外文翻譯--節(jié)水灌溉(文件)
【正文】 但流量加大了，毛管相應(yīng)也要加粗些，在每棵作物或樹(shù)下裝 1～ 2個(gè)微噴頭一般即可滿足灌溉的需要。但其最大缺點(diǎn)就是滴頭出流孔口小，流速低，因此堵塞問(wèn)題嚴(yán)重。主要缺點(diǎn)是受風(fēng)影響大，設(shè)備投資高。田間水利用率可達(dá)80%～ 90%。 (一 )地面灌溉 地面灌溉是古老的傳統(tǒng)的灌水方法，一般說(shuō)來(lái)它是作為比較是否節(jié)水的基點(diǎn)。 gullies on the construction of embankments, or in suitable locations for the construction of water cellars, storing runoff solve drinking water and a small area irrigation water。 河 北 農(nóng) 業(yè) 大 學(xué) 本科畢業(yè) （設(shè)計(jì)） 論文 外文文獻(xiàn)翻譯 學(xué) 院： 城鄉(xiāng)建設(shè)學(xué)院 專業(yè)班級(jí)： 農(nóng)業(yè)水利工程 0901 班 學(xué) 號(hào)： 2020224010113 學(xué)生姓名： 周飛 指導(dǎo)教師姓名： 高惠嫣 指導(dǎo)教師職稱： 講師 二 零一三 年 三 月 1 Watersaving irrigation 1. Existing watersaving irrigation methods Irrigation methods, field water distribution method is how to have been sent to the farms, the irrigation water is evenly distributed to the active layer of the crop root. Irrigation water is the means by which to enter the active layer of roots, irrigation methods can be divided into surface irrigation, sprinkler irrigation, microirrigation and underground irrigation. surface irrigation Surface irrigation is an ancient traditional irrigation method, in general, it is as pare whether watersaving basis points. Surface irrigation technology are constantly develop and constantly improve, so there are many more waterefficient than traditional surface irrigation technology. new furrow irrigation tools Traditional furrow irrigation with artificial opening from the distribution channel water into the furrow, it is neither accurate and inconvenient, and often cause the field of water loss due to water port leakage countries have already adopted the siphon (for open channel water ) or gate hole pipe (aqueduct) drainage, China has done a number of tests, proven to improve field water utilization rate of 5% to 10%. surge irrigation Modern foreign developed wave Chung (groove) border irrigation or intermittent ditch (furrow) irrigation, traffic control into the ditch (furrow) is intermittent water and then put a period of time (a few minutes or tens of minutes) to field stop the water for some time (a few minutes or tens of minutes), and so forth, so that you can make along the ditch (furrow) the length direction of the water distribution is more uniform. Fields of water utilization up to 80% to 90%. Film hole irrigation (also known as the film hole irrigation) Gully, made on the film of water flow in the membrane, crops grow hole to perate the land, so that irrigation efficiency is high, generally watersaving 25% to 35%, an increase of
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