نتایج جستجو برای: saline lands has decreased while
تعداد نتایج: 3605779 فیلتر نتایج به سال:
sange siyah dam is located two kilometers down the kabod khani village. the environ of ghorrve city in kurdestan province. this is an clay core dam. in this dam instrumentation is performed in three section and consist of electrical piezometers, total pressure cells, settlement cells and so on. the main objective of instrumentation is to control the behavior of dam body and foundation, end else...
Abstract Land salinization is a major obstacle to the sustainable development of agriculture in arid regions. The demand for food, fiber, fuel and fresh water has increased in the recent decades, particularly in developing nations, due to alarming rise in population. As fresh water resources and productive lands for crop production are limited, new strategies for the sustainable utilization of ...
while performance-based language assessment has led to an increased authenticity and content validity in the practice of writing assessment, the reliability of ratings has become a major issue. research findings have shown different reactions by native english speaker (nes) and non-native english speaker (nns) teachers to students’ writings. the focus of this study is on investigating whether i...
recent studies in scientific education as well as foreign and second language instruction suggest that thinking has rarely been an integral part of education and training in classroom. some scholars decried the lack of emphasis on thinking in the institutes and schools. they noted that memorization and drills were rewarded,while inquiry, reflection, and consideration of alternatives were frowne...
Compared to surface water, groundwater resources are the primary source of water supply in arid and semi-arid regions of Iran, hence the importance of the management of these resources . In this regard, we assessed the effects of landuse changes on the qualitative and quantitative status of groundwater resources in Eshtehard region, Iran. Through processing and analyzing the satellite images, ...
using low quality water on agricultural lands in south of tehran has increased the risk of soil salinity and created problems for some agricultural crops. this study was carried out to determine of soil salinity distribution and to produce salinity map. the mapping of salinity can also identify the saline and non-saline regions that are very effective for land management and choosing kind of cr...
Recent observations of Asian dust storms show an eastern expansion of the source area to degraded lands, where dust emissions have been little studied. The dust concentrations over the saline land of the western Songnen Plain (SSL), Northeastern China, are circumstantially higher than those from the northwestern Chinese deserts. These concentrations are sensitive to the surface soil conditions ...
The area under pulse production has decreased continuously for the last 10 years in Bangladesh. With the expansion of irrigation facilities, the area allocated to production of cereal crops has increased significantly, while pulses have been pushed to marginal lands of low productivity. Additional production of pulses can be achieved by (1) increasing productivity through improved varieties, (2...
abstract this research is about a longitudinal case study of english morpheme acquisition by a persian speaking child l2 learner of english (2 .9-3).the goal of this research has been discovery of the child ‘s ability in acquiring of english morphemes in a persian context while only one person (the child’ s father)has been talking to her.this child has also been exposed to english languag...
The article describes a new method to assess the response-ability of 4 chili pepper F1 species: Chanh Nong, Phong, Mui Ten Do, and EV258 based on different concentrations NaCl or CaCl2 (0, 50, 100, 200, 300 mM). This experiment was conducted in invitro greenhouse conditions within 12 weeks by investigated growth developmental parameters. Our showed that salt stress caused decrease all indicator...
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