灌溉

Ogallala water has enabled the High Plains region to supply significant amounts of the cotton, sorghum, wheat, and corn grown in the United States.

奥加拉拉蓄水层支撑了北美大平原地区美国棉花、高粱、小麦、玉米的灌溉需求。

The amount of acreage supported by the Ogallala in six states fell from its peak in 1978 by nearly 20 percent in less than a decade; despite efforts to limit use of Ogallala water, substantial withdrawals continue.

不到十年，美国六个州內靠奥加拉拉蓄水层维持灌溉的农田英亩数，比1978年的最大值下降了近20%。尽管各州努力限制用量，该蓄水层的储量仍大幅减少。

The most dramatic example is the Ogallala aquifer,the largest underground water source in the world.this enormous reserve runs through the agriculturally critical high plains states,from south Dakota to central texas.over-pumping for irragation has drained some parts of the aquifer dry and persistent regional drought has stifled refill by underground streams.

过多地采集地下水用于灌溉已经使地下水层的一些地方干枯，而且持续的区域性干旱也使地下河不能补充地下水层。

The coefficient under the water treatment with 80% of FC as the bottom line of irrigation was -0.88 and showed that the soil water content was overabundant to winter wheat.

0.88，表明水分条件对产量存在负面影响；全生育期无灌溉的处理产量对水分条件的反应系数为0.99。

NO3--N pollution in drinking water at the depth of 20 m is serious with common and serious overproof rates of 39.3% and 7.1% respectively. NO3--N content in irrigation water for farmland and greenhouse at the depth of 40 m is 7.4 mg·L-1 and 9.6 mg·L-1 with respective common overproof rates of 25.0% and 37.5%, and zero serious overproof rate.

设施蔬菜栽培区表层地下水(地下饮用水， 20 m)受硝态氮污染严重，超标率和严重超标率为39.3%和7.1%；而深层地下水(农田和大棚灌溉水， 40 m)硝态氮含量7.4 mg·L-1和9.6 mg·L-1，超标率分别为25.0%和37.5%，无严重超标水样。

NO3(superscript -)-N pollution in drinking water at the depth of 20 m is serious with common and serious overproof rates of 39.3% and 7.1% respectively. NO3(superscritp -)-N content in irrigation water for farmland and greenhouse at the depth of 40 m is 7.4 mgL^(-1) and 9.6 mgL^(-1) with respective common overproof rates of 25.0% and 37.5%, and zero serious overproof rate.

设施蔬菜栽培区表层地下水（地下饮用水，20m）受硝态氮污染严重，超标率和严重超标率为39.3%和7.1%；而深层地下水（农田和大棚灌溉水，40m）硝态氮含量7.4mgL^(-1)和9.6mgL^(-1)，超标率分别为25.0%和37.5%，无严重超标水样。

The volume of phreatic water suitable for irrigation increases and the extent of desalinized field remarkably expanded.

银川平原得益于其东缘的过境黄河提供的丰富水源，从秦汉时代至今引黄灌溉已经历了两千多年的历史。

From the zoning chart we know sodium adsorption ratios are less than 8 and the water is quite safe. So phreatic groundwater of this region can be used for irrigation only from the value of sodium adsorption ratio.

从分区图上看出研究区的钠吸附比值A均小于8，属于相当安全的水，故单从钠吸附比值评价来看该地区的潜水是可以被用来灌溉的。

The evolution of salinity content in soil and phreatic water in Qingtongxia irrigation area, Ningxia Atonomous Region, China, was analyzed according to the monitoring data in 40 years.

银川平原得益于其东缘的过境黄河提供的丰富水源，从秦汉时代至今引黄灌溉已经历了两千多年的历史。

The results show that buried depth of phreatic water levels has a very important influence on the agricultural environment and transformation between soil water and groundwater.

试验方法与试验条件概述在昌吉均衡试验场选用天山北麓平原有代表性的冬小麦和玉米两种主要作物，人为控制地下水位，模拟不同潜水埋深条件下的种植试验，土壤条件和灌溉制度与当地基本保持一致。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。