil enriched by crop residues offers  natural protection for groundwater.
    Conservation tillage systems save the farmer money by reducing trips through the field for planting and cultivation.
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答案据将于下个月初发表的一项报告说，美国的农业经营者采用培育土壤和降低污染的耕作法种植的农作物面积已经超过了依靠犁耕和密集耕作等传统方法来种植农作物的面积。
解析     句子的框架是U.S farmers are planting more acres of crops…than traditional methods that rely on the plow or intensive tillage，…。此句的主、谓语部分内容简单：U.S farmers are planting…，但宾语部分内容较复杂，含有一个比较级：more acres of crops using…than (acres of crops using)traditional methods…，然后后面紧跟that引导的定语从句修饰traditional methods；using…systems作为现在分词修饰crops，soil building和pollution fighting并列作为定语修饰farming systems；“according to…”是状语部分，翻译时可提至句前；due to do翻译为“预计做……”。
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