نتایج جستجو برای: soil mapping

تعداد نتایج: 375443  

2011
M. Kucharski J. Sadowski

The aim of our research was to determine the influence of the soil type and adjuvants on the dynamics of ethofumesate degradation in soil. Samples of two types of soil were placed in growth chambers. Ethofumesate was applied at a rate of 800 g·ha, alone and in mixture with adjuvant based on methylated crop oil and surfactant adjuvant. Residues of ethofumesate were determined using high-performa...

2015
Tomislav Hengl Gerard B. M. Heuvelink Bas Kempen Johan G. B. Leenaars Markus G. Walsh Keith D. Shepherd Andrew Sila Robert A. MacMillan Jorge Mendes de Jesus Lulseged Tamene Jérôme E. Tondoh

80% of arable land in Africa has low soil fertility and suffers from physical soil problems. Additionally, significant amounts of nutrients are lost every year due to unsustainable soil management practices. This is partially the result of insufficient use of soil management knowledge. To help bridge the soil information gap in Africa, the Africa Soil Information Service (AfSIS) project was est...

Journal: :آب و خاک 0
اسفندیارپور بروجنی اسفندیارپور بروجنی تومانیان تومانیان صالحی صالحی محمدی محمدی

abstract geopedology is a systematic approach of geomorphic analysis for soil mapping which focuses the field operation mainly on sample area. the purpose of this study is to determine the credibility of generalization of the results of geopedological approach for similar landforms in the borujen region, using diversity and similarity indices in a soil taxonomic hierarchical structure. after a ...

Journal: :مرتع و آبخیزداری 0
طیبه مصباح زاده استادیار گروه احیای مناطق خشک و کوهستانی، دانشکدة منابع طبیعی، دانشگاه تهران حسن احمدی هیات علمی فریدون سرمدیان هیات علمی محمد جعفری هیات علمی حسین آذرنیوند هیات علمی محمد زارع چاهوکی هیات علمی مریم رستمی

this research was done in order to submit a model for salinity map made with tm satellite data and salinity values in a buienzahra. the necessary processings such as principal component analysis and producing of different indices was done on the main bands. the 38 soil samples using random sampling (with 10×10 km dimension) from different horizons were designed and performed on the study area. ...

Journal: :Environment international 2005
Nina Jørgensen Jens Laursen Arturs Viksna Niels Pind Peter E Holm

The distribution of major and trace elements was systematically investigated by use of energy dispersive X-ray fluorescence spectrometry (EDXRF) on a former horticultural soil. The purpose of the study was to combine mapping of soil element concentration levels with multivariate statistics for characterisation of soil metal pollution in relation to previous and present land use. A 1-ha study si...

2012
Xiao-Lin Sun Yu-Guo Zhao Hui-Li Wang Lin Yang Cheng-Zhi Qin A-Xing Zhu Gan-Lin Zhang Tao Pei Bao-Lin Li

In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: a b s t r a c t a r t i c l e i n f o Keywords: Fuzzy c-means clustering Fuzzy validity function Digital soil mapping Sensit...

2017
Gerald Forkuor Ozias K L Hounkpatin Gerhard Welp Michael Thiel

Accurate and detailed spatial soil information is essential for environmental modelling, risk assessment and decision making. The use of Remote Sensing data as secondary sources of information in digital soil mapping has been found to be cost effective and less time consuming compared to traditional soil mapping approaches. But the potentials of Remote Sensing data in improving knowledge of loc...

2013
Michele Duarte de Menezes Sérgio Henrique Godinho Silva Phillip Ray Owens Nilton Curi

In Brazil, soil surveys in more detailed scale are still scarce and necessary to more adequately support the decision makers for planning soil and environment activities in small areas. Hence, this review addresses some digital soil mapping techniques that enable faster production of soil surveys, beyond fitting continuous spatial distribution of soil properties into discrete soil categories, i...

2015
De-Cai Wang Gan-Lin Zhang Ming-Song Zhao Xian-Zhang Pan Yu-Guo Zhao De-Cheng Li Bob Macmillan Jingdong Mao

Numerous studies have investigated the direct retrieval of soil properties, including soil texture, using remotely sensed images. However, few have considered how soil properties influence dynamic changes in remote images or how soil processes affect the characteristics of the spectrum. This study investigated a new method for mapping regional soil texture based on the hypothesis that the rate ...

2015
Justin George

Hyperspectral remote sensing is widely used for analyzing and estimating the severity of soil salinity in arid and semi-arid regions, throughout the world. The present study is an attempt to map the various soil salinity severity classes using different hyperspectral indices generated using EO-1 Hyperion data and Support Vector Machine (SVM) method, in the Mathura region of Indo-Gangetic plain ...

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