Due to no direct irrigation cost in Self-flowing irrigation Zone along Yellow River, the efficiency of water use is also lowest.

沿黄自流灌区由于没有直接灌溉成本，其用水效率也是最低的。

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The results indicate that the nitrate-N leakage loss under the root zone caused by fertilizer irrigation could creat the pollution of shallow groundwater in Tangshan agricultural area.

计算结果表明，唐山农业区灌溉施肥引起根区以下硝态氮渗漏损失可造成浅层地下水的污染。

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Know how much water is needed to refill the root zone during irrigation and plan fertigation accordingly.

要了解在灌溉时灌满根区需要多少水，并据此来制定灌溉施肥计划。

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Finding a Mediterranean climate characterised by warm, dry summers and cool, wet winters, they successfully planted their own vines and have kept the valley dry grown (ie no irrigation zone) for more than 150 years.

BBC: Beyond the vines in Australia��s Barossa Valley

This type of zone irrigation means less water is wasted on plants that don't really need it.

CNN: X-rated yards save the environment