نتایج جستجو برای: calcareous nannofloras

تعداد نتایج: 3483  

Journal: :iran agricultural research 2011
s. safarzadeh a. ronaghi n. karimian

cadmium (cd) concentration in soil solution and its bioavailability is controlled by sorption-desorption reactions. the objective of this research was to compare cd adsorption behavior in six calcareous and four acid soils. soil samples were equilibrated with 0.01 m ca(no3)2 containing 25 to 3200 mg cd l−1. results showed that the tendency for adsorption was high at low cd concentrations (0-400...

Journal: :Shokubutsugaku Zasshi 1960

Journal: :Proceedings of the Royal Society of Medicine 1916

ژورنال: علوم آب و خاک 2002
رضا خراسانی, , غلامحسین حق نیا, ,

The presence of large amounts of calcium in the equilibrium system of calcareous soils of arid and semi-arid regions affects the chemical reactions of soluble and exchangeable phases. Exchange phenomenon is one of these chemical reactions in which calcium plays an important role. K-Ca equilibria are important equilibria in calcareous soils and may be an answer to many problems in soil chemistry...

2015
Narges Milani Ganga M. Hettiarachchi Jason K. Kirby Douglas G. Beak Samuel P. Stacey Mike J. McLaughlin

Zinc oxide (ZnO) nanoparticles may provide a more soluble and plant available source of Zn in Zn fertilizers due to their greater reactivity compared to equivalent micron- or millimetre-sized (bulk) particles. However, the effect of soil on solubility, spatial distribution and speciation of ZnO nanoparticles has not yet been investigated. In this study, we examined the diffusion and solid phase...

2014
Sebastian Hopfenmüller Ingolf Steffan-Dewenter Andrea Holzschuh

Land-use intensification and loss of semi-natural habitats have induced a severe decline of bee diversity in agricultural landscapes. Semi-natural habitats like calcareous grasslands are among the most important bee habitats in central Europe, but they are threatened by decreasing habitat area and quality, and by homogenization of the surrounding landscape affecting both landscape composition a...

Journal: : 2021

Myxomycetes called Plasmodial slime moulds, or true molds are eukaryotic microorganisms. They live in a variety of ecosystems. Genus Didymium Schrad. (family Didymiaceae) is myxomycete taxon containing calcareous peridia (order Physarida) and non-calcareous capillitium. listeri Massee were recorded this study for the first time from Turkey. D. sporocarp was found laboratory by moist chamber cul...

Journal: :تحقیقات آب و خاک ایران 0
نصرت اله نجفی دانشگاه تهران حسن توفیقی دانشکاه تهران

in a greenhouse experiment, changes in inorganic phosphorus fractions as well as their availability in the rhizosphere of rice (oryza sativa c.v. khazar) crop, following an application of 40 mg p (as monocalcium phosphate per kg of soil) were investigated in paddy soils north of iran. the study was performed as a 14×2 factorial in a completely randomized design of two factors namely: soil at 14...

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