نتایج جستجو برای: decomposition rate and effects on soil

تعداد نتایج: 18670666  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده ادبیات و زبانهای خارجی 1392

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...

ژورنال: علوم آب و خاک 2017

Soil water repellency can affect several soil properties such as aggregate stability. Soil texture and organic matter are two main internal factors responsible for the variability of soil water repellency. Major sources of organic matter in soil include plant residues, and exudates of plant roots and soil microorganisms. Tall fescue (Festuca arundinacea Schreb.) as an important cool-season pere...

2005
WILLIAM F. DEBUSK K. RAMESH REDDY

A field study was conducted in a nutrient-impacted marsh in Water Conservation Area 2A (WCA-2A) of the Everglades in southern Florida, USA, to evaluate early stages of plant litter (detritus) decomposition along a well-documented trophic gradient, and to determine the relative importance of environmental factors and substrate composition in governing decomposition rate. Vertically stratified de...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده اقتصاد 1391

reinsurance is widely recognized as an important instrument in the capital management of an insurance company as well as its risk management tool. this thesis is intended to determine premium rates for different types of reinsurance policies. also, given the fact that the reinsurance coverage of every company depends upon its reserves, so different types of reserves and the method of their calc...

Journal: :Applied and environmental microbiology 2013
Bo Sun Xiaoyue Wang Feng Wang Yuji Jiang Xue-Xian Zhang

Decomposition of plant residues is largely mediated by soil-dwelling microorganisms whose activities are influenced by both climate conditions and properties of the soil. However, a comprehensive understanding of their relative importance remains elusive, mainly because traditional methods, such as soil incubation and environmental surveys, have a limited ability to differentiate between the co...

Journal: :دانش آب و خاک 0
معصومه مهدذی زاده داﻧﺸﺠﻮی ﺳﺎﺑﻖ ﮐﺎرﺷﻨﺎﺳﯽ ارﺷﺪ ﮔﺮوه ﻋﻠﻮم و ﻣﻬﻨﺪﺳﯽ ﺰ عادل ریحانی تبار ﮔﺮوه ﻋﻠﻮم و ﻣﻬﻨﺪﺳﯽ خاک دانشگاه تبریز شاهین اوستان ﮔﺮوه ﻋﻠﻮم و ﻣﻬﻨﺪﺳﯽ خاک دانشگاه تبریز

it seems that the presence of soil organic matter (som) increases p availability to plants. this effect has commonly been ascribed as competition between the decomposition products of som and p for soil sorption sites resulting in p concentrations increase of soil solution. this study was carried out to obtain information about soil organic matter (som) influence on kinetics and thermodynamics ...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده ادبیات و علوم انسانی 1389

abstract the primary purpose of this study was to explore the actual practices and cognitions of two groups of iranian eap teachers, i.e. language teachers and content teachers, with respect to teaching reading-comprehension and vocabulary. to this end, tehran university of medical sciences which authorizes both groups of teachers to teach eap courses was selected as the context of the study s...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه گیلان 1390

during 2010-2011 a faunistic survey was carried out for collection and identification of edaphic mesostigmatic mites (acari: mesostigmata) in jiroft and suburb. mites were extracted from soil samples by berlese funnel. the mites were cleared in nesbit fluid and were mounted in hoyer medium on microscopic slides. in this study 43 spices from 26 genera and 16 families were collected and identifie...

2007
Feike A. Dijkstra Weixin Cheng

While it is well known that soil moisture directly affects microbial activity and soil organic matter (SOM) decomposition, it is unclear if the presence of plants alters these effects through rhizosphere processes. We studied soil moisture effects on SOM decomposition with and without sunflower and soybean. Plants were grown in two different soil types with soil moisture contents of 45% and 85%...

2010
Margaret E. Lyn Raj Boopathy Debbie Boykin Mark A. Weaver Ryan P. Viator Richard M. Johnson

Harvesting green sugarcane with chopper harvesters results in up to 24 Mg/ha of post-harvest residue. Soil microorganisms can decompose residues and offer numerous ecological and economical benefits to growers; however, the process is dependent on the biotic density, diversity and activity in the soil. Further, the decomposition process is unfavourably slow such that sugar yields are adversely ...

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