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in BRITISH COLUMBIA CHAPTER OF UNION PARTY OF CANADA by (44.4k points)
In this paper, the salt balance of soils depend on irrigation and high evaporation was tried to explain in terms of agricultural proper soil and water management.Crop production is limited by water shortage which is caused insufficient irrigation methods and annual high evaporation.Higher quality crop production depend on reducing environmental impacts such as surface runoff, deep percolation, net <a href="http://www.targetmol.com/compound/Lansoprazole">Targetmol's Lansoprazole</a> radition, wind speed, high evaporation and air temperature and also soil types, soil water content, hydrological properties and soil salinity.The soil water is considered as a major of factor affecting evaporation directly.In fact, the surface temperature may be considered as the indirect factor on soil evaporation.The   evaporation of soil was in the first stage, this period the soil evaporation is major affected by the meteorological factors.After than, when the evaporation come into the second stage, this period the soil evaporation is mainly controlled by soilself water content. This event will be irrigation methods between and days periods.In order to maintain the sustainable development of irrigated agriculture in arid region, an accurate knowledge of water loss from soil is necessary.In general, the main routes of soil water loss are evapoaration and transpiration.The soil evaporation and crop transpiration are often considered together as the evapotranspiration. The saline soils are considerably resulted from the irrigated water containing salinity and the high evaporation in the agricultural arid soils.And also, the evaporation not only makes water loss but also may induce secondary salinization in arid and semiarid region. A soil salinity distribution that reflected the water application using irrigation methods.For this, feasible and scientific methods of irrigation are so important for agricultural activities.All of these can help reduce to effect of high evaporation and salinization on the agricultural soils.There are several studies on the effects of irrigation methods relation the salinization and high evaporation on soils.Salinity is an increasingly expansive problem for agriculture, as it reduces growth and development of saltsensitive plants. Generally, soil salinity increased towards the furrow ridges and decreased towards the drip irrigation.Because of the nature of the drip irrigation technique, the cropped area is not completely wetted, so the water requirement is lower than for surface methods where there is more surface evaporation.On the other hand, water use efficiency under drip irrigation is higher than that of furrow or wild irrigation, which is very expected because of the water saving feature of the drip method.Drip irrigation is a form of irrigation that saves water and fertilizer by allowing water to drip slowly to the roots of many different plants, either onto the soil surface or directly onto the root zone.Genarally, farmers prefer to instead of surface irrigation for various reasons, often including concern about minimizing evaporation and also using limited amount of water.The variations of soil salinity under the drip irrigation for treatments before and after irrigation seasons were shown different distribution depend on evaporation.This stduy was explained sufficient to leach out the salts which accumulate during drip irrigation and the soil salinity threshold for the crops growing in agricultural areas.Water application efficiency is high if managed correctly and moisture within the root zone can be maintained at field capacity under the drip irrigation.

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