نتایج جستجو برای: soil solution

تعداد نتایج: 639736  

2000
Keith W. Goyne Rick L. Day

1979; Barbee and Brown, 1986; Grossmann and Udluft, 1991; Brandi-Dohrn et al., 1996a). The area or zone Soil solution was collected with passive capillary samplers of sampling is unknown and may change with varying (PCAPS) and zero-tension samplers (ZTS) from A horizons of forested soils. The volume and chemistry of collected solutions were moisture conditions or suction applied. In addition, s...

2003
P. J. Vaughan D. L. Suarez

content (Keren et al., 1985). The range of tolerance for both sensitive and tolerant plants to soil solution This work considered the aqueous speciation of B between a soil B concentration is 0.028 to 1.39 mmol L 1. Plants are solution containing B and the tetrahedral surface B species (SH3 BOH 4 during drying of the soil. The aqueous B species were boric not sensitive to adsorbed B. Adsorption...

Journal: :علوم باغبانی ایران 0
فروزان صالحی پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کارشناسی ارشد محسن کافی پردیس کشاورزی و منابع طبیعی دانشگاه تهران، دانشیار مصباح بابالار پردیس کشاورزی و منابع طبیعی دانشگاه تهران، استاد احمد احمدی پردیس کشاورزی و منابع طبیعی دانشگاه تهران، مربی

phosphorus induces flowering and helps seed formation, but there is a big gap between phosphorus supply from natural sources and agriculture and industry demand. in order to investigate phosphorus feeding over long time from iran regions' apatites on rose plants characteristics, var. black magic in zeoponic culture, an experiment was conducted as factorial on the basis of completely random...

Journal: :Journal of environmental quality 2012
Julie Major Marco Rondon Diego Molina Susan J Riha Johannes Lehmann

Nutrient leaching in highly weathered tropical soils often poses a challenge for crop production. We investigated the effects of applying 20 t ha biochar (BC) to a Colombian savanna Oxisol on soil hydrology and nutrient leaching in field experiments. Measurements were made over the third and fourth years after a single BC application. Nutrient contents in the soil solution were measured under o...

Ebadia, Taghi, Mehdinia, Ali, Qazinezhad, Mohammad,

Abstract In this work, removal of phenanthrene and acenaphthene, as a representative of polycyclic aromatic hydrocarbons, was investigated from soil samples by the soil washing remediation method combined with Central Composite Design. Response surface methodology was utilized to investigate the individual and interactive effects of three variables of removal process including surfactant solut...

2012
H. Y. Chang Z. S. Chen

Growing rice on arsenic (As)-contaminated paddy fields may induce high As level grain production. In order to reduce the food contamination risk, the pot experiments containing two As-spiked aging soils and four water managements were conducted to evaluate the effects of water managements on rice As content. The results indicated that As concentration of Erlin soil solution was 10 to 20 times (...

Journal: :Journal of environmental radioactivity 2001
J P Absalom S D Young N M Crout A Sanchez S M Wright E Smolders A F Nisbet A G Gillett

A model predicting plant uptake of radiocaesium based on soil characteristics is described. Three soil parameters required to determine radiocaesium bioavailability in soils are estimated in the model: the labile caesium distribution coefficient (kd1), K+ concentration in the soil solution [mK] and the soil solution-->plant radiocaesium concentration factor (CF, Bq kg-1 plant/Bq dm-3). These we...

2015
Jie Peng Xiang He Hanming Ye João Miguel Dias

The vacuum preloading is an effective method which is widely used in ground treatment. In consolidation analysis, the soil around prefabricated vertical drain (PVD) is traditionally divided into smear zone and undisturbed zone, both with constant permeability. In reality, the permeability of soil changes continuously within the smear zone. In this study, the horizontal permeability coefficient ...

Journal: :Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering 2008
Jae-Woong Jung Seunghwan Lee Hyerim Ryu Ki-Hoon Kang Kyoungphile Nam

Oxidative coupling reaction of phenol mediated by birnessite was studied in aqueous phase and soil. Phenol was readily transformed by birnessite and almost all phenol disappeared in both samples after 24 hours of reaction. Phenol transformation kinetics was investigated by plotting reaction time against logarithm concentrations of residual phenol, revealing that exponential decrease of phenol w...

2011
B. L. TURNER

The extraction of soil organic phosphorus by the NaOH-EDTA procedure was assessed in detail for a tropical forest soil (clay-loam, pH 4.3, total carbon 2.7%). Optimum conditions for the quantification of soil organic phosphorus and characterization of its composition by solution P NMR spectroscopy were extraction in a solution containing 0.25 M NaOH and 50 mM Na2EDTA in a 1:20 solid to solution...

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