The mathematics model for the relationships among soil available water content with soil texture, particle diameter and dosage of super absorbent ploymer(SAP) was deduced.
结果表明：土壤质地、保水剂用量对土壤有效水含量的影响达到极显著水平，而保水剂粒径对土壤有效水含量的影响不显著。
Soil available water capacity (AWC) plays an important role in the evaluation of drought resistance of soil, planning and managing water resources and conducting irrigation.
土壤有效含水量（AWC）是评价土壤抗旱性、水资源规划和管理以及指导灌溉的重要依据。
Though the wilting coefficient of soil tend to increase as water retaining agents increased, the amplitude was low, so the soil available water capacity augmented obviously.
土壤凋萎系数虽有增大趋势，但增幅很小，土壤有效水容量明显增大。
In soil-plant-atmosphere system, soil available water content, crop water consumption, and effective precipitation are the main factors in water balance equation of farmland.
在土壤-植物-大气系统中，土壤有效水分贮存量、作物耗水量和有效降水量是农田水分平衡的主要组成因子。
Some areas, because of their soil texture, topographical position, or distance from rivers or groundwater, have virtually no water available to plants, whereas others do.
有些地区由于土质、地形位置或与河流或地下水的距离，几乎没有水分能提供给植物，而另一些地区则有。
In some places it is indeed replenished quite quickly if rain or surface water is available and the geological and soil conditions are favourable.
确实，在一些雨水和地表水丰富并且地质和土壤环境理想的地方，地下含水层可以很快就得到补充。
Polluted water kills fish and other Marine life. Pollution of soil reduces the amount of land available for growing food.
被污染的水源会引起鱼类以及其他海洋生物的死亡，被污染的土壤会减少种植农作物的面积。
Worldwide food production requires around 30% of the total soil available, 20% of fossil fuel energy and a major part of the fresh water flow3.
世界粮食生产大致需要30%全球土地，20%化石能源和大部分的淡水流量。
The method of building soil water forecast model with neural network is available.
用神经网络建立土壤水分预测模型的方法是可行的。
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。
It increased plough layer soil water and available nutrients content.
大豆覆膜增加了土壤水分与速效养分含量。
The result shows that the high polymers VAM and PHM can not only enhance the water retention ability and the available water content, but also prevent the evaporation from the surface soil.
研究结果表明：高聚物不仅能提高土壤的持水力和增加土壤水对植物的有效性，而且还能抑制土壤水的蒸发。
The second is the process of water condensation determined by air vapor, soil surface temperature and the available energy of soil.
第二阶段是由近地面微气象条件决定的水分凝结过程，所吸收水量受空气水汽压、地面温度和地表可利用能量的影响。
The results show that the soil water conduction of the plantation was very poor and the available water content was very low during the growing season.
结果表明，在年生长期中，刺槐林地水分条件严酷、土壤有效水分少。
It was testified by pot test and cultivation experiment that applied boron to soil in this season could not be extracted fully by hot water, and this boron was available to crop growth in next season.
盆栽试验和培养实验都证明热水不能完全提取当季施入土壤中的硼，而这些硼在后季作物生长中继续发挥效果。
At last, a drought index model was developed by considering the water requirement of winter wheat and the available soil water content.
最后，根据冬小麦的需水规律和土壤有效水含量构造干旱指数模型。
The effects of forest fires on soil separate coefficients, porosity, saturated water-retaining capacity, available Mg, fine root significantly varied between the fire intensity.
火烧强度对上壤分散系数、孔隙度、饱和持水量、有效镁、细根系生物量的影响有显著差异。
Because soil evaporation was reduced obviously in the earlier stage of crop growth, available water was increased during flourishing stage of crops. So water use efficiency was increased.
农田秸秆覆盖后作物苗期棵间土壤蒸发明显减少，使旺盛生长期可利用水分增加，提高了水分的利用率。
ABSTRACT: Dry farming is a method that takes advantage of the water naturally available in the soil.
摘要：在某些干旱的产区，旱耕是其葡萄种植的一大特色。
The result showed that the available soil water quantity varied and was affected by precipitation apparently during a year.
结果表明，①土壤有效水量年内变化明显，受降水影响显著；
Water present in the soil and available for plant absorption.
缺水会影响植物的生长。
The accumulation of anti-gravity of soil pore water, soil water storage capacity is the maximum available for the plant to provide water.
土壤孔隙抗重力所蓄积的水，是土壤贮水能力的上限，为植物提供可使用的水。
The accumulation of anti-gravity of soil pore water, soil water storage capacity is the maximum available for the plant to provide water.
土壤孔隙抗重力所蓄积的水，是土壤贮水能力的上限，为植物提供可使用的水。
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