Therefore, we need to develop modern irrigation farming and modern dry farming characteristic of water saving and high efficiency.

為此ⅴ黄片視頻，要實(shí)施節(jié)水高效的現(xiàn)代灌溉農(nóng)業(yè)和現(xiàn)代旱作農(nóng)業(yè)国产极品福利精品小视频。

Dry farming ,irrigation farming,and the cattle and sheep herding are the main

旱地農(nóng)業(yè)18禁一级国产人人肏，灌溉農(nóng)業(yè)和牛羊牧業(yè)是美國西部大平原地區(qū)的主要活動亚洲欧洲精品污网站在线观看。

According to the present situation of dry farming research and practice, it is thought that in order to increase the dry farming yield, the water-retaining materialmust be scientifically applied to bring it into fullplay.

通過對旱地農(nóng)業(yè)研究和實(shí)踐現(xiàn)狀的分析，認(rèn)為高分子保水材料的科學(xué)應(yīng)用和充分發(fā)揮其效能天天色天天日天天干，是解決旱地農(nóng)業(yè)增產(chǎn)問題的重要發(fā)展方向人人弄人人玩人人搡。

Dry farming ,irrigation farming, and the cattle and sheep herding are the main activities of the Great Plains of the American West.

旱地農(nóng)業(yè)天天干网，灌溉農(nóng)業(yè)和牛羊牧業(yè)是美國西部大平原地區(qū)的主要活動国内外免费激情在线视频。

Dry farming ,irrigation farming,and the cattle and sheep herdingare the main cativities of the Great Plains of the American West.

旱地農(nóng)業(yè)，灌溉農(nóng)業(yè)和牛羊牧業(yè)是美國西部大平原地區(qū)的主要活動亚洲产国偷v产偷v自拍小说。

Farming in the Office of the rapid mobilization, and vigorously promote a two-furrow mainly dry farming techniques.

省農(nóng)牧廳迅速組織動員FreeXXXX性HD中国性，大力推廣以雙壟溝為主的旱作農(nóng)業(yè)技術(shù)。

Dry farming, irrigation farming, and the cattle and sheep herding are the main cativities of the Great Plains of the American West.

旱地農(nóng)業(yè)插逼吃奶头69黄色视频，灌溉農(nóng)業(yè)和牛羊牧業(yè)是美國西部大平原的主要活動亚洲国产精品自拍线路。

Dry farming; dryland farming A system of producing crops in arid and semiarid regions without the use of irrigation.

旱地耕作法指一種在干旱或半干旱土地上不使用灌溉方法生產(chǎn)作物的耕作制度。

Dry farming ,irrigation farming,and the cattle and sheep herding are the main cati vities of the Great Plains of the American West.

旱地農(nóng)業(yè)六月婷婷,激情九九，灌溉農(nóng)業(yè)和牛羊牧業(yè)是美國西部大平原地區(qū)的主要活動人人做人人干人人操。

Because of the regional difference of soil and climatic conditions, the division of 4 stages of soil moisture circulation is not all the same between different areas; the soil moisture dynamics between different dry farming areas in the Yellow River Basin is contrasted in this report. The results indicate that soil moisture increases gradually from dry semi-arid area to semi-arid area, dry semi-humid area and semi-humid area, and the high value district generally appears during soil moisture resuming period in rainy season or soil melting period. While the low value district appears at the stage of fast evaporation in spring or slow evaporation in autumn; in views of vertical changes of soil moisture, it is showed that the variation range of upper lays is larger than that of lower among the different dry farming areas in the Yellow River Basin.

由于各區(qū)域之間土壤、氣候條件的差異九九精品国产72国产精品福利，各地土壤水分循環(huán)4個階段的劃分也不盡相同精品久久久无码中文字幕一丶；黃河流域不同旱作類型區(qū)土壤水分動態(tài)變化比較結(jié)果表明：就季節(jié)變化而言(來源：A70b0B0bC論文網(wǎng)www.abclunwen.com)，由半干旱偏旱區(qū)→半干旱區(qū)→半濕潤偏旱區(qū)→半濕潤區(qū)土壤水分含量呈逐漸增加的變化趨勢国产精品一级黄色av，而且高值區(qū)一般出現(xiàn)在雨季恢復(fù)階段或春季土壤融凍返漿時期欧美1300部呦交在线播放；而低值區(qū)均出現(xiàn)在春季大量蒸發(fā)階段或秋季緩慢蒸發(fā)階段；就垂直變化而言一区二区黄色网站在线观看，黃河流域不同旱作類型區(qū)土壤水分垂直變化的趨勢均表現(xiàn)為上層變化幅度較下層大91久久精品国产一区二区蜜月。