نتایج جستجو برای: 20 cm in soil layer in totally

تعداد نتایج: 17154190  

ژورنال: علوم آب و خاک 2004
مهران هودجی, , احمد جلالیان, ,

Soil pollution and accumulation of heavy metals in crops in industrial areas are the most important bioenvironmental problems that threaten the life of plants, animals and humans. The objective of this study was to determine Ni, Mn and Cd distribution in soil and crops shoots around the Mobarakeh Steel Plant. In this study, we separated 50 zones based on soil utility maps taking into considerat...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده منابع طبیعی و علوم دریایی 1388

this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...

H. ANTOUN H. KHEYRODIN

The objective of this work was to study the effects of tillage and liquid manure applications on some physical and chemical properties as well as on the carbon and nitrogen mineralization potential of a meadow soil. Our results indicated that tillage and manure applications had no effect on the concentration of Cu, Mn, total N and organic C in 0-15 cm layer of soil after 15 years of treatment. ...

عباس همت, , محمدرضا مصدقی, , محمدعلی حاج‌عباسی, ,

Soil tilth is crucial to seedling emergence, plant growth, and crop yield. Soil tilth of unstable soil is very susceptible to change. Internal forces originating from matric suction can change soil physical properties. A laboratory study was conducted on pots of a surface silty clay loam soil of Khomeinishahr series (fine-loamy, mixed, thermic Typic Haplargids, USDA), located in Research Farm o...

ژورنال: علوم آب و خاک 2003
عباس همت, , محمدرضا مصدقی, , محمدعلی حاج‌عباسی, ,

Soil tilth is crucial to seedling emergence, plant growth, and crop yield. Soil tilth of unstable soil is very susceptible to change. Internal forces originating from matric suction can change soil physical properties. A laboratory study was conducted on pots of a surface silty clay loam soil of Khomeinishahr series (fine-loamy, mixed, thermic Typic Haplargids, USDA), located in Research Farm o...

Journal: :پژوهش های خاک 0
ملیحه کرمی کارشناسی ارشد آبیاری و زهکشی، دانشگاه شهید چمران معصومه فراستی استادیار گروه مهندسی آب، دانشکده کشاورزی، دانشگاه رازی کرمانشاه رامین ملکی کارشناسی ارشد آبیاری و زهکشی، دانشکده کشاورزی، دانشگاه رازی کرمانشاه

proper management of saline soils needs adequate information about the amount and salt distribution in the root zone. irrigation is one of the factors that control the distribution of salt. this study investigated soil leaching simulation by using hydrus2d software based on the evaporation of soil surface of a land without plant located at shahid chamran university, ahwaz, iran. samples were ta...

Journal: :journal of agricultural science and technology 0
l. b. silvestro laboratory of functional biology and biotechnology (biolab-inbiotec-conicet-cic), national university of the center of the province of buenos aires, argentina. f. biganzoli department of quantitative methods and information systems, faculty of agronomy, university of buenos aires, argentina. h. forjn barrow-inta experimental station, tres arroyos, province of buenos aires, argentina. a. albanesi chair in microbiology and ecology, agricultural faya national university of santiago del estero, argentina. a. m. arambarri spegazzini institute, fcnym, national university of la plata, argentina. l. manso barrow-inta experimental station, tres arroyos, province of buenos aires, argentina. m. v. moreno

zero tillage practices have a direct effect on soil microbial communities modifying soil productivity and sustainability. the crop sequences used can change the aforementioned properties, too. in this study, we evaluated the effect of crop sequences under zero tillage management on soil biological and chemical properties including vertical distribution of soil organic carbon, soil basal respira...

2014
Yidong Wang Zhong-Liang Wang Xiaoping Feng Changcheng Guo Qing Chen

Over the past six decades, coastal wetlands in China have experienced rapid and extensive agricultural reclamation. In the context of saline conditions, long-term effect of cultivation after reclamation on soil chemical properties has not been well understood. We studied this issue using a case of approximately 60-years cultivation of a coastal saline marsh in Bohai Rim, northern China. The res...

2015
Xinbing Wang Baoyuan Zhou Xuefang Sun Yang Yue Wei Ma Ming Zhao Jin-Song Zhang

The spatial distribution of the root system through the soil profile has an impact on moisture and nutrient uptake by plants, affecting growth and productivity. The spatial distribution of the roots, soil moisture, and fertility are affected by tillage practices. The combination of high soil density and the presence of a soil plow pan typically impede the growth of maize (Zea mays L.).We invest...

Rangelands cover approximately 85% of Kenya’s land mass and is a major resource for livestock farming with a considerable potential to mitigate climate change, yet these lands are stressed differently by various management. Our study aimed at determining the influence of grazing management systems (rotational, continuous and ungrazed) on soil organic carbon stocks in Yoani ranch located in the ...

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