نتایج جستجو برای: 30 cm rototiller parameters such as soil bulk density

تعداد نتایج: 6809907  

Journal: :آب و خاک 0
فاطمه مسکینی ویشکائی محمود شعبانپور شهرستانی ناصر دوات گر

abstract the saturated hydraulic conductivity (ks) is an important physical property of soil. the direct measurement of this property in soils is a difficult and time consuming process. pedotransfer functions (ptfs) provide an alternative by estimating soil parameters from more readily available soil data. the objective of this study is to determine effective factors on soil hydraulic conductiv...

Ali Ashraf Jafari Hossein Arzani Mohammad Jafari Sedigheh Zare Kia Seyyed Akbar Javadi

This study aims to assess the effect of grazing intensity on vegetation structure, soil nutrient concentrations and soil physical properties. The study was carried out in steppe rangelands of Saveh, Markazi province, Iran. Four sites with four grazing intensities including very high, high, moderate and non-grazed with the same ecological conditions were selected. To study various vegetation and...

Journal: :مدیریت آب و آبیاری 0
میثم رمضانی دانشجوی کارشناسی ارشد، گروه مهندسی آبیاری و آبادانی، دانشکده آب و خاک، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران بهزاد قنبریان علویجه دانشجوی دکتری آبیاری و زهکشی، گروه مهندسی آبیاری و آبادانی، دانشکده آب و خاک، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران عبدالمجید لیاقت استاد گروه مهندسی آبیاری و آبادانی، دانشکده آب و خاک، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران شکوفه صالحی خشکرودی دانش آموخته کارشناسی، گروه مهندسی آبیاری و زهکشی، پردیس ابوریحان، دانشگاه تهران

soil moisture retention curve is one of the soil hydraulic prosperities which its direct measurement is time consuming and expensive. therefore, indirect methods such as developing pedotransfer functions have been used to predict this characteristic from soil readily available or easily measurable data. in this study, multiple linear regression method was used to develop point pedotransfer func...

Journal: :ماشین های کشاورزی 0
جبرائیل تقی نژاد ارژنگ جوادی

this study carried out to evaluate the effect of different tillage systems on rapeseed yield (hayola 401) planted in corn residues. this experiment was done in moghan region with clay soils during 2009-2012. different seedbed preparation methods include mt: moldboard + disk tillage (conventional tillage was included), sct: stem crusher + chisel + disk tandem harrow, stt: stem crusher + double-d...

ژورنال: علوم آب و خاک 2014

Water management in cracked paddy soils is an important issue in rice cultivation. In order to study organic matter and zeolite effect and their interaction on moisture conditions and hydraulic and physical properties of paddy soils, the organic matter (rice straw) at four levels (0, 8, 16 and 24 tons per hectare), zeolite at four levels (0, 0.5, 1 and 1.5 percent ), and also moisture stages o...

ژورنال: علوم آب و خاک 2008
بسالت پور, اصغر , حاج عباسی, محمد علی , مللی, احمدرضا ,

  Applying of intensive cultivation especially in marginal and sensitive regions, after conversion of rangelands to cropland farms, commonly causes reduction in soil quality, and thus an increase in soil degradation, erosion and runoff. This study was conducted to evaluate the land use change effects on some soil physical and chemical properties such as mean weight diameter (MWD), soil organic ...

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...

ژورنال: علوم آب و خاک 2018

Soil quality is the permanent soil ability to function as a live system within ecosystem under different land uses. Investigating the impact of land use type on soil quality indicators could help to distinguish sustainable managements and therefore, to inhibit soil degradation. In order to evaluate the effect of different land uses on soil quality indicators, a research based on a randomized co...

2016
Tae Kyung Yoon Kyung Won Seo Gwan Soo Park Yeong Mo Son Yowhan Son Francisco Escobedo Stephen John Livesley Justin Morgenroth

Quantifying and managing carbon (C) storage in urban green space (UGS) soils is associated with the ecosystem services necessary for human well-being and the national C inventory report of the Intergovernmental Panel on Climate Change (IPCC). Here, the soil C stocks at 30-cm depths in different types of UGS’s (roadside, park, school forest, and riverside) were studied in three major South Korea...

ژورنال: علوم آب و خاک 2012
روح اله رضایی ارشد, , علیرضا جعفرنژادی, , غلامعباس صیاد, , مسعود مظلوم, , مهدی شرفا, ,

Direct measurement of soil hydraulic characteristics is costly and time-consuming. Also, the method is partly unreliable due to soil heterogeneity and laboratory errors. Instead, soil hydraulic characteristics can be predicted using readily available data such as soil texture and bulk density using pedotransfer functions (PTFs). Artificial neural networks (ANNs) and statistical regression are t...

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