Pyrophosphate is themain form of condensedP in the fluid fertilizer ammonium polyphosphate (APP). When APP is applied to soil, pyrophosphate is hydrolyzed to orthophosphate. Hydrolysis of pyrophosphate was investigated in a highly calcareous soil over 3 wk. Changes in P speciation were measured using solid-state P nuclear magnetic resonance (NMR) spectroscopy for dried soil samples and ion chro...

for biostratigraphic studies, based on calcareous nannofossils, a thickness of 480 meters of cretaceous deposits in shushud section (north birjand) has been measured and sampled. the studied section is composed of shale, marl, marine sandstone and sandy limestone. the shale and marl units were more suitable for sampling. according to taxonomical studies, 10 genera and 25 species in shushud sect...

The aim of this study is to determine the qualitative variability and relative presence sesquiterpene hydrocarbons in essential oils samples Teucrium montanum L. collected from two different substrate types. Four serpentinite four calcareous were obtained by method hydrodistillation aboveground plant parts. Based on results, it was shown that populations habitats synthesize 2 times more sesquit...

Improving Soil Texture Digital Mapping Using Landsat 8 Satellite Imageries in Calcareous Soils of Southern Iran