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。
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。
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。
However, when irrigation application decreased by 25% the salt accumulation in root zone will not be obvious and the subsurface drainage flow will decrease by 31.4%.
现状灌溉用水量减少25%时，作物根区没有产生明显的积盐，地下排水量减少31.4%。
In recent years, the use of chemigation has become a method to apply pesticides directly to the root zone of plant through trickle irrigation systems.
利用滴灌系统施用农药可以将农药直接作用到植物根区，这是节水农业和生态农业中一种先进的灌溉施药方法。
Evapotranspiration, yield, production value, and soil moisture in root zone for 30 kinds of intercropping systems under different irrigation water application were studied in this paper.
对30余种间作套种组合种植作物的耗水量、产量、产值及其根区土壤含水量进行了分析研究。
In the condition of spring irrigation and concentrated rainfall, the soil desalinized in root zone, and the accumulated salt due to saline water irrigation can be leached;
在春季河灌和汛期集中降雨淋洗的条件下 ，作物根层土壤不积盐 ；
Tarim irrigation area is located in the warm-temperature zone with plenty of light, heat, soil and water resources which are favorable conditions for the development of agriculture.
本文根据土地生产潜力和人口承载力计算模型 ，确定在不同生活水平要求下塔里木灌区适当的人口规模 ，为塔里木灌区农业资源的合理适度开发提供参考依据。
Effect of partial root-zone irrigation on the photosynthesis, leaf area, dry mass accumulation and water use of sweet corn under two fertilization levels was studied in this paper.
研究了两种施肥水平条件下根区局部灌溉对甜玉米叶片光合、叶面积、干物质积累和水分利用的影响。
Effect of partial root-zone irrigation on the photosynthesis, leaf area, dry mass accumulation and water use of sweet corn under two fertilization levels was studied in this paper.
研究了两种施肥水平条件下根区局部灌溉对甜玉米叶片光合、叶面积、干物质积累和水分利用的影响。
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