نتایج جستجو برای: easily available soil properties

تعداد نتایج: 1657671  

Fire can influence the stability of many natural habitats via changes in biological, chemical and physical properties of soil. The aim of the present study was to investigate the effects of fire on some chemical properties and nutrients availability in a rangeland soil. To perform this research, a fired area with a five-month history and a homogenized area close to it without fire were selected...

مجیدافیونی, , محمدرحیم بهره مند, , محمدعلی حاج عباسی, , یحیی رضایی نژاد, ,

A field experiment was conducted to investigate the effects of sewage sludge and of time lapse after sludge application on soil physical properties. Four sewage sludge treatments (0, 25, 50, and 100 ton/ha) in a complete randomized block design with three replications were applied and mixed to a depth of 20 cm. Wheat was planted and soil physical properties were measured 23, 85, 148, and 221 da...

Journal: Desert 2017
F. Ramazani H. Shekofteh,

Soil cation exchange capacity (CEC) is a parameter that represents soil fertility. Being difficult to measure, pedotransfer functions (PTFs) can be routinely applied for prediction of CEC by soil physicochemical properties that can be easily measured. This study developed the support vector regression (SVR) combined with genetic algorithm (GA) together with the adaptive network-based fuzzy infe...

2012
Fereydoon Sarmadian Ali Keshavarzi

Study of soil properties like field capacity (F.C.) and permanent wilting point (P.W.P.) play important roles in study of soil moisture retention curve. Although these parameters can be measured directly, their measurement is difficult and expensive. Pedotransfer functions (PTFs) provide an alternative by estimating soil parameters from more readily available soil data. In this investigation, 7...

Journal: :آب و خاک 0
یاسر استواری کامران عسگری حمیدرضا متقیان

introduction: estimation of cation exchange capacity (cec) with reliable soil properties can save time and cost. pedotransfer function (ptf) is a common method in estimating certain soil properties (e.g. cec) that has been wieldy used for many years. one of the common techniques that have been used to develop ptfs is multiple linear regressions. in this method, all easily obtained soil properti...

Journal: :مرتع و آبخیزداری 0
حمید محمدی ، حمیدرضا کریم زاده جمال الدین خواجه الدین

study of soil and plant relationships is nessesery for ecological- based and appropriate management. the objective of this study is to determine the influence of edaphic properties on haloxylon persicum growth and also, indentifing growth limiting soil properties for saxaul. the study was performed through the stratified random sampling and 3 sites were selected as follow: planted strong saxaul...

Journal: :Soil Science and Plant Nutrition 1984

ژورنال: علوم آب و خاک 2012
حمیدرضا فولادمند, , سحر هادی‌پور, ,

Soil water characteristic curve shows the relationship between soil water content and matric suction, which has an important role in water movement in the soil. The measurement of this curve is expensive and time-consuming in laboratory therefore, many methods have been proposed for its estimation including pedotransfer functions. By using the pedotransfer functions, soil water characteristic c...

Journal: :B-plus 2022

たくさんの情報を遠くまで運べる光通信技術の進歩により,スマートフォンなどで便利に情報をやりとりできる時代です.光通信はどのように行われているのか,そういった疑問に答えるために,発光ダイオードやレーザダイオードを光らせて,光に音を乗せて送ってみます.本稿では,手軽に入手できる光部品,電子部品で電子回路を組み立て作る光送信機と光受信機を紹介します.光無線通信,可視光通信,光ファイバ通信を体感できます.現実の光通信で使われている技術の系譜について文献等を引用しながら解説します.

جهانگرد محمدی, , فایز رئیسی گهرویی, ,

Knowledge of the spatial dependency of soil properties, sensitive to grazing systems, is important from an ecosystem protection point of view. In the current study, geostatistical methods and fractal concepts have been used in order to characterize the impact of long-term grazing exclusion on the spatial variability of some soil chemical parameters including organic matter, total nitrogen, avai...

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