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irrigation
Characteristics of root growth in a fast-growing and high-yield poplar plantation under subsurface drip-irrigation
      
'I-214') were studied under two contrasting conditions, subsurface drip-irrigation (SDI) and normal irrigation (CK), on the sandy soil of Chaobai River, Beijing.
      
The Dabieshan District is a main ecological area with a function of soil and water conservation where seven large reservoirs and irrigation systems of the Pishihang are distributed.
      
Spraying wheat seedlings with these extracts, in contrast to the irrigation of soil, markedly diminished infection in plants with powdery mildew.
      
Since infiltration arises as a result of irrigation or input from atmospheric water, it actually acts in certain seasons of the year and not all year long.
      
Distribution of moisture around a perforated tube used in subsurface irrigation
      
One of the possible and effective methods of irrigation is to feed water to the earth by means of perforated tubes under the surface of the ground.
      
In the design of systems of subsurface irrigation, one frequently uses empirical dependences that describe the process of moisture transfer approximately [1].
      
Calculation of nonstationary transport of moisture for drip and underground irrigation
      
Nonstationary transport of moisture in the case of drip and underground irrigation is considered.
      
Seepage-limitation optimization of the shape of an irrigation channel by the inverse boundary-value problem method
      
A study is made of the problem of finding the optimal shape of the section of an irrigation channel from the point of view of minimizing the seepage loss; the inverse boundary-value problem method [1] is used.
      
Problems of flow through porous media in which irrigation and drainage are simultaneously taken into account are very often encountered in connection with reclamation projects in arid zones.
      
This may be the result of a nonuniform irrigation rate distribution.
      
If the irrigation is uniform, the surface layer of soil is nonuniformly moistened: maximum saturation, often supersaturation, occurs midway between the drains, while over the drains the soil is practically dry.
      
Some cases of unsteady flow in porous media associated with irrigation
      
The results of an earlier study [1] are used to consider the motion of underground water flowing from an irrigation channel.
      
The surface of the ground flow usually has an uneven shape, since in some sections there is stripwise irrigation, while at others evaporation may occur or rain may fall.
      
Seepage from shallow channels and irrigation furrows
      
A uniform method of solution in which the solution of the problem of seepage from an irrigation furrow can be obtained from the solution for a broad channel is given.
      
 

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