- 行业: Agriculture
- Number of terms: 29629
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A measure of the degree of acidity or alkalinity of a soil or solution. A pH of 7.0 is neutral, below 7.0 is acidic, and above 7.0 is alkaline or basic. It is the negative logarithm of the hydrogen ion concentration of a soil or solution.
Industry:Agriculture
The total area from which a single river collects surface water runoff; the catchment or drainage area of a river system.
Industry:Agriculture
A marked deterioration in the hydrological behavior of a river system which reduces the potential of land and water by causing a water flow of inferior quality, quantity and timing.
Industry:Agriculture
Impeded drainage; or soil saturated with water but not necessarily with standing water.
Industry:Agriculture
A field which continuously has standing water and cannot be drained. The water level may not be deep.
Industry:Agriculture
1). Expressed in terms of dry matter or harvested portion of the crop produced per unit of water consumed. 2). Ratio of the water used for evapotranspiration, seepage, and percolation to the sum of rainfall and irrigation supply.
Industry:Agriculture
The upper surface of ground water and the level below it where the soil is saturated with water.
Industry:Agriculture
To control the amount and depth of water in the ricefield during the required time necessary for crop growth.
Industry:Agriculture
