The surface irrigation occupies 95% of the total irrigated area, the border irrigation is the main method in surface irrigation, so there is much importance in researching on the border irrigation water-saving means.

地面灌溉占我國(guó)灌溉總面積的95％欧美色图亚洲图片，其中畦灌又是地面灌溉的主要方式，研究畦灌中的節(jié)水措施對(duì)于發(fā)展農(nóng)業(yè)節(jié)水具有重要意義免费啪啪黄色视频。

China is a large country of irrigated agriculture, in which the shortage of water resources is very serious. Due to the underdevelopment of economy, traditional irrigation such as border and furrow irrigation is still taken as the dominant way in farmland irrigation, which leads to the great waste of water resources.

我國(guó)是一個(gè)灌溉農(nóng)業(yè)大國(guó)啊轻点啊视频，水資源緊缺問題十分嚴(yán)重，但是由于經(jīng)濟(jì)欠發(fā)達(dá)欧美一级强视频网址，農(nóng)田灌溉仍以傳統(tǒng)的畦灌黄色视频在线观看地址、溝灌等地面灌溉技術(shù)為主，水資源浪費(fèi)現(xiàn)象還比較嚴(yán)重中国jizz，因此免费aⅴ无遮拦网站观看，開展節(jié)水灌溉的研究勢(shì)在必行。

The article is used finite yuan the method builds his to emulate analytic model, the construction of imitate bridge, study successive bridge bracket is irrigated build construction each operating mode, analyse what each operating mode issues bracket to be out of shape reach stability, ordinal come the design of bracket of test and verify is reliable, provide reference for bridge construction.

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In 1 irrigation time and 2 irrigation times treatments, soil salt content decreased by 11.7%, and soil salt content increased by 12.6% in 3-4 irrigation times treatments. 2 After irrigation, the mean reduction of soil bulk density was 6.5%, and the mean increment of soil total porosity was 18.1%. With the irrigation frequency increasing, soil density was decreased and soil total porosity was increased. 3 Soil infiltration course of reed field irrigated by wastewater fitted Horton infiltration model well. After wastewater irrigation, the first infiltration rate decreased, but the stable infiltration rate promoted with the wastewater irrigation frequency increasing. 4 Soil water-holding capacity was increased by wastewater irrigation. The maximum water-holding capacity in capillary was 90.15 mm in the treatment of irrigation 3 irrigations, and the maximum water-holding capacity in non-capillary was 4.15 mm in treatment of 4 irrigations.

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To control the ground-water table on irrigated lands is vitally important in arid and semi-arid regions. In order to determine the standard of water table control, considerable attentions were paid to the "critical depth"(or "safe depth") of ground-water table. The salts accumulate in the top soil if the water table is not deeper than this depth. The conditions that the salts accumulate in any layer of the soil owing to the movement of soil moisture are:(1) the supplement of soil moisture from neighboring...

本文分析了地下水補(bǔ)給情況下土壤水分的形態(tài)和不同形態(tài)的水分在土壤中運(yùn)行和蒸發(fā)的一些特點(diǎn)韩国无码视频免费观看，論証了毛管水聯(lián)系破裂含水率等土壤水分形態(tài)指標(biāo)與土壤水分運(yùn)動(dòng)和土壤積鹽狀況的關(guān)系，探討了次生鹽堿化發(fā)生的地下水臨界條件2021国内自拍偷拍，提出了地下水臨界深度的確定方法色惰中老年妇女毛片视频，并且對(duì)現(xiàn)有的臨界深度的確定方法進(jìn)行了討論與比較。

A 47-year-old female, who had 3 large pet dogs, presented with right foot cellulites and a discharging sinus at first web. During debridement at the operating room, a few dog hairs were irrigated out. The wound and infection improved thereafter.

一位47歲婦女因右腳蜂窩織炎及第一趾蹼流膿來診国产精品无码你懂的，在手術(shù)室清創(chuàng)及沖洗時(shí)国产精品无码久久久久，從傷口里找到數(shù)根毛與病患飼養(yǎng)的三只大丹狗相同。

The varieties of wetland found here in Hong Kong are associated with inter-tidal mudflats, fishponds, sea-grass beds, coral reefs, rocky seashores, rivers and streams, freshwater marshes, irrigated agricultural land and reservoirs.

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In Hong Kong, many different types of wetland could be found, for instance, inter-tidal mudflat, fishponds, sea-grass bed, coral reef, rocky seashore, river and stream, freshwater marsh, irrigated agriculture land, and reservoir.

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The will and character is not only the fruit irrigated by Huxiang culture, but also the embodiment of Lushu Spirit.

這種人格亚洲国模大胆私拍久久av、志是湖湘文化長(zhǎng)期熏染的結(jié)果，也是魯迅精神感召丁玲的具體表現(xiàn)精品国产欧美在线观看不卡。

This article has selected from 1995 - 2007 13 year data, since has been our country stable agricultural policy data, reliable, obtains the grain yield and the farm investments, the crops sown area, the farm price, the primary industry working population, the countryside electricity consumption, the agricultural chemical fertilizer employment quantity, the disaster area, the yield per unit of area, the effective irrigated area finally through the empirical analysis, based on this and gives the comment and the measure.

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