نتایج جستجو برای: soil physical quality index

تعداد نتایج: 1841178  

Introduction: Awareness of soil quality in agricultural lands and natural resources is essential to achieve maximum production and environmental sustainability. Although soil quality is not directly assessed, soil quality indicators are widely used today, including the physical indicators which are of great importance in measuring the soil quality, as they directly influence the plant growth an...

Journal: :تحقیقات آب و خاک ایران 0
نوذر قهرمان دانشیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران، کرج پرویز ایران نژاد دانشیار گروه فیزیک فضای مؤسسة ژئوفیزیک دانشگاه تهران رضا نوروز ولاشدی کارشناس ارشد هواشناسی کشاورزی دانشگاه تهران

because of the scarcity of in situ measurements, estimation of soil temperature by other means is very indispensable, as for irrigation management and scheduling when in different field conditions. so far, many regression models have been developed for an estimation of soil temperature, using meteorological data under bare soil. throughout this study, the performance of coup simulation model an...

2006

3.2. Effects on soil health, quality and fertility 3.2.1. Soil organic matter 3.2.2. Biological properties 3.2.3. Chemical properties 3.2.3.1. pH 3.2.3.2. N 3.2.3.3. P 3.2.3.4. K 3.2.3.5. Other elements 3.2.3.6. Electrical conductivity 3.2.3.7 Cation Exchange Capacity 3.2.4. Physical properties 3.2.4.1. Water holding capacity and porosity 3.2.4.2. Bulk density/Penetration resistance 3.2.4.3. Ag...

2015
Jonathan A. Black W. Andy Take

Transparent synthetic soils have been developed as a soil surrogate to enable internal visualization of geotechnical processes in physical models. Transparency of the soil dictates the overarching success of the technique; however, despite this fundamental requirement, no quantitative framework has yet been established to appraise the visual quality of transparent soil. Previous approaches to a...

Journal: :Journal of nematology 2010
Sherri J Morris Richard Conant Nathan Mellor Elizabeth Brewer Eldor A Paul

Soil carbon (C) dynamics and sequestration are controlled by interactions of chemical, physical and biological factors. These factors include biomass quantity and quality, physical environment and the biota. Management can alter these factors in ways that alter C dynamics. We have focused on a range of managed sites with documented land use change from agriculture or grassland to forest. Our re...

2013
Kristine A. Nichols Jonathan J. Halvorson TheCan Caesar-TonThat

Many soil functions depend on the distribution of macro(≥ 0.25 mm) and micro(< 0.25 mm) aggregates and open space between aggregates (i.e. soil structure). Despite the importance of macroaggregates in soil, little is understood about how they form and become stable. We hypothesize that biological activities, chemical reactions, and physical forces which help to form macroaggregates differ from ...

2006
Douglas L. Karlen Eric G. Hurley Susan S. Andrews Cynthia A. Cambardella David W. Meek Michael D. Duffy Antonio P. Mallarino

Do extended crop rotations that include forages improve soil quality and are they profitable? Our objectives were to determine (i) how crop rotation affected soil quality indicators, (ii) if those indicator changes were reflected in soil quality index (SQI) ratings when scored and combined using the Soil Management Assessment Framework, and (iii) how SQI values compared with profitability. Soil...

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