soil available water

All the water retained in a soil is not equally available to plants.

保留在土壤中的全部水分对植物的有效性是不一致的.

Soil water not available for absorption by plants.

水浸泡的土壤,软而湿的土壤.

Soil available potassium content after treated by the root exudates of grain amaranth was higher than that treated by pure water. Under low potassium stress, the content of soil available potassium treated by the root exudates of K12 was higher than that treated by those of M9.

籽粒苋根系分泌物处理后的土壤速效钾含量均高于清水对照处理，富K基因型在低K胁迫时的根系分泌物对土壤K的活化作用明显大于一般基因型。

A more disturbing thought is that we may in the longer term be approaching the limits of our ability to exploit the natural resources required for food production – crude oil, cultivable land, soil fertility and available fresh water, to name a few.

一个更令人不安的想法是，长期而言，在开发利用粮食生产所需的自然资源方面，我们可能已接近能力极限。这些资源包括原油、可耕地、土壤肥力及可用淡水等等。

Because the evaporation is great more than rainfall, and the ground water is deep, soil water is always in the step of wane condition and the soil nutrient are also leanness and available nutrients are scantily, which makes the eco-environment of the plateau very fragile.

由于蒸发潜势远大于降雨量，而地下水埋藏又很深，致使土壤水分经常处于水分亏缺状态，加之水土流失严重，土壤贫瘠，基础肥力低，有效养分缺乏，生态环境十分恶劣。