这是一篇美国论文代写范文：American agriculture，讨论了美国农业。作为一个发展保护性耕作多年的国家，美国仍然在广泛而深入地开展试验研究，为进一步发挥保护性耕作的潜力而努力，他们的不少经验和做法值得我们借鉴与思考。美国农业发达的国家，长期的农业自由贸易，促进了农业的飞速发展，并积累了大量先进的科学技术的致富经验。农场主要在市场的要求下，生产出市场所需要的产品，营销公司将农场的产品加工后推向市场，消费者最后买到的是最适合自己消费习惯的农产品，正是这种良性的生产、销售体系使农业生产进入到了良性循环之中。
As a country that has developed conservation tillage for many years,the United States is still carrying out extensive and in-depth experimental research to further realize the potential of conservation tillage.
作为一个多年来开展保护性耕作的国家，美国仍在进行广泛而深入的实验研究，以进一步发挥保护性耕作的潜力。
New ideas on the best conservation tillage scheme are put forward.At the annual conference of agricultural engineering,American scholars proposed that the best mode of conservation tillage suitable for the United States is not no tillage,but deep pine and large amount of straw mulch.They argue that 30 percent of the crop is not covered enough,and that more than 70 percent or even 100 percent of the crop should be covered to give full play to the benefits of conservation tillage.The function of covering is more important than that of no-tillage.It is believed that deep pine is beneficial for rainfall infiltration,erosion reduction and water storage,and has obvious effects on dry farming.Another reason for the emphasis on deep pines in the United States is that the trampling and need to become loose during the winter and spring when livestock graze on the ground.
提出了最佳保护性耕作方案的新思路。在农业工程年会上，美国学者提出，适合美国的最佳保护性耕作方式不是免耕，而是深松和大量的秸秆覆盖。他们认为，30％的作物没有得到足够的覆盖，应该覆盖超过70％甚至100％的作物，以充分发挥保护性耕作的优势。覆盖功能比免耕更重要。认为，深松有利于降雨入渗，减少侵蚀和蓄水，对旱作农业具有明显的效果。在美国强调深松的另一个原因是，在冬季和春季牲畜在地上吃草时，践踏和需要变得松散。
We will vigorously develop covered crops.A one-year crop called ryegrass,which covers farms across Indiana in the winter,is not herbage,but a protective farming system.Covering crops has become an important part of America's efforts to improve conservation tillage systems.
Quantitative study of drought resistance.In auburn,Alabama,for more than 100 years,conventional and conservation tillage on each side of the plot was found to be less than half a metre high for conventional maize and more than a metre high for conservation tillage.Some plots of conservation tillage and traditional crops are dry.The purpose of the experiment is to let farmers know that conservation and conservation tillage can improve drought resistance,but it is also limited.For example,during the drought in this county,farmers can survive for about 3 weeks longer.Some experimental stations are studying the drought resistance of conservation tillage quantitatively,which can be used as reference for farmers'production decisions.
Pay attention to the conservation tillage system research Georgia experiment stations,a report said the local farmers would not cover crops,because of the need to spending the extra cost,but with cattle,cattle can eat spring cover crops,income more than the cost of planting cover crops,conservation tillage with cattle in the local development direction.More papers suggest that conservation tillage should become an integrated production system,combining farming,crop mulching,crop rotation,and pest control techniques.
Six scientists at the U.S.department of agriculture's research station in auburn,Alabama,have spent more than$3 million a year studying conservation tillage for nearly a decade,according to the chief scientist.At two of the meetings,American scientists presented papers on conservation tillage,mostly project findings.This is a far cry from the notion that conservation farming in the United States has been going on for decades,and is now primarily applied.Conservation tillage,it seems,is a technology that is constantly being enriched and developed.It is far from being realized.Conservation tillage is developing in the same way around the world,with new conservation tillage patterns,techniques,tools and benefits being reported.
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